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signal: Don't use structure initializers for struct siginfo

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The siginfo structure has all manners of holes with the result that a
structure initializer is not guaranteed to initialize all of the bits.
As we have to copy the structure to userspace don't even try to use
a structure initializer.  Instead use clear_siginfo followed by initializing
selected fields.  This gives a guarantee that uninitialized kernel memory
is not copied to userspace.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-01-22 14:58:57 -06:00
parent 66e0f26315
commit 5f74972ce6
9 changed files with 89 additions and 60 deletions
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14
arch/arc/kernel/traps.c
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@ -65,12 +65,14 @@ unhandled_exception(const char *str, struct pt_regs *regs, siginfo_t *info)
#define DO_ERROR_INFO(signr, str, name, sicode) \
int name(unsigned long address, struct pt_regs *regs) \
{ \
siginfo_t info = { \
.si_signo = signr, \
.si_errno = 0, \
.si_code = sicode, \
.si_addr = (void __user *)address, \
}; \
siginfo_t info; \
\
clear_siginfo(&info); \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = (void __user *)address; \
\
return unhandled_exception(str, regs, &info);\
}

13
arch/arm64/kernel/debug-monitors.c
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@ -209,12 +209,13 @@ NOKPROBE_SYMBOL(call_step_hook);
static void send_user_sigtrap(int si_code)
{
struct pt_regs *regs = current_pt_regs();
siginfo_t info = {
.si_signo = SIGTRAP,
.si_errno = 0,
.si_code = si_code,
.si_addr = (void __user *)instruction_pointer(regs),
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = si_code;
info.si_addr = (void __user *)instruction_pointer(regs);
if (WARN_ON(!user_mode(regs)))
return;

13
arch/arm64/kernel/ptrace.c
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@ -180,12 +180,13 @@ static void ptrace_hbptriggered(struct perf_event *bp,
struct pt_regs *regs)
{
struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
siginfo_t info = {
.si_signo = SIGTRAP,
.si_errno = 0,
.si_code = TRAP_HWBKPT,
.si_addr = (void __user *)(bkpt->trigger),
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_HWBKPT;
info.si_addr = (void __user *)(bkpt->trigger);
#ifdef CONFIG_COMPAT
if (is_compat_task()) {

3
arch/m68k/mm/fault.c
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@ -21,8 +21,9 @@ extern void die_if_kernel(char *, struct pt_regs *, long);
int send_fault_sig(struct pt_regs *regs)
{
siginfo_t siginfo = { 0, 0, 0, };
siginfo_t siginfo;
clear_siginfo(&siginfo);
siginfo.si_signo = current->thread.signo;
siginfo.si_code = current->thread.code;
siginfo.si_addr = (void *)current->thread.faddr;

29
arch/mips/kernel/traps.c
View File

@ -699,11 +699,12 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
asmlinkage void do_ov(struct pt_regs *regs)
{
enum ctx_state prev_state;
siginfo_t info = {
.si_signo = SIGFPE,
.si_code = FPE_INTOVF,
.si_addr = (void __user *)regs->cp0_epc,
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGFPE;
info.si_code = FPE_INTOVF;
info.si_addr = (void __user *)regs->cp0_epc;
prev_state = exception_enter();
die_if_kernel("Integer overflow", regs);
@ -721,7 +722,11 @@ asmlinkage void do_ov(struct pt_regs *regs)
void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
struct task_struct *tsk)
{
struct siginfo si = { .si_addr = fault_addr, .si_signo = SIGFPE };
struct siginfo si;
clear_siginfo(&si);
si.si_addr = fault_addr;
si.si_signo = SIGFPE;
if (fcr31 & FPU_CSR_INV_X)
si.si_code = FPE_FLTINV;
@ -739,9 +744,10 @@ void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
{
struct siginfo si = { 0 };
struct siginfo si;
struct vm_area_struct *vma;
clear_siginfo(&si);
switch (sig) {
case 0:
return 0;
@ -890,9 +896,10 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
const char *str)
{
siginfo_t info = { 0 };
siginfo_t info;
char b[40];
clear_siginfo(&info);
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
SIGTRAP) == NOTIFY_STOP)
@ -1499,9 +1506,13 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
*/
asmlinkage void do_watch(struct pt_regs *regs)
{
siginfo_t info = { .si_signo = SIGTRAP, .si_code = TRAP_HWBKPT };
siginfo_t info;
enum ctx_state prev_state;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_code = TRAP_HWBKPT;
prev_state = exception_enter();
/*
* Clear WP (bit 22) bit of cause register so we don't loop

