diff options
| author | Roland McGrath <roland@redhat.com> | 2008-08-07 16:55:03 -0700 |
|---|---|---|
| committer | Roland McGrath <roland@redhat.com> | 2008-08-07 17:18:47 -0700 |
| commit | 5861bbfcc10fc0358abf52c7d22850c8d180f0b0 (patch) | |
| tree | 066a66bd465741973879675b150f517032adcbfa | |
| parent | 685d87f7ccc649ab92b55e18e507a65d0e694eb9 (diff) | |
tracehook: fix CLONE_PTRACE
In the change in commit 09a05394fe2448a4139b014936330af23fa7ec83, I
overlooked two nits in the logic and this broke using CLONE_PTRACE
when PTRACE_O_TRACE* are not being used.
A parent that is itself traced at all but not using PTRACE_O_TRACE*,
using CLONE_PTRACE would have its new child fail to be traced.
A parent that is not itself traced at all that uses CLONE_PTRACE
(which should be a no-op in this case) would confuse the bookkeeping
and lead to a crash at exit time.
This restores the missing checks and fixes both failure modes.
Reported-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Roland McGrath <roland@redhat.com>
| -rw-r--r-- | include/linux/ptrace