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seccomp updates for v5.9-rc1

Browse Source 
- Improved selftest coverage, timeouts, and reporting
 - Add EPOLLHUP support for SECCOMP_RET_USER_NOTIF (Christian Brauner)
 - Refactor __scm_install_fd() into __receive_fd() and fix buggy callers
 - Introduce "addfd" command for SECCOMP_RET_USER_NOTIF (Sargun Dhillon)
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Merge tag 'seccomp-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull seccomp updates from Kees Cook:
 "There are a bunch of clean ups and selftest improvements along with
  two major updates to the SECCOMP_RET_USER_NOTIF filter return:
  EPOLLHUP support to more easily detect the death of a monitored
  process, and being able to inject fds when intercepting syscalls that
  expect an fd-opening side-effect (needed by both container folks and
  Chrome). The latter continued the refactoring of __scm_install_fd()
  started by Christoph, and in the process found and fixed a handful of
  bugs in various callers.

   - Improved selftest coverage, timeouts, and reporting

   - Add EPOLLHUP support for SECCOMP_RET_USER_NOTIF (Christian Brauner)

   - Refactor __scm_install_fd() into __receive_fd() and fix buggy
     callers

   - Introduce 'addfd' command for SECCOMP_RET_USER_NOTIF (Sargun
     Dhillon)"

* tag 'seccomp-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (30 commits)
  selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD
  seccomp: Introduce addfd ioctl to seccomp user notifier
  fs: Expand __receive_fd() to accept existing fd
  pidfd: Replace open-coded receive_fd()
  fs: Add receive_fd() wrapper for __receive_fd()
  fs: Move __scm_install_fd() to __receive_fd()
  net/scm: Regularize compat handling of scm_detach_fds()
  pidfd: Add missing sock updates for pidfd_getfd()
  net/compat: Add missing sock updates for SCM_RIGHTS
  selftests/seccomp: Check ENOSYS under tracing
  selftests/seccomp: Refactor to use fixture variants
  selftests/harness: Clean up kern-doc for fixtures
  seccomp: Use -1 marker for end of mode 1 syscall list
  seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID
  selftests/seccomp: Rename user_trap_syscall() to user_notif_syscall()
  selftests/seccomp: Make kcmp() less required
  seccomp: Use pr_fmt
  selftests/seccomp: Improve calibration loop
  selftests/seccomp: use 90s as timeout
  selftests/seccomp: Expand benchmark to per-filter measurements
  ...
This commit is contained in:
Linus Torvalds 2020-08-04 14:11:08 -07:00
commit 9ecc6ea491
21 changed files with 1060 additions and 391 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/mips/include/asm/seccomp.h
View File

@ -9,12 +9,12 @@ static inline const int *get_compat_mode1_syscalls(void)
static const int syscalls_O32[] = {
__NR_O32_Linux + 3, __NR_O32_Linux + 4,
__NR_O32_Linux + 1, __NR_O32_Linux + 193,
0, /* null terminated */
-1, /* negative terminated */
};
static const int syscalls_N32[] = {
__NR_N32_Linux + 0, __NR_N32_Linux + 1,
__NR_N32_Linux + 58, __NR_N32_Linux + 211,
0, /* null terminated */
-1, /* negative terminated */
};
if (IS_ENABLED(CONFIG_MIPS32_O32) && test_thread_flag(TIF_32BIT_REGS))

61
fs/file.c
View File

@ -18,6 +18,7 @@
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <net/sock.h>
unsigned int sysctl_nr_open __read_mostly = 1024*1024;
unsigned int sysctl_nr_open_min = BITS_PER_LONG;
@ -613,6 +614,10 @@ void __fd_install(struct files_struct *files, unsigned int fd,
rcu_read_unlock_sched();
}
/*
* This consumes the "file" refcount, so callers should treat it
* as if they had called fput(file).
*/
void fd_install(unsigned int fd, struct file *file)
{
__fd_install(current->files, fd, file);
@ -931,6 +936,62 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
return err;
}
/**
* __receive_fd() - Install received file into file descriptor table
*
* @fd: fd to install into (if negative, a new fd will be allocated)
* @file: struct file that was received from another process
* @ufd: __user pointer to write new fd number to
* @o_flags: the O_* flags to apply to the new fd entry
*
* Installs a received file into the file descriptor table, with appropriate
* checks and count updates. Optionally writes the fd number to userspace, if
* @ufd is non-NULL.
*
* This helper handles its own reference counting of the incoming
* struct file.
*
* Returns newly install fd or -ve on error.
*/
int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flags)
{
int new_fd;
int error;
error = security_file_receive(file);
if (error)
return error;
if (fd < 0) {
new_fd = get_unused_fd_flags(o_flags);
if (new_fd < 0)
return new_fd;
} else {
new_fd = fd;
}
if (ufd) {
error = put_user(new_fd, ufd);
if (error) {
if (fd < 0)
put_unused_fd(new_fd);
return error;
}
}
if (fd < 0) {
fd_install(new_fd, get_file(file));
} else {
error = replace_fd(new_fd, file, o_flags);
if (error)
return error;
}
/* Bump the sock usage counts, if any. */
__receive_sock(file);
return new_fd;
}
static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
{
int err = -EBADF;

2
fs/proc/array.c
View File

@ -341,6 +341,8 @@ static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
#ifdef CONFIG_SECCOMP
seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
atomic_read(&p->seccomp.filter_count));
#endif
seq_puts(m, "\nSpeculation_Store_Bypass:\t");
switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {

2
include/asm-generic/seccomp.h
View File

@ -33,7 +33,7 @@ static inline const int *get_compat_mode1_syscalls(void)
static const int mode1_syscalls_32[] = {
__NR_seccomp_read_32, __NR_seccomp_write_32,
__NR_seccomp_exit_32, __NR_seccomp_sigreturn_32,
0, /* null terminated */
-1, /* negative terminated */
};
return mode1_syscalls_32;
}

19
include/linux/file.h
View File

@ -9,6 +9,7 @@
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/posix_types.h>
#include <linux/errno.h>
struct file;
@ -91,6 +92,24 @@ extern void put_unused_fd(unsigned int fd);
extern void fd_install(unsigned int fd, struct file *file);
extern int __receive_fd(int fd, struct file *file, int __user *ufd,
unsigned int o_flags);
static inline int receive_fd_user(struct file *file, int __user *ufd,
unsigned int o_flags)
{
if (ufd == NULL)
return -EFAULT;
return __receive_fd(-1, file, ufd, o_flags);
}
static inline int receive_fd(struct file *file, unsigned int o_flags)
{
return __receive_fd(-1, file, NULL, o_flags);
}
static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
{
return __receive_fd(fd, file, NULL, o_flags);
}
extern void flush_delayed_fput(void);
extern void __fput_sync(struct file *);

10
include/linux/seccomp.h
View File

@ -10,9 +10,14 @@
SECCOMP_FILTER_FLAG_NEW_LISTENER | \
SECCOMP_FILTER_FLAG_TSYNC_ESRCH)
/* sizeof() the first published struct seccomp_notif_addfd */
#define SECCOMP_NOTIFY_ADDFD_SIZE_VER0 24
#define SECCOMP_NOTIFY_ADDFD_SIZE_LATEST SECCOMP_NOTIFY_ADDFD_SIZE_VER0
#ifdef CONFIG_SECCOMP
#include <linux/thread_info.h>
#include <linux/atomic.h>
#include <asm/seccomp.h>
struct seccomp_filter;
@ -29,6 +34,7 @@ struct seccomp_filter;
*/
struct seccomp {
int mode;
atomic_t filter_count;
struct seccomp_filter *filter;
};
@ -82,10 +88,10 @@ static inline int seccomp_mode(struct seccomp *s)
#endif /* CONFIG_SECCOMP */
#ifdef CONFIG_SECCOMP_FILTER
extern void put_seccomp_filter(struct task_struct *tsk);
extern void seccomp_filter_release(struct task_struct *tsk);
extern void get_seccomp_filter(struct task_struct *tsk);
#else /* CONFIG_SECCOMP_FILTER */
static inline void put_seccomp_filter(struct task_struct *tsk)
static inline void seccomp_filter_release(struct task_struct *tsk)
{
return;
}

4
include/net/sock.h
View File

@ -891,6 +891,8 @@ static inline int sk_memalloc_socks(void)
{
return static_branch_unlikely(&memalloc_socks_key);
}
void __receive_sock(struct file *file);
#else
static inline int sk_memalloc_socks(void)
@ -898,6 +900,8 @@ static inline int sk_memalloc_socks(void)
return 0;
}
static inline void __receive_sock(struct file *file)
{ }
#endif
static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)