24
arch/tile/kernel/single_step.c
View File

@ -163,11 +163,13 @@ static tilepro_bundle_bits rewrite_load_store_unaligned(
* actual bad address in an SPR, which it doesn't.
*/
if (align_ctl == 0) {
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
.si_addr = addr
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_code = BUS_ADRALN;
info.si_addr = addr;
trace_unhandled_signal("unaligned trap", regs,
(unsigned long)addr, SIGBUS);
force_sig_info(info.si_signo, &info, current);
@ -210,11 +212,13 @@ static tilepro_bundle_bits rewrite_load_store_unaligned(
}
if (err) {
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
.si_addr = addr
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_code = BUS_ADRALN;
info.si_addr = addr;
trace_unhandled_signal("bad address for unaligned fixup", regs,
(unsigned long)addr, SIGBUS);
force_sig_info(info.si_signo, &info, current);

4
arch/tile/kernel/traps.c
View File

@ -256,12 +256,14 @@ static int do_bpt(struct pt_regs *regs)
void __kprobes do_trap(struct pt_regs *regs, int fault_num,
unsigned long reason)
{
siginfo_t info = { 0 };
siginfo_t info;
int signo, code;
unsigned long address = 0;
tile_bundle_bits instr;
int is_kernel = !user_mode(regs);
clear_siginfo(&info);
/* Handle breakpoints, etc. */
if (is_kernel && fault_num == INT_ILL && do_bpt(regs))
return;

46
arch/tile/kernel/unaligned.c
View File

@ -980,11 +980,13 @@ void jit_bundle_gen(struct pt_regs *regs, tilegx_bundle_bits bundle,
}
if ((align_ctl == 0) || unexpected) {
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
.si_addr = (unsigned char __user *)0
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_code = BUS_ADRALN;
info.si_addr = (unsigned char __user *)0;
if (unaligned_printk)
pr_info("Unalign bundle: unexp @%llx, %llx\n",
(unsigned long long)regs->pc,
@ -1396,11 +1398,12 @@ void jit_bundle_gen(struct pt_regs *regs, tilegx_bundle_bits bundle,
&frag, sizeof(frag));
if (status) {
/* Fail to copy JIT into user land. send SIGSEGV. */
siginfo_t info = {
.si_signo = SIGSEGV,
.si_code = SEGV_MAPERR,
.si_addr = (void __user *)&jit_code_area[idx]
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGSEGV;
info.si_code = SEGV_MAPERR;
info.si_addr = (void __user *)&jit_code_area[idx];
pr_warn("Unalign fixup: pid=%d %s jit_code_area=%llx\n",
current->pid, current->comm,
@ -1511,11 +1514,12 @@ void do_unaligned(struct pt_regs *regs, int vecnum)
* If so, we will trigger SIGBUS.
*/
if ((regs->sp & 0x7) || (regs->ex1) || (align_ctl < 0)) {
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
.si_addr = (unsigned char __user *)0
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_code = BUS_ADRALN;
info.si_addr = (unsigned char __user *)0;
if (unaligned_printk)
pr_info("Unalign fixup: %d %llx @%llx\n",
@ -1535,11 +1539,13 @@ void do_unaligned(struct pt_regs *regs, int vecnum)
pc = (tilegx_bundle_bits __user *)(regs->pc);
if (get_user(bundle, pc) != 0) {
/* Probably never be here since pc is valid user address.*/
siginfo_t info = {
.si_signo = SIGSEGV,
.si_code = SEGV_MAPERR,
.si_addr = (void __user *)pc
};
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGSEGV;
info.si_code = SEGV_MAPERR;
info.si_addr = (void __user *)pc;
pr_err("Couldn't read instruction at %p trying to step\n", pc);
trace_unhandled_signal("segfault in unalign fixup", regs,
(unsigned long)info.si_addr, SIGSEGV);

3
kernel/signal.c
View File

@ -3163,8 +3163,9 @@ do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)
static int do_tkill(pid_t tgid, pid_t pid, int sig)
{
struct siginfo info = {};
struct siginfo info;
clear_siginfo(&info);
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_TKILL;