Commit 2ce413ec authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

Pull rseq fixes from Thomas Gleixer:
 "A pile of rseq related fixups:

   - Prevent infinite recursion when delivering SIGSEGV

   - Remove the abort of rseq critical section on fork() as syscalls
     inside rseq critical sections are explicitely forbidden. So no
     point in doing the abort on the child.

   - Align the rseq structure on 32 bytes in the ARM selftest code.

   - Fix file permissions of the test script"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rseq: Avoid infinite recursion when delivering SIGSEGV
  rseq/cleanup: Do not abort rseq c.s. in child on fork()
  rseq/selftests/arm: Align 'struct rseq_cs' on 32 bytes
  rseq/selftests: Make run_param_test.sh executable
parents 64dd7655 784e0300

arch/arm/kernel/signal.c

+2 −2
Original line number Diff line number Diff line
@@ -544,7 +544,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) 
	 * Increment event counter and perform fixup for the pre-signal

	 * frame.

	 */

	rseq_signal_deliver(regs);

	rseq_signal_deliver(ksig, regs);



	/*

	 * Set up the stack frame
@@ -666,7 +666,7 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) 
			} else {

				clear_thread_flag(TIF_NOTIFY_RESUME);

				tracehook_notify_resume(regs);

				rseq_handle_notify_resume(regs);

				rseq_handle_notify_resume(NULL, regs);

			}

		}

		local_irq_disable();

arch/powerpc/kernel/signal.c

+2 −2
Original line number Diff line number Diff line
@@ -134,7 +134,7 @@ static void do_signal(struct task_struct *tsk) 
	/* Re-enable the breakpoints for the signal stack */

	thread_change_pc(tsk, tsk->thread.regs);



	rseq_signal_deliver(tsk->thread.regs);

	rseq_signal_deliver(&ksig, tsk->thread.regs);



	if (is32) {

        	if (ksig.ka.sa.sa_flags & SA_SIGINFO)
@@ -170,7 +170,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) 
	if (thread_info_flags & _TIF_NOTIFY_RESUME) {

		clear_thread_flag(TIF_NOTIFY_RESUME);

		tracehook_notify_resume(regs);

		rseq_handle_notify_resume(regs);

		rseq_handle_notify_resume(NULL, regs);

	}



	user_enter();

arch/x86/entry/common.c

+1 −1
Original line number Diff line number Diff line
@@ -164,7 +164,7 @@ static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags) 
		if (cached_flags & _TIF_NOTIFY_RESUME) {

			clear_thread_flag(TIF_NOTIFY_RESUME);

			tracehook_notify_resume(regs);

			rseq_handle_notify_resume(regs);

			rseq_handle_notify_resume(NULL, regs);

		}



		if (cached_flags & _TIF_USER_RETURN_NOTIFY)

arch/x86/kernel/signal.c

+1 −1
Original line number Diff line number Diff line
@@ -692,7 +692,7 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs) 
	 * Increment event counter and perform fixup for the pre-signal

	 * frame.

	 */

	rseq_signal_deliver(regs);

	rseq_signal_deliver(ksig, regs);



	/* Set up the stack frame */

	if (is_ia32_frame(ksig)) {

include/linux/sched.h

+12 −11
Original line number Diff line number Diff line
@@ -1799,20 +1799,22 @@ static inline void rseq_set_notify_resume(struct task_struct *t) 
		set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);

}



void __rseq_handle_notify_resume(struct pt_regs *regs);

void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);



static inline void rseq_handle_notify_resume(struct pt_regs *regs)

static inline void rseq_handle_notify_resume(struct ksignal *ksig,

					     struct pt_regs *regs)

{

	if (current->rseq)

		__rseq_handle_notify_resume(regs);

		__rseq_handle_notify_resume(ksig, regs);

}



static inline void rseq_signal_deliver(struct pt_regs *regs)

static inline void rseq_signal_deliver(struct ksignal *ksig,

				       struct pt_regs *regs)

{

	preempt_disable();

	__set_bit(RSEQ_EVENT_SIGNAL_BIT, &current->rseq_event_mask);

	preempt_enable();

	rseq_handle_notify_resume(regs);

	rseq_handle_notify_resume(ksig, regs);

}



/* rseq_preempt() requires preemption to be disabled. */
@@ -1831,9 +1833,7 @@ static inline void rseq_migrate(struct task_struct *t) 


/*

 * If parent process has a registered restartable sequences area, the

 * child inherits. Only applies when forking a process, not a thread. In

 * case a parent fork() in the middle of a restartable sequence, set the

 * resume notifier to force the child to retry.

 * child inherits. Only applies when forking a process, not a thread.

 */

static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)

{
@@ -1847,7 +1847,6 @@ static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) 
		t->rseq_len = current->rseq_len;

		t->rseq_sig = current->rseq_sig;

		t->rseq_event_mask = current->rseq_event_mask;

		rseq_preempt(t);

	}

}
@@ -1864,10 +1863,12 @@ static inline void rseq_execve(struct task_struct *t) 
static inline void rseq_set_notify_resume(struct task_struct *t)

{

}

static inline void rseq_handle_notify_resume(struct pt_regs *regs)

static inline void rseq_handle_notify_resume(struct ksignal *ksig,

					     struct pt_regs *regs)

{

}

static inline void rseq_signal_deliver(struct pt_regs *regs)

static inline void rseq_signal_deliver(struct ksignal *ksig,

				       struct pt_regs *regs)

{

}

static inline void rseq_preempt(struct task_struct *t)

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