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Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull rseq updates from Ingo Molnar:
 "A cleanup and a fix to comments"

* 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rseq: Remove superfluous rseq_len from task_struct
  rseq: Clean up comments by reflecting removal of event counter
This commit is contained in:
Linus Torvalds 2019-05-06 12:46:54 -07:00
commit e50c5d2e72
4 changed files with 5 additions and 16 deletions
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3
arch/arm/kernel/signal.c
View File

@ -549,8 +549,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
int ret;
/*
* Increment event counter and perform fixup for the pre-signal
* frame.
* Perform fixup for the pre-signal frame.
*/
rseq_signal_deliver(ksig, regs);

5
arch/x86/kernel/signal.c
View File

@ -693,10 +693,7 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
sigset_t *set = sigmask_to_save();
compat_sigset_t *cset = (compat_sigset_t *) set;
/*
* Increment event counter and perform fixup for the pre-signal
* frame.
*/
/* Perform fixup for the pre-signal frame. */
rseq_signal_deliver(ksig, regs);
/* Set up the stack frame */

4
include/linux/sched.h
View File

@ -1057,7 +1057,6 @@ struct task_struct {
#ifdef CONFIG_RSEQ
struct rseq __user *rseq;
u32 rseq_len;
u32 rseq_sig;
/*
* RmW on rseq_event_mask must be performed atomically
@ -1855,12 +1854,10 @@ static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
{
if (clone_flags & CLONE_THREAD) {
t->rseq = NULL;
t->rseq_len = 0;
t->rseq_sig = 0;
t->rseq_event_mask = 0;
} else {
t->rseq = current->rseq;
t->rseq_len = current->rseq_len;
t->rseq_sig = current->rseq_sig;
t->rseq_event_mask = current->rseq_event_mask;
}
@ -1869,7 +1866,6 @@ static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
static inline void rseq_execve(struct task_struct *t)
{
t->rseq = NULL;
t->rseq_len = 0;
t->rseq_sig = 0;
t->rseq_event_mask = 0;
}

9
kernel/rseq.c
View File

@ -254,8 +254,7 @@ static int rseq_ip_fixup(struct pt_regs *regs)
* - signal delivery,
* and return to user-space.
*
* This is how we can ensure that the entire rseq critical section,
* consisting of both the C part and the assembly instruction sequence,
* This is how we can ensure that the entire rseq critical section
* will issue the commit instruction only if executed atomically with
* respect to other threads scheduled on the same CPU, and with respect
* to signal handlers.
@ -314,7 +313,7 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len,
/* Unregister rseq for current thread. */
if (current->rseq != rseq || !current->rseq)
return -EINVAL;
if (current->rseq_len != rseq_len)
if (rseq_len != sizeof(*rseq))
return -EINVAL;
if (current->rseq_sig != sig)
return -EPERM;
@ -322,7 +321,6 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len,
if (ret)
return ret;
current->rseq = NULL;
current->rseq_len = 0;
current->rseq_sig = 0;
return 0;
}
@ -336,7 +334,7 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len,
* the provided address differs from the prior
* one.
*/
if (current->rseq != rseq || current->rseq_len != rseq_len)
if (current->rseq != rseq || rseq_len != sizeof(*rseq))
return -EINVAL;
if (current->rseq_sig != sig)
return -EPERM;
@ -354,7 +352,6 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len,
if (!access_ok(rseq, rseq_len))
return -EFAULT;
current->rseq = rseq;
current->rseq_len = rseq_len;
current->rseq_sig = sig;
/*
* If rseq was previously inactive, and has just been