25
include/uapi/linux/seccomp.h
View File

@ -113,6 +113,25 @@ struct seccomp_notif_resp {
__u32 flags;
};
/* valid flags for seccomp_notif_addfd */
#define SECCOMP_ADDFD_FLAG_SETFD (1UL << 0) /* Specify remote fd */
/**
* struct seccomp_notif_addfd
* @id: The ID of the seccomp notification
* @flags: SECCOMP_ADDFD_FLAG_*
* @srcfd: The local fd number
* @newfd: Optional remote FD number if SETFD option is set, otherwise 0.
* @newfd_flags: The O_* flags the remote FD should have applied
*/
struct seccomp_notif_addfd {
__u64 id;
__u32 flags;
__u32 srcfd;
__u32 newfd;
__u32 newfd_flags;
};
#define SECCOMP_IOC_MAGIC '!'
#define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
#define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
@ -123,5 +142,9 @@ struct seccomp_notif_resp {
#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
struct seccomp_notif_resp)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64)
/* On success, the return value is the remote process's added fd number */
#define SECCOMP_IOCTL_NOTIF_ADDFD SECCOMP_IOW(3, \
struct seccomp_notif_addfd)
#endif /* _UAPI_LINUX_SECCOMP_H */

3
init/init_task.c
View File

@ -204,6 +204,9 @@ struct task_struct init_task
#ifdef CONFIG_SECURITY
.security = NULL,
#endif
#ifdef CONFIG_SECCOMP
.seccomp = { .filter_count = ATOMIC_INIT(0) },
#endif
};
EXPORT_SYMBOL(init_task);

1
kernel/exit.c
View File

@ -217,6 +217,7 @@ void release_task(struct task_struct *p)
}
write_unlock_irq(&tasklist_lock);
seccomp_filter_release(p);
proc_flush_pid(thread_pid);
put_pid(thread_pid);
release_thread(p);

1
kernel/fork.c
View File

@ -479,7 +479,6 @@ void free_task(struct task_struct *tsk)
#endif
rt_mutex_debug_task_free(tsk);
ftrace_graph_exit_task(tsk);
put_seccomp_filter(tsk);
arch_release_task_struct(tsk);
if (tsk->flags & PF_KTHREAD)
free_kthread_struct(tsk);

14
kernel/pid.c
View File

@ -42,6 +42,7 @@
#include <linux/sched/signal.h>
#include <linux/sched/task.h>
#include <linux/idr.h>
#include <net/sock.h>
struct pid init_struct_pid = {
.count = REFCOUNT_INIT(1),
@ -635,17 +636,8 @@ static int pidfd_getfd(struct pid *pid, int fd)
if (IS_ERR(file))
return PTR_ERR(file);
ret = security_file_receive(file);
if (ret) {
fput(file);
return ret;
}
ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0)
fput(file);
else
fd_install(ret, file);
ret = receive_fd(file, O_CLOEXEC);
fput(file);
return ret;
}

376
kernel/seccomp.c
View File

@ -13,6 +13,7 @@
* Mode 2 allows user-defined system call filters in the form
* of Berkeley Packet Filters/Linux Socket Filters.
*/
#define pr_fmt(fmt) "seccomp: " fmt
#include <linux/refcount.h>
#include <linux/audit.h>
@ -41,6 +42,15 @@
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <linux/anon_inodes.h>
#include <linux/lockdep.h>
/*
* When SECCOMP_IOCTL_NOTIF_ID_VALID was first introduced, it had the
* wrong direction flag in the ioctl number. This is the broken one,
* which the kernel needs to keep supporting until all userspaces stop
* using the wrong command number.
*/
#define SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR SECCOMP_IOR(2, __u64)
enum notify_state {
SECCOMP_NOTIFY_INIT,
@ -77,10 +87,42 @@ struct seccomp_knotif {
long val;
u32 flags;
/* Signals when this has entered SECCOMP_NOTIFY_REPLIED */
/*
* Signals when this has changed states, such as the listener
* dying, a new seccomp addfd message, or changing to REPLIED
*/
struct completion ready;
struct list_head list;
/* outstanding addfd requests */
struct list_head addfd;
};
/**
* struct seccomp_kaddfd - container for seccomp_addfd ioctl messages
*
* @file: A reference to the file to install in the other task
* @fd: The fd number to install it at. If the fd number is -1, it means the
* installing process should allocate the fd as normal.
* @flags: The flags for the new file descriptor. At the moment, only O_CLOEXEC
* is allowed.
* @ret: The return value of the installing process. It is set to the fd num
* upon success (>= 0).
* @completion: Indicates that the installing process has completed fd
* installation, or gone away (either due to successful
* reply, or signal)
*
*/
struct seccomp_kaddfd {
struct file *file;
int fd;
unsigned int flags;
/* To only be set on reply */
int ret;
struct completion completion;
struct list_head list;
};
/**
@ -94,27 +136,35 @@ struct seccomp_knotif {
* filter->notify_lock.
* @next_id: The id of the next request.
* @notifications: A list of struct seccomp_knotif elements.
* @wqh: A wait queue for poll.
*/
struct notification {
struct semaphore request;
u64 next_id;
struct list_head notifications;
wait_queue_head_t wqh;
};
/**
* struct seccomp_filter - container for seccomp BPF programs
*
* @usage: reference count to manage the object lifetime.
* get/put helpers should be used when accessing an instance
* outside of a lifetime-guarded section. In general, this
* is only needed for handling filters shared across tasks.
* @refs: Reference count to manage the object lifetime.
* A filter's reference count is incremented for each directly
* attached task, once for the dependent filter, and if
* requested for the user notifier. When @refs reaches zero,
* the filter can be freed.
* @users: A filter's @users count is incremented for each directly
* attached task (filter installation, fork(), thread_sync),
* and once for the dependent filter (tracked in filter->prev).
* When it reaches zero it indicates that no direct or indirect
* users of that filter exist. No new tasks can get associated with
* this filter after reaching 0. The @users count is always smaller
* or equal to @refs. Hence, reaching 0 for @users does not mean
* the filter can be freed.
* @log: true if all actions except for SECCOMP_RET_ALLOW should be logged
* @prev: points to a previously installed, or inherited, filter
* @prog: the BPF program to evaluate
* @notif: the struct that holds all notification related information
* @notify_lock: A lock for all notification-related accesses.
* @wqh: A wait queue for poll if a notifier is in use.
*
* seccomp_filter objects are organized in a tree linked via the @prev
* pointer. For any task, it appears to be a singly-linked list starting
@ -124,15 +174,17 @@ struct notification {
* how namespaces work.
*
* seccomp_filter objects should never be modified after being attached
* to a task_struct (other than @usage).
* to a task_struct (other than @refs).
*/
struct seccomp_filter {
refcount_t usage;
refcount_t refs;
refcount_t users;
bool log;
struct seccomp_filter *prev;
struct bpf_prog *prog;
struct notification *notif;
struct mutex notify_lock;
wait_queue_head_t wqh;
};
/* Limit any path through the tree to 256KB worth of instructions. */
@ -366,6 +418,59 @@ static inline pid_t seccomp_can_sync_threads(void)
return 0;
}
static inline void seccomp_filter_free(struct seccomp_filter *filter)
{
if (filter) {
bpf_prog_destroy(filter->prog);
kfree(filter);
}
}
static void __seccomp_filter_orphan(struct seccomp_filter *orig)
{
while (orig && refcount_dec_and_test(&orig->users)) {
if (waitqueue_active(&orig->wqh))
wake_up_poll(&orig->wqh, EPOLLHUP);
orig = orig->prev;
}
}
static void __put_seccomp_filter(struct seccomp_filter *orig)
{
/* Clean up single-reference branches iteratively. */
while (orig && refcount_dec_and_test(&orig->refs)) {
struct seccomp_filter *freeme = orig;
orig = orig->prev;
seccomp_filter_free(freeme);
}
}
static void __seccomp_filter_release(struct seccomp_filter *orig)
{
/* Notify about any unused filters in the task's former filter tree. */
__seccomp_filter_orphan(orig);
/* Finally drop all references to the task's former tree. */
__put_seccomp_filter(orig);
}
/**
* seccomp_filter_release - Detach the task from its filter tree,
* drop its reference count, and notify
* about unused filters
*
* This function should only be called when the task is exiting as
* it detaches it from its filter tree. As such, READ_ONCE() and
* barriers are not needed here, as would normally be needed.
*/
void seccomp_filter_release(struct task_struct *tsk)
{
struct seccomp_filter *orig = tsk->seccomp.filter;
/* Detach task from its filter tree. */
tsk->seccomp.filter = NULL;
__seccomp_filter_release(orig);
}
/**
* seccomp_sync_threads: sets all threads to use current's filter
*
@ -390,14 +495,19 @@ static inline void seccomp_sync_threads(unsigned long flags)
/* Get a task reference for the new leaf node. */
get_seccomp_filter(caller);
/*
* Drop the task reference to the shared ancestor since
* current's path will hold a reference. (This also
* allows a put before the assignment.)
*/
put_seccomp_filter(thread);
__seccomp_filter_release(thread->seccomp.filter);
/* Make our new filter tree visible. */
smp_store_release(&thread->seccomp.filter,
caller->seccomp.filter);
atomic_set(&thread->seccomp.filter_count,
atomic_read(&thread->seccomp.filter_count));
/*
* Don't let an unprivileged task work around
@ -461,7 +571,9 @@ static struct seccomp_filter *seccomp_prepare_filter(struct sock_fprog *fprog)
return ERR_PTR(ret);
}
refcount_set(&sfilter->usage, 1);
refcount_set(&sfilter->refs, 1);
refcount_set(&sfilter->users, 1);
init_waitqueue_head(&sfilter->wqh);
return sfilter;
}
@ -544,6 +656,7 @@ static long seccomp_attach_filter(unsigned int flags,
*/
filter->prev = current->seccomp.filter;
current->seccomp.filter = filter;
atomic_inc(&current->seccomp.filter_count);
/* Now that the new filter is in place, synchronize to all threads. */
if (flags & SECCOMP_FILTER_FLAG_TSYNC)
@ -554,7 +667,7 @@ static long seccomp_attach_filter(unsigned int flags,
static void __get_seccomp_filter(struct seccomp_filter *filter)
{
refcount_inc(&filter->usage);
refcount_inc(&filter->refs);
}
/* get_seccomp_filter - increments the reference count of the filter on @tsk */
@ -564,30 +677,7 @@ void get_seccomp_filter(struct task_struct *tsk)
if (!orig)
return;
__get_seccomp_filter(orig);
}
static inline void seccomp_filter_free(struct seccomp_filter *filter)
{
if (filter) {
bpf_prog_destroy(filter->prog);
kfree(filter);
}
}
static void __put_seccomp_filter(struct seccomp_filter *orig)
{
/* Clean up single-reference branches iteratively. */
while (orig && refcount_dec_and_test(&orig->usage)) {
struct seccomp_filter *freeme = orig;
orig = orig->prev;
seccomp_filter_free(freeme);
}
}
/* put_seccomp_filter - decrements the ref count of tsk->seccomp.filter */
void put_seccomp_filter(struct task_struct *tsk)
{
__put_seccomp_filter(tsk->seccomp.filter);
refcount_inc(&orig->users);
}
static void seccomp_init_siginfo(kernel_siginfo_t *info, int syscall, int reason)
@ -684,20 +774,20 @@ static inline void seccomp_log(unsigned long syscall, long signr, u32 action,
*/
static const int mode1_syscalls[] = {
__NR_seccomp_read, __NR_seccomp_write, __NR_seccomp_exit, __NR_seccomp_sigreturn,
0, /* null terminated */
-1, /* negative terminated */
};
static void __secure_computing_strict(int this_syscall)
{
const int *syscall_whitelist = mode1_syscalls;
const int *allowed_syscalls = mode1_syscalls;
#ifdef CONFIG_COMPAT
if (in_compat_syscall())
syscall_whitelist = get_compat_mode1_syscalls();
allowed_syscalls = get_compat_mode1_syscalls();
#endif
do {
if (*syscall_whitelist == this_syscall)
if (*allowed_syscalls == this_syscall)
return;
} while (*++syscall_whitelist);
} while (*++allowed_syscalls != -1);
#ifdef SECCOMP_DEBUG
dump_stack();
@ -735,6 +825,17 @@ static u64 seccomp_next_notify_id(struct seccomp_filter *filter)
return filter->notif->next_id++;
}
static void seccomp_handle_addfd(struct seccomp_kaddfd *addfd)
{
/*
* Remove the notification, and reset the list pointers, indicating
* that it has been handled.
*/
list_del_init(&addfd->list);
addfd->ret = receive_fd_replace(addfd->fd, addfd->file, addfd->flags);
complete(&addfd->completion);
}
static int seccomp_do_user_notification(int this_syscall,
struct seccomp_filter *match,
const struct seccomp_data *sd)
@ -743,6 +844,7 @@ static int seccomp_do_user_notification(int this_syscall,
u32 flags = 0;
long ret = 0;
struct seccomp_knotif n = {};
struct seccomp_kaddfd *addfd, *tmp;
mutex_lock(&match->notify_lock);
err = -ENOSYS;
@ -755,25 +857,43 @@ static int seccomp_do_user_notification(int this_syscall,
n.id = seccomp_next_notify_id(match);
init_completion(&n.ready);
list_add(&n.list, &match->notif->notifications);
INIT_LIST_HEAD(&n.addfd);
up(&match->notif->request);
wake_up_poll(&match->notif->wqh, EPOLLIN | EPOLLRDNORM);
wake_up_poll(&match->wqh, EPOLLIN | EPOLLRDNORM);
mutex_unlock(&match->notify_lock);
/*
* This is where we wait for a reply from userspace.
*/
wait:
err = wait_for_completion_interruptible(&n.ready);
mutex_lock(&match->notify_lock);
if (err == 0) {
/* Check if we were woken up by a addfd message */
addfd = list_first_entry_or_null(&n.addfd,
struct seccomp_kaddfd, list);
if (addfd && n.state != SECCOMP_NOTIFY_REPLIED) {
seccomp_handle_addfd(addfd);
mutex_unlock(&match->notify_lock);
goto wait;
}
ret = n.val;
err = n.error;
flags = n.flags;
}
/* If there were any pending addfd calls, clear them out */
list_for_each_entry_safe(addfd, tmp, &n.addfd, list) {
/* The process went away before we got a chance to handle it */
addfd->ret = -ESRCH;
list_del_init(&addfd->list);
complete(&addfd->completion);
}
/*
* Note that it's possible the listener died in between the time when
* we were notified of a respons (or a signal) and when we were able to
* we were notified of a response (or a signal) and when we were able to
* re-acquire the lock, so only delete from the list if the
* notification actually exists.
*
@ -1011,6 +1131,11 @@ static int seccomp_notify_release(struct inode *inode, struct file *file)
knotif->error = -ENOSYS;
knotif->val = 0;
/*
* We do not need to wake up any pending addfd messages, as
* the notifier will do that for us, as this just looks
* like a standard reply.
*/
complete(&knotif->ready);
}
@ -1021,6 +1146,23 @@ static int seccomp_notify_release(struct inode *inode, struct file *file)
return 0;
}
/* must be called with notif_lock held */
static inline struct seccomp_knotif *
find_notification(struct seccomp_filter *filter, u64 id)
{
struct seccomp_knotif *cur;
lockdep_assert_held(&filter->notify_lock);
list_for_each_entry(cur, &filter->notif->notifications, list) {
if (cur->id == id)
return cur;
}
return NULL;
}
static long seccomp_notify_recv(struct seccomp_filter *filter,
void __user *buf)
{
@ -1064,7 +1206,7 @@ static long seccomp_notify_recv(struct seccomp_filter *filter,
unotif.data = *(knotif->data);
knotif->state = SECCOMP_NOTIFY_SENT;
wake_up_poll(&filter->notif->wqh, EPOLLOUT | EPOLLWRNORM);
wake_up_poll(&filter->wqh, EPOLLOUT | EPOLLWRNORM);
ret = 0;
out:
mutex_unlock(&filter->notify_lock);
@ -1078,15 +1220,8 @@ static long seccomp_notify_recv(struct seccomp_filter *filter,
* may have died when we released the lock, so we need to make
* sure it's still around.
*/
knotif = NULL;
mutex_lock(&filter->notify_lock);
list_for_each_entry(cur, &filter->notif->notifications, list) {
if (cur->id == unotif.id) {
knotif = cur;
break;
}
}
knotif = find_notification(filter, unotif.id);
if (knotif) {
knotif->state = SECCOMP_NOTIFY_INIT;
up(&filter->notif->request);
@ -1101,7 +1236,7 @@ static long seccomp_notify_send(struct seccomp_filter *filter,
void __user *buf)
{
struct seccomp_notif_resp resp = {};
struct seccomp_knotif *knotif = NULL, *cur;
struct seccomp_knotif *knotif;
long ret;
if (copy_from_user(&resp, buf, sizeof(resp)))
@ -1118,13 +1253,7 @@ static long seccomp_notify_send(struct seccomp_filter *filter,
if (ret < 0)
return ret;
list_for_each_entry(cur, &filter->notif->notifications, list) {
if (cur->id == resp.id) {
knotif = cur;
break;
}
}
knotif = find_notification(filter, resp.id);
if (!knotif) {
ret = -ENOENT;
goto out;
@ -1150,7 +1279,7 @@ static long seccomp_notify_send(struct seccomp_filter *filter,
static long seccomp_notify_id_valid(struct seccomp_filter *filter,
void __user *buf)
{
struct seccomp_knotif *knotif = NULL;
struct seccomp_knotif *knotif;
u64 id;
long ret;
@ -1161,17 +1290,109 @@ static long seccomp_notify_id_valid(struct seccomp_filter *filter,
if (ret < 0)
return ret;
ret = -ENOENT;
list_for_each_entry(knotif, &filter->notif->notifications, list) {
if (knotif->id == id) {
if (knotif->state == SECCOMP_NOTIFY_SENT)
ret = 0;
goto out;
}
knotif = find_notification(filter, id);
if (knotif && knotif->state == SECCOMP_NOTIFY_SENT)
ret = 0;
else
ret = -ENOENT;
mutex_unlock(&filter->notify_lock);
return ret;
}
static long seccomp_notify_addfd(struct seccomp_filter *filter,
struct seccomp_notif_addfd __user *uaddfd,
unsigned int size)
{
struct seccomp_notif_addfd addfd;
struct seccomp_knotif *knotif;
struct seccomp_kaddfd kaddfd;
int ret;
BUILD_BUG_ON(sizeof(addfd) < SECCOMP_NOTIFY_ADDFD_SIZE_VER0);
BUILD_BUG_ON(sizeof(addfd) != SECCOMP_NOTIFY_ADDFD_SIZE_LATEST);
if (size < SECCOMP_NOTIFY_ADDFD_SIZE_VER0 || size >= PAGE_SIZE)
return -EINVAL;
ret = copy_struct_from_user(&addfd, sizeof(addfd), uaddfd, size);
if (ret)
return ret;
if (addfd.newfd_flags & ~O_CLOEXEC)
return -EINVAL;
if (addfd.flags & ~SECCOMP_ADDFD_FLAG_SETFD)
return -EINVAL;
if (addfd.newfd && !(addfd.flags & SECCOMP_ADDFD_FLAG_SETFD))
return -EINVAL;
kaddfd.file = fget(addfd.srcfd);
if (!kaddfd.file)
return -EBADF;
kaddfd.flags = addfd.newfd_flags;
kaddfd.fd = (addfd.flags & SECCOMP_ADDFD_FLAG_SETFD) ?
addfd.newfd : -1;
init_completion(&kaddfd.completion);
ret = mutex_lock_interruptible(&filter->notify_lock);
if (ret < 0)
goto out;
knotif = find_notification(filter, addfd.id);
if (!knotif) {
ret = -ENOENT;
goto out_unlock;
}
out:
/*
* We do not want to allow for FD injection to occur before the
* notification has been picked up by a userspace handler, or after
* the notification has been replied to.
*/
if (knotif->state != SECCOMP_NOTIFY_SENT) {
ret = -EINPROGRESS;
goto out_unlock;
}
list_add(&kaddfd.list, &knotif->addfd);
complete(&knotif->ready);
mutex_unlock(&filter->notify_lock);
/* Now we wait for it to be processed or be interrupted */
ret = wait_for_completion_interruptible(&kaddfd.completion);
if (ret == 0) {
/*
* We had a successful completion. The other side has already
* removed us from the addfd queue, and
* wait_for_completion_interruptible has a memory barrier upon
* success that lets us read this value directly without
* locking.
*/
ret = kaddfd.ret;
goto out;
}
mutex_lock(&filter->notify_lock);
/*
* Even though we were woken up by a signal and not a successful
* completion, a completion may have happened in the mean time.
*
* We need to check again if the addfd request has been handled,
* and if not, we will remove it from the queue.
*/
if (list_empty(&kaddfd.list))
ret = kaddfd.ret;
else
list_del(&kaddfd.list);
out_unlock:
mutex_unlock(&filter->notify_lock);
out:
fput(kaddfd.file);
return ret;
}
@ -1181,13 +1402,22 @@ static long seccomp_notify_ioctl(struct file *file, unsigned int cmd,
struct seccomp_filter *filter = file->private_data;
void __user *buf = (void __user *)arg;
/* Fixed-size ioctls */
switch (cmd) {
case SECCOMP_IOCTL_NOTIF_RECV:
return seccomp_notify_recv(filter, buf);
case SECCOMP_IOCTL_NOTIF_SEND:
return seccomp_notify_send(filter, buf);
case SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR:
case SECCOMP_IOCTL_NOTIF_ID_VALID:
return seccomp_notify_id_valid(filter, buf);
}
/* Extensible Argument ioctls */
#define EA_IOCTL(cmd) ((cmd) & ~(IOC_INOUT | IOCSIZE_MASK))
switch (EA_IOCTL(cmd)) {
case EA_IOCTL(SECCOMP_IOCTL_NOTIF_ADDFD):
return seccomp_notify_addfd(filter, buf, _IOC_SIZE(cmd));
default:
return -EINVAL;
}
@ -1200,7 +1430,7 @@ static __poll_t seccomp_notify_poll(struct file *file,
__poll_t ret = 0;
struct seccomp_knotif *cur;
poll_wait(file, &filter->notif->wqh, poll_tab);
poll_wait(file, &filter->wqh, poll_tab);
if (mutex_lock_interruptible(&filter->notify_lock) < 0)
return EPOLLERR;
@ -1216,6 +1446,9 @@ static __poll_t seccomp_notify_poll(struct file *file,
mutex_unlock(&filter->notify_lock);
if (refcount_read(&filter->users) == 0)
ret |= EPOLLHUP;
return ret;
}
@ -1244,7 +1477,6 @@ static struct file *init_listener(struct seccomp_filter *filter)
sema_init(&filter->notif->request, 0);
filter->notif->next_id = get_random_u64();
INIT_LIST_HEAD(&filter->notif->notifications);
init_waitqueue_head(&filter->notif->wqh);
ret = anon_inode_getfile("seccomp notify", &seccomp_notify_ops,
filter, O_RDWR);
@ -1822,7 +2054,7 @@ static int __init seccomp_sysctl_init(void)
hdr = register_sysctl_paths(seccomp_sysctl_path, seccomp_sysctl_table);
if (!hdr)
pr_warn("seccomp: sysctl registration failed\n");
pr_warn("sysctl registration failed\n");
else
kmemleak_not_leak(hdr);

55
net/compat.c
View File

@ -281,39 +281,31 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat
return 0;
}
void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
static int scm_max_fds_compat(struct msghdr *msg)
{
struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
int fdnum = scm->fp->count;
struct file **fp = scm->fp->fp;
int __user *cmfptr;
if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
return 0;
return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
}
void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
{
struct compat_cmsghdr __user *cm =
(struct compat_cmsghdr __user *)msg->msg_control;
unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
int __user *cmsg_data = CMSG_USER_DATA(cm);
int err = 0, i;
if (fdnum < fdmax)
fdmax = fdnum;
for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
int new_fd;
err = security_file_receive(fp[i]);
if (err)
break;
err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
? O_CLOEXEC : 0);
for (i = 0; i < fdmax; i++) {
err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
if (err < 0)
break;
new_fd = err;
err = put_user(new_fd, cmfptr);
if (err) {
put_unused_fd(new_fd);
break;
}
/* Bump the usage count and install the file. */
fd_install(new_fd, get_file(fp[i]));
}
if (i > 0) {
int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
err = put_user(SOL_SOCKET, &cm->cmsg_level);
if (!err)
err = put_user(SCM_RIGHTS, &cm->cmsg_type);
@ -321,16 +313,19 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
err = put_user(cmlen, &cm->cmsg_len);
if (!err) {
cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
kmsg->msg_control += cmlen;
kmsg->msg_controllen -= cmlen;
if (msg->msg_controllen < cmlen)
cmlen = msg->msg_controllen;
msg->msg_control += cmlen;
msg->msg_controllen -= cmlen;
}
}
if (i < fdnum)
kmsg->msg_flags |= MSG_CTRUNC;
if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
msg->msg_flags |= MSG_CTRUNC;
/*
* All of the files that fit in the message have had their
* usage counts incremented, so we just free the list.
* All of the files that fit in the message have had their usage counts
* incremented, so we just free the list.
*/
__scm_destroy(scm);
}

