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Commit 7d941432 authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
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Fix spurious syscall tracing after PTRACE_DETACH + PTRACE_ATTACH 



When PTRACE_SYSCALL was used and then PTRACE_DETACH is used, the
TIF_SYSCALL_TRACE flag is left set on the formerly-traced task.  This
means that when a new tracer comes along and does PTRACE_ATTACH, it's
possible he gets a syscall tracing stop even though he's never used
PTRACE_SYSCALL.  This happens if the task was in the middle of a system
call when the second PTRACE_ATTACH was done.  The symptom is an
unexpected SIGTRAP when the tracer thinks that only SIGSTOP should have
been provoked by his ptrace calls so far.

A few machines already fixed this in ptrace_disable (i386, ia64, m68k).
But all other machines do not, and still have this bug.  On x86_64, this
constitutes a regression in IA32 compatibility support.

Since all machines now use TIF_SYSCALL_TRACE for this, I put the
clearing of TIF_SYSCALL_TRACE in the generic ptrace_detach code rather
than adding it to every other machine's ptrace_disable.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 897ee77b

arch/i386/kernel/ptrace.c

+0 −1
Original line number Diff line number Diff line
@@ -274,7 +274,6 @@ static void clear_singlestep(struct task_struct *child) 
void ptrace_disable(struct task_struct *child)

{ 

	clear_singlestep(child);

	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

	clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);

}

arch/ia64/kernel/ptrace.c

+0 −1
Original line number Diff line number Diff line
@@ -1577,7 +1577,6 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data) 


	      case PTRACE_DETACH:

		/* detach a process that was attached. */

		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

		ret = ptrace_detach(child, data);

		goto out_tsk;

arch/m68k/kernel/ptrace.c

+0 −1
Original line number Diff line number Diff line
@@ -116,7 +116,6 @@ static inline void singlestep_disable(struct task_struct *child) 
void ptrace_disable(struct task_struct *child)

{

	singlestep_disable(child);

	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

}



long arch_ptrace(struct task_struct *child, long request, long addr, long data)

kernel/ptrace.c

+1 −0
Original line number Diff line number Diff line
@@ -233,6 +233,7 @@ int ptrace_detach(struct task_struct *child, unsigned int data) 


	/* Architecture-specific hardware disable .. */

	ptrace_disable(child);

	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);



	write_lock_irq(&tasklist_lock);

	/* protect against de_thread()->release_task() */