50
net/core/scm.c
View File

@ -280,36 +280,6 @@ void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_inter
}
EXPORT_SYMBOL(put_cmsg_scm_timestamping);
static int __scm_install_fd(struct file *file, int __user *ufd, int o_flags)
{
struct socket *sock;
int new_fd;
int error;
error = security_file_receive(file);
if (error)
return error;
new_fd = get_unused_fd_flags(o_flags);
if (new_fd < 0)
return new_fd;
error = put_user(new_fd, ufd);
if (error) {
put_unused_fd(new_fd);
return error;
}
/* Bump the usage count and install the file. */
sock = sock_from_file(file, &error);
if (sock) {
sock_update_netprioidx(&sock->sk->sk_cgrp_data);
sock_update_classid(&sock->sk->sk_cgrp_data);
}
fd_install(new_fd, get_file(file));
return 0;
}
static int scm_max_fds(struct msghdr *msg)
{
if (msg->msg_controllen <= sizeof(struct cmsghdr))
@ -319,29 +289,29 @@ static int scm_max_fds(struct msghdr *msg)
void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
{
struct cmsghdr __user *cm
= (__force struct cmsghdr __user*)msg->msg_control;
int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
struct cmsghdr __user *cm =
(__force struct cmsghdr __user *)msg->msg_control;
unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
int fdmax = min_t(int, scm_max_fds(msg), scm->fp->count);
int __user *cmsg_data = CMSG_USER_DATA(cm);
int err = 0, i;
/* no use for FD passing from kernel space callers */
if (WARN_ON_ONCE(!msg->msg_control_is_user))
return;
if (msg->msg_flags & MSG_CMSG_COMPAT) {
scm_detach_fds_compat(msg, scm);
return;
}
/* no use for FD passing from kernel space callers */
if (WARN_ON_ONCE(!msg->msg_control_is_user))
return;
for (i = 0; i < fdmax; i++) {
err = __scm_install_fd(scm->fp->fp[i], cmsg_data + i, o_flags);
if (err)
err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
if (err < 0)
break;
}
if (i > 0) {
if (i > 0) {
int cmlen = CMSG_LEN(i * sizeof(int));
err = put_user(SOL_SOCKET, &cm->cmsg_level);

21
net/core/sock.c
View File

@ -2842,6 +2842,27 @@ int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *
}
EXPORT_SYMBOL(sock_no_mmap);
/*
* When a file is received (via SCM_RIGHTS, etc), we must bump the
* various sock-based usage counts.
*/
void __receive_sock(struct file *file)
{
struct socket *sock;
int error;
/*
* The resulting value of "error" is ignored here since we only
* need to take action when the file is a socket and testing
* "sock" for NULL is sufficient.
*/
sock = sock_from_file(file, &error);
if (sock) {
sock_update_netprioidx(&sock->sk->sk_cgrp_data);
sock_update_classid(&sock->sk->sk_cgrp_data);
}
}
ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
{
ssize_t res;

15
tools/testing/selftests/kselftest_harness.h
View File

@ -195,8 +195,9 @@
*
* .. code-block:: c
*
* FIXTURE_DATA(datatype name)
* FIXTURE_DATA(datatype_name)
*
* Almost always, you want just FIXTURE() instead (see below).
* This call may be used when the type of the fixture data
* is needed. In general, this should not be needed unless
* the *self* is being passed to a helper directly.
@ -211,7 +212,7 @@
*
* .. code-block:: c
*
* FIXTURE(datatype name) {
* FIXTURE(fixture_name) {
* type property1;
* ...
* };
@ -238,7 +239,7 @@
*
* .. code-block:: c
*
* FIXTURE_SETUP(fixture name) { implementation }
* FIXTURE_SETUP(fixture_name) { implementation }
*
* Populates the required "setup" function for a fixture. An instance of the
* datatype defined with FIXTURE_DATA() will be exposed as *self* for the
@ -264,7 +265,7 @@
*
* .. code-block:: c
*
* FIXTURE_TEARDOWN(fixture name) { implementation }
* FIXTURE_TEARDOWN(fixture_name) { implementation }
*
* Populates the required "teardown" function for a fixture. An instance of the
* datatype defined with FIXTURE_DATA() will be exposed as *self* for the
@ -285,7 +286,7 @@
*
* .. code-block:: c
*
* FIXTURE_VARIANT(datatype name) {
* FIXTURE_VARIANT(fixture_name) {
* type property1;
* ...
* };
@ -305,8 +306,8 @@
*
* .. code-block:: c
*
* FIXTURE_ADD(datatype name) {
* .property1 = val1;
* FIXTURE_VARIANT_ADD(fixture_name, variant_name) {
* .property1 = val1,
* ...
* };
*

1
tools/testing/selftests/seccomp/config
View File

@ -1,2 +1,3 @@
CONFIG_SECCOMP=y
CONFIG_SECCOMP_FILTER=y
CONFIG_USER_NS=y

78
tools/testing/selftests/seccomp/seccomp_benchmark.c
View File

@ -18,9 +18,9 @@
unsigned long long timing(clockid_t clk_id, unsigned long long samples)
{
pid_t pid, ret;
unsigned long long i;
struct timespec start, finish;
unsigned long long i;
pid_t pid, ret;
pid = getpid();
assert(clock_gettime(clk_id, &start) == 0);
@ -31,30 +31,43 @@ unsigned long long timing(clockid_t clk_id, unsigned long long samples)
assert(clock_gettime(clk_id, &finish) == 0);
i = finish.tv_sec - start.tv_sec;
i *= 1000000000;
i *= 1000000000ULL;
i += finish.tv_nsec - start.tv_nsec;
printf("%lu.%09lu - %lu.%09lu = %llu\n",
printf("%lu.%09lu - %lu.%09lu = %llu (%.1fs)\n",
finish.tv_sec, finish.tv_nsec,
start.tv_sec, start.tv_nsec,
i);
i, (double)i / 1000000000.0);
return i;
}
unsigned long long calibrate(void)
{
unsigned long long i;
struct timespec start, finish;
unsigned long long i, samples, step = 9973;
pid_t pid, ret;
int seconds = 15;
printf("Calibrating reasonable sample size...\n");
printf("Calibrating sample size for %d seconds worth of syscalls ...\n", seconds);
for (i = 5; ; i++) {
unsigned long long samples = 1 << i;
samples = 0;
pid = getpid();
assert(clock_gettime(CLOCK_MONOTONIC, &start) == 0);
do {
for (i = 0; i < step; i++) {
ret = syscall(__NR_getpid);
assert(pid == ret);
}
assert(clock_gettime(CLOCK_MONOTONIC, &finish) == 0);
/* Find something that takes more than 5 seconds to run. */
if (timing(CLOCK_REALTIME, samples) / 1000000000ULL > 5)
return samples;
}
samples += step;
i = finish.tv_sec - start.tv_sec;
i *= 1000000000ULL;
i += finish.tv_nsec - start.tv_nsec;
} while (i < 1000000000ULL);
return samples * seconds;
}
int main(int argc, char *argv[])
@ -68,32 +81,55 @@ int main(int argc, char *argv[])
};
long ret;
unsigned long long samples;
unsigned long long native, filtered;
unsigned long long native, filter1, filter2;
printf("Current BPF sysctl settings:\n");
system("sysctl net.core.bpf_jit_enable");
system("sysctl net.core.bpf_jit_harden");
if (argc > 1)
samples = strtoull(argv[1], NULL, 0);
else
samples = calibrate();
printf("Benchmarking %llu samples...\n", samples);
printf("Benchmarking %llu syscalls...\n", samples);
/* Native call */
native = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples;
printf("getpid native: %llu ns\n", native);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
assert(ret == 0);
/* One filter */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
assert(ret == 0);
filtered = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples;
printf("getpid RET_ALLOW: %llu ns\n", filtered);
filter1 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples;
printf("getpid RET_ALLOW 1 filter: %llu ns\n", filter1);
printf("Estimated seccomp overhead per syscall: %llu ns\n",
filtered - native);
if (filter1 == native)
printf("No overhead measured!? Try running again with more samples.\n");
if (filtered == native)
printf("Trying running again with more samples.\n");
/* Two filters */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
assert(ret == 0);
filter2 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples;
printf("getpid RET_ALLOW 2 filters: %llu ns\n", filter2);
/* Calculations */
printf("Estimated total seccomp overhead for 1 filter: %llu ns\n",
filter1 - native);
printf("Estimated total seccomp overhead for 2 filters: %llu ns\n",
filter2 - native);
printf("Estimated seccomp per-filter overhead: %llu ns\n",
filter2 - filter1);
printf("Estimated seccomp entry overhead: %llu ns\n",
filter1 - native - (filter2 - filter1));
return 0;
}

708
tools/testing/selftests/seccomp/seccomp_bpf.c
View File

@ -45,12 +45,19 @@
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/kcmp.h>
#include <sys/resource.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <poll.h>
#include "../kselftest_harness.h"
#include "../clone3/clone3_selftests.h"
/* Attempt to de-conflict with the selftests tree. */
#ifndef SKIP
#define SKIP(s, ...) XFAIL(s, ##__VA_ARGS__)
#endif
#ifndef PR_SET_PTRACER
# define PR_SET_PTRACER 0x59616d61
@ -167,7 +174,9 @@ struct seccomp_metadata {
#ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
#define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3)
#endif
#ifndef SECCOMP_RET_USER_NOTIF
#define SECCOMP_RET_USER_NOTIF 0x7fc00000U
#define SECCOMP_IOC_MAGIC '!'
@ -180,7 +189,7 @@ struct seccomp_metadata {
#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
struct seccomp_notif_resp)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64)
struct seccomp_notif {
__u64 id;
@ -203,6 +212,39 @@ struct seccomp_notif_sizes {
};
#endif
#ifndef SECCOMP_IOCTL_NOTIF_ADDFD
/* On success, the return value is the remote process's added fd number */
#define SECCOMP_IOCTL_NOTIF_ADDFD SECCOMP_IOW(3, \
struct seccomp_notif_addfd)
/* valid flags for seccomp_notif_addfd */
#define SECCOMP_ADDFD_FLAG_SETFD (1UL << 0) /* Specify remote fd */
struct seccomp_notif_addfd {
__u64 id;
__u32 flags;
__u32 srcfd;
__u32 newfd;
__u32 newfd_flags;
};
#endif
struct seccomp_notif_addfd_small {
__u64 id;
char weird[4];
};
#define SECCOMP_IOCTL_NOTIF_ADDFD_SMALL \
SECCOMP_IOW(3, struct seccomp_notif_addfd_small)
struct seccomp_notif_addfd_big {
union {
struct seccomp_notif_addfd addfd;
char buf[sizeof(struct seccomp_notif_addfd) + 8];
};
};
#define SECCOMP_IOCTL_NOTIF_ADDFD_BIG \
SECCOMP_IOWR(3, struct seccomp_notif_addfd_big)
#ifndef PTRACE_EVENTMSG_SYSCALL_ENTRY
#define PTRACE_EVENTMSG_SYSCALL_ENTRY 1
#define PTRACE_EVENTMSG_SYSCALL_EXIT 2
@ -236,6 +278,40 @@ int seccomp(unsigned int op, unsigned int flags, void *args)
#define SIBLING_EXIT_FAILURE 0xbadface
#define SIBLING_EXIT_NEWPRIVS 0xbadfeed
static int __filecmp(pid_t pid1, pid_t pid2, int fd1, int fd2)
{
#ifdef __NR_kcmp
errno = 0;
return syscall(__NR_kcmp, pid1, pid2, KCMP_FILE, fd1, fd2);
#else
errno = ENOSYS;
return -1;
#endif
}
/* Have TH_LOG report actual location filecmp() is used. */
#define filecmp(pid1, pid2, fd1, fd2) ({ \
int _ret; \
\
_ret = __filecmp(pid1, pid2, fd1, fd2); \
if (_ret != 0) { \
if (_ret < 0 && errno == ENOSYS) { \
TH_LOG("kcmp() syscall missing (test is less accurate)");\
_ret = 0; \
} \
} \
_ret; })
TEST(kcmp)
{
int ret;
ret = __filecmp(getpid(), getpid(), 1, 1);
EXPECT_EQ(ret, 0);
if (ret != 0 && errno == ENOSYS)
SKIP(return, "Kernel does not support kcmp() (missing CONFIG_CHECKPOINT_RESTORE?)");
}
TEST(mode_strict_support)
{
long ret;
@ -1470,6 +1546,7 @@ pid_t setup_trace_fixture(struct __test_metadata *_metadata,
return tracer_pid;
}
void teardown_trace_fixture(struct __test_metadata *_metadata,
pid_t tracer)
{
@ -1750,7 +1827,7 @@ void change_syscall(struct __test_metadata *_metadata,
EXPECT_EQ(0, ret);
}
void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
void tracer_seccomp(struct __test_metadata *_metadata, pid_t tracee,
int status, void *args)
{
int ret;
@ -1827,6 +1904,24 @@ FIXTURE(TRACE_syscall) {
pid_t tracer, mytid, mypid, parent;
};
FIXTURE_VARIANT(TRACE_syscall) {
/*
* All of the SECCOMP_RET_TRACE behaviors can be tested with either
* SECCOMP_RET_TRACE+PTRACE_CONT or plain ptrace()+PTRACE_SYSCALL.
* This indicates if we should use SECCOMP_RET_TRACE (false), or
* ptrace (true).
*/
bool use_ptrace;
};
FIXTURE_VARIANT_ADD(TRACE_syscall, ptrace) {
.use_ptrace = true,
};
FIXTURE_VARIANT_ADD(TRACE_syscall, seccomp) {
.use_ptrace = false,
};
FIXTURE_SETUP(TRACE_syscall)
{
struct sock_filter filter[] = {
@ -1842,12 +1937,11 @@ FIXTURE_SETUP(TRACE_syscall)
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1005),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
};
memset(&self->prog, 0, sizeof(self->prog));
self->prog.filter = malloc(sizeof(filter));
ASSERT_NE(NULL, self->prog.filter);
memcpy(self->prog.filter, filter, sizeof(filter));
self->prog.len = (unsigned short)ARRAY_SIZE(filter);
struct sock_fprog prog = {
.len = (unsigned short)ARRAY_SIZE(filter),
.filter = filter,
};
long ret;
/* Prepare some testable syscall results. */
self->mytid = syscall(__NR_gettid);
@ -1865,60 +1959,48 @@ FIXTURE_SETUP(TRACE_syscall)
ASSERT_NE(self->parent, self->mypid);
/* Launch tracer. */
self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
false);
self->tracer = setup_trace_fixture(_metadata,
variant->use_ptrace ? tracer_ptrace
: tracer_seccomp,
NULL, variant->use_ptrace);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
if (variant->use_ptrace)
return;
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
ASSERT_EQ(0, ret);
}
FIXTURE_TEARDOWN(TRACE_syscall)
{
teardown_trace_fixture(_metadata, self->tracer);
if (self->prog.filter)
free(self->prog.filter);
}
TEST_F(TRACE_syscall, ptrace_syscall_redirected)
TEST(negative_ENOSYS)
{
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
teardown_trace_fixture(_metadata, self->tracer);
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
true);
/* Tracer will redirect getpid to getppid. */
EXPECT_NE(self->mypid, syscall(__NR_getpid));
/*
* There should be no difference between an "internal" skip
* and userspace asking for syscall "-1".
*/
errno = 0;
EXPECT_EQ(-1, syscall(-1));
EXPECT_EQ(errno, ENOSYS);
/* And no difference for "still not valid but not -1". */
errno = 0;
EXPECT_EQ(-1, syscall(-101));
EXPECT_EQ(errno, ENOSYS);
}
TEST_F(TRACE_syscall, ptrace_syscall_errno)
TEST_F(TRACE_syscall, negative_ENOSYS)
{
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
teardown_trace_fixture(_metadata, self->tracer);
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
true);
/* Tracer should skip the open syscall, resulting in ESRCH. */
EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
}
TEST_F(TRACE_syscall, ptrace_syscall_faked)
{
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
teardown_trace_fixture(_metadata, self->tracer);
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
true);
/* Tracer should skip the gettid syscall, resulting fake pid. */
EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
negative_ENOSYS(_metadata);
}
TEST_F(TRACE_syscall, syscall_allowed)
{
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* getppid works as expected (no changes). */
EXPECT_EQ(self->parent, syscall(__NR_getppid));
EXPECT_NE(self->mypid, syscall(__NR_getppid));
@ -1926,14 +2008,6 @@ TEST_F(TRACE_syscall, syscall_allowed)
TEST_F(TRACE_syscall, syscall_redirected)
{
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* getpid has been redirected to getppid as expected. */
EXPECT_EQ(self->parent, syscall(__NR_getpid));
EXPECT_NE(self->mypid, syscall(__NR_getpid));
@ -1941,33 +2015,17 @@ TEST_F(TRACE_syscall, syscall_redirected)
TEST_F(TRACE_syscall, syscall_errno)
{
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* openat has been skipped and an errno return. */
/* Tracer should skip the open syscall, resulting in ESRCH. */
EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
}
TEST_F(TRACE_syscall, syscall_faked)
{
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* gettid has been skipped and an altered return value stored. */
/* Tracer skips the gettid syscall and store altered return value. */
EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
}
TEST_F(TRACE_syscall, skip_after_RET_TRACE)
TEST_F(TRACE_syscall, skip_after)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
@ -1982,14 +2040,7 @@ TEST_F(TRACE_syscall, skip_after_RET_TRACE)
};
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
/* Install fixture filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* Install "errno on getppid" filter. */
/* Install additional "errno on getppid" filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
ASSERT_EQ(0, ret);
@ -1999,7 +2050,7 @@ TEST_F(TRACE_syscall, skip_after_RET_TRACE)
EXPECT_EQ(EPERM, errno);
}
TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
TEST_F_SIGNAL(TRACE_syscall, kill_after, SIGSYS)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
@ -2014,77 +2065,7 @@ TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
};
long ret;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
/* Install fixture filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret);
/* Install "death on getppid" filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
ASSERT_EQ(0, ret);
/* Tracer will redirect getpid to getppid, and we should die. */
EXPECT_NE(self->mypid, syscall(__NR_getpid));
}
TEST_F(TRACE_syscall, skip_after_ptrace)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
offsetof(struct seccomp_data, nr)),
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
};
struct sock_fprog prog = {
.len = (unsigned short)ARRAY_SIZE(filter),
.filter = filter,
};
long ret;
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
teardown_trace_fixture(_metadata, self->tracer);
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
true);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
/* Install "errno on getppid" filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
ASSERT_EQ(0, ret);
/* Tracer will redirect getpid to getppid, and we should see EPERM. */
EXPECT_EQ(-1, syscall(__NR_getpid));
EXPECT_EQ(EPERM, errno);
}
TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
offsetof(struct seccomp_data, nr)),
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
};
struct sock_fprog prog = {
.len = (unsigned short)ARRAY_SIZE(filter),
.filter = filter,
};
long ret;
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
teardown_trace_fixture(_metadata, self->tracer);
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
true);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret);
/* Install "death on getppid" filter. */
/* Install additional "death on getppid" filter. */
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
ASSERT_EQ(0, ret);
@ -3069,7 +3050,7 @@ TEST(get_metadata)
/* Only real root can get metadata. */
if (geteuid()) {
XFAIL(return, "get_metadata requires real root");
SKIP(return, "get_metadata requires real root");
return;
}
@ -3112,7 +3093,7 @@ TEST(get_metadata)
ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
EXPECT_EQ(sizeof(md), ret) {
if (errno == EINVAL)
XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
SKIP(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
}
EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG);
@ -3128,7 +3109,7 @@ TEST(get_metadata)
ASSERT_EQ(0, kill(pid, SIGKILL));
}
static int user_trap_syscall(int nr, unsigned int flags)
static int user_notif_syscall(int nr, unsigned int flags)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
@ -3174,7 +3155,7 @@ TEST(user_notification_basic)
/* Check that we get -ENOSYS with no listener attached */
if (pid == 0) {
if (user_trap_syscall(__NR_getppid, 0) < 0)
if (user_notif_syscall(__NR_getppid, 0) < 0)
exit(1);
ret = syscall(__NR_getppid);
exit(ret >= 0 || errno != ENOSYS);
@ -3191,13 +3172,13 @@ TEST(user_notification_basic)
EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
/* Check that the basic notification machinery works */
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
/* Installing a second listener in the chain should EBUSY */
EXPECT_EQ(user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER),
EXPECT_EQ(user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER),
-1);
EXPECT_EQ(errno, EBUSY);
@ -3258,15 +3239,20 @@ TEST(user_notification_with_tsync)
int ret;
unsigned int flags;
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
/* these were exclusive */
flags = SECCOMP_FILTER_FLAG_NEW_LISTENER |
SECCOMP_FILTER_FLAG_TSYNC;
ASSERT_EQ(-1, user_trap_syscall(__NR_getppid, flags));
ASSERT_EQ(-1, user_notif_syscall(__NR_getppid, flags));
ASSERT_EQ(EINVAL, errno);
/* but now they're not */
flags |= SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
ret = user_trap_syscall(__NR_getppid, flags);
ret = user_notif_syscall(__NR_getppid, flags);
close(ret);
ASSERT_LE(0, ret);
}
@ -3284,8 +3270,8 @@ TEST(user_notification_kill_in_middle)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
/*
@ -3338,8 +3324,8 @@ TEST(user_notification_signal)
ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);
listener = user_trap_syscall(__NR_gettid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_gettid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
@ -3408,8 +3394,8 @@ TEST(user_notification_closed_listener)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
/*
@ -3440,10 +3426,13 @@ TEST(user_notification_child_pid_ns)
struct seccomp_notif req = {};
struct seccomp_notif_resp resp = {};
ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0);
ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0) {
if (errno == EINVAL)
SKIP(return, "kernel missing CLONE_NEWUSER support");
};
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
@ -3482,8 +3471,8 @@ TEST(user_notification_sibling_pid_ns)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
@ -3505,7 +3494,10 @@ TEST(user_notification_sibling_pid_ns)
}
/* Create the sibling ns, and sibling in it. */
ASSERT_EQ(unshare(CLONE_NEWPID), 0);
ASSERT_EQ(unshare(CLONE_NEWPID), 0) {
if (errno == EPERM)
SKIP(return, "CLONE_NEWPID requires CAP_SYS_ADMIN");
}
ASSERT_EQ(errno, 0);
pid2 = fork();
@ -3547,8 +3539,8 @@ TEST(user_notification_fault_recv)
ASSERT_EQ(unshare(CLONE_NEWUSER), 0);
listener = user_trap_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
@ -3585,16 +3577,6 @@ TEST(seccomp_get_notif_sizes)
EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp));
}
static int filecmp(pid_t pid1, pid_t pid2, int fd1, int fd2)
{
#ifdef __NR_kcmp
return syscall(__NR_kcmp, pid1, pid2, KCMP_FILE, fd1, fd2);
#else
errno = ENOSYS;
return -1;
#endif
}
TEST(user_notification_continue)
{
pid_t pid;
@ -3609,7 +3591,7 @@ TEST(user_notification_continue)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
listener = user_trap_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
@ -3619,20 +3601,14 @@ TEST(user_notification_continue)
int dup_fd, pipe_fds[2];
pid_t self;
ret = pipe(pipe_fds);
if (ret < 0)
exit(1);
ASSERT_GE(pipe(pipe_fds), 0);
dup_fd = dup(pipe_fds[0]);
if (dup_fd < 0)
exit(1);
ASSERT_GE(dup_fd, 0);
EXPECT_NE(pipe_fds[0], dup_fd);
self = getpid();
ret = filecmp(self, self, pipe_fds[0], dup_fd);
if (ret)
exit(2);
ASSERT_EQ(filecmp(self, self, pipe_fds[0], dup_fd), 0);
exit(0);
}
@ -3673,7 +3649,7 @@ TEST(user_notification_continue)
resp.val = 0;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0) {
if (errno == EINVAL)
XFAIL(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
SKIP(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
}
skip:
@ -3681,15 +3657,342 @@ TEST(user_notification_continue)
EXPECT_EQ(true, WIFEXITED(status));
EXPECT_EQ(0, WEXITSTATUS(status)) {
if (WEXITSTATUS(status) == 2) {
XFAIL(return, "Kernel does not support kcmp() syscall");
SKIP(return, "Kernel does not support kcmp() syscall");
return;
}
}
}
TEST(user_notification_filter_empty)
{
pid_t pid;
long ret;
int status;
struct pollfd pollfd;
struct clone_args args = {
.flags = CLONE_FILES,
.exit_signal = SIGCHLD,
};
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
pid = sys_clone3(&args, sizeof(args));
ASSERT_GE(pid, 0);
if (pid == 0) {
int listener;
listener = user_notif_syscall(__NR_mknod, SECCOMP_FILTER_FLAG_NEW_LISTENER);
if (listener < 0)
_exit(EXIT_FAILURE);
if (dup2(listener, 200) != 200)
_exit(EXIT_FAILURE);
close(listener);
_exit(EXIT_SUCCESS);
}
EXPECT_EQ(waitpid(pid, &status, 0), pid);
EXPECT_EQ(true, WIFEXITED(status));
EXPECT_EQ(0, WEXITSTATUS(status));
/*
* The seccomp filter has become unused so we should be notified once
* the kernel gets around to cleaning up task struct.
*/
pollfd.fd = 200;
pollfd.events = POLLHUP;
EXPECT_GT(poll(&pollfd, 1, 2000), 0);
EXPECT_GT((pollfd.revents & POLLHUP) ?: 0, 0);
}
static void *do_thread(void *data)
{
return NULL;
}
TEST(user_notification_filter_empty_threaded)
{
pid_t pid;
long ret;
int status;
struct pollfd pollfd;
struct clone_args args = {
.flags = CLONE_FILES,
.exit_signal = SIGCHLD,
};
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
pid = sys_clone3(&args, sizeof(args));
ASSERT_GE(pid, 0);
if (pid == 0) {
pid_t pid1, pid2;
int listener, status;
pthread_t thread;
listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
if (listener < 0)
_exit(EXIT_FAILURE);
if (dup2(listener, 200) != 200)
_exit(EXIT_FAILURE);
close(listener);
pid1 = fork();
if (pid1 < 0)
_exit(EXIT_FAILURE);
if (pid1 == 0)
_exit(EXIT_SUCCESS);
pid2 = fork();
if (pid2 < 0)
_exit(EXIT_FAILURE);
if (pid2 == 0)
_exit(EXIT_SUCCESS);
if (pthread_create(&thread, NULL, do_thread, NULL) ||
pthread_join(thread, NULL))
_exit(EXIT_FAILURE);
if (pthread_create(&thread, NULL, do_thread, NULL) ||
pthread_join(thread, NULL))
_exit(EXIT_FAILURE);
if (waitpid(pid1, &status, 0) != pid1 || !WIFEXITED(status) ||
WEXITSTATUS(status))
_exit(EXIT_FAILURE);
if (waitpid(pid2, &status, 0) != pid2 || !WIFEXITED(status) ||
WEXITSTATUS(status))
_exit(EXIT_FAILURE);
exit(EXIT_SUCCESS);
}
EXPECT_EQ(waitpid(pid, &status, 0), pid);
EXPECT_EQ(true, WIFEXITED(status));
EXPECT_EQ(0, WEXITSTATUS(status));
/*
* The seccomp filter has become unused so we should be notified once
* the kernel gets around to cleaning up task struct.
*/
pollfd.fd = 200;
pollfd.events = POLLHUP;
EXPECT_GT(poll(&pollfd, 1, 2000), 0);
EXPECT_GT((pollfd.revents & POLLHUP) ?: 0, 0);
}
TEST(user_notification_addfd)
{
pid_t pid;
long ret;
int status, listener, memfd, fd;
struct seccomp_notif_addfd addfd = {};
struct seccomp_notif_addfd_small small = {};
struct seccomp_notif_addfd_big big = {};
struct seccomp_notif req = {};
struct seccomp_notif_resp resp = {};
/* 100 ms */
struct timespec delay = { .tv_nsec = 100000000 };
memfd = memfd_create("test", 0);
ASSERT_GE(memfd, 0);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
/* Check that the basic notification machinery works */
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0) {
if (syscall(__NR_getppid) != USER_NOTIF_MAGIC)
exit(1);
exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
}
ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
addfd.srcfd = memfd;
addfd.newfd = 0;
addfd.id = req.id;
addfd.flags = 0x0;
/* Verify bad newfd_flags cannot be set */
addfd.newfd_flags = ~O_CLOEXEC;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
EXPECT_EQ(errno, EINVAL);
addfd.newfd_flags = O_CLOEXEC;
/* Verify bad flags cannot be set */
addfd.flags = 0xff;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
EXPECT_EQ(errno, EINVAL);
addfd.flags = 0;
/* Verify that remote_fd cannot be set without setting flags */
addfd.newfd = 1;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
EXPECT_EQ(errno, EINVAL);
addfd.newfd = 0;
/* Verify small size cannot be set */
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_SMALL, &small), -1);
EXPECT_EQ(errno, EINVAL);
/* Verify we can't send bits filled in unknown buffer area */
memset(&big, 0xAA, sizeof(big));
big.addfd = addfd;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_BIG, &big), -1);
EXPECT_EQ(errno, E2BIG);
/* Verify we can set an arbitrary remote fd */
fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd);
/*
* The child has fds 0(stdin), 1(stdout), 2(stderr), 3(memfd),
* 4(listener), so the newly allocated fd should be 5.
*/
EXPECT_EQ(fd, 5);
EXPECT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
/* Verify we can set an arbitrary remote fd with large size */
memset(&big, 0x0, sizeof(big));
big.addfd = addfd;
fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_BIG, &big);
EXPECT_EQ(fd, 6);
/* Verify we can set a specific remote fd */
addfd.newfd = 42;
addfd.flags = SECCOMP_ADDFD_FLAG_SETFD;
fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd);
EXPECT_EQ(fd, 42);
EXPECT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
/* Resume syscall */
resp.id = req.id;
resp.error = 0;
resp.val = USER_NOTIF_MAGIC;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
/*
* This sets the ID of the ADD FD to the last request plus 1. The
* notification ID increments 1 per notification.
*/
addfd.id = req.id + 1;
/* This spins until the underlying notification is generated */
while (ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd) != -1 &&
errno != -EINPROGRESS)
nanosleep(&delay, NULL);
memset(&req, 0, sizeof(req));
ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
ASSERT_EQ(addfd.id, req.id);
resp.id = req.id;
resp.error = 0;
resp.val = USER_NOTIF_MAGIC;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
/* Wait for child to finish. */
EXPECT_EQ(waitpid(pid, &status, 0), pid);
EXPECT_EQ(true, WIFEXITED(status));
EXPECT_EQ(0, WEXITSTATUS(status));
close(memfd);
}
TEST(user_notification_addfd_rlimit)
{
pid_t pid;
long ret;
int status, listener, memfd;
struct seccomp_notif_addfd addfd = {};
struct seccomp_notif req = {};
struct seccomp_notif_resp resp = {};
const struct rlimit lim = {
.rlim_cur = 0,
.rlim_max = 0,
};
memfd = memfd_create("test", 0);
ASSERT_GE(memfd, 0);
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}
/* Check that the basic notification machinery works */
listener = user_notif_syscall(__NR_getppid,
SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);
pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0)
exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
ASSERT_EQ(prlimit(pid, RLIMIT_NOFILE, &lim, NULL), 0);
addfd.srcfd = memfd;
addfd.newfd_flags = O_CLOEXEC;
addfd.newfd = 0;
addfd.id = req.id;
addfd.flags = 0;
/* Should probably spot check /proc/sys/fs/file-nr */
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
EXPECT_EQ(errno, EMFILE);
addfd.newfd = 100;
addfd.flags = SECCOMP_ADDFD_FLAG_SETFD;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
EXPECT_EQ(errno, EBADF);
resp.id = req.id;
resp.error = 0;
resp.val = USER_NOTIF_MAGIC;
EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
/* Wait for child to finish. */
EXPECT_EQ(waitpid(pid, &status, 0), pid);
EXPECT_EQ(true, WIFEXITED(status));
EXPECT_EQ(0, WEXITSTATUS(status));
close(memfd);
}
/*
* TODO:
* - add microbenchmarks
* - expand NNP testing
* - better arch-specific TRACE and TRAP handlers.
* - endianness checking when appropriate
@ -3697,7 +4000,6 @@ TEST(user_notification_continue)
* - arch value testing (x86 modes especially)
* - verify that FILTER_FLAG_LOG filters generate log messages
* - verify that RET_LOG generates log messages
* - ...
*/
TEST_HARNESS_MAIN

1
tools/testing/selftests/seccomp/settings Normal file
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@ -0,0 +1 @@
timeout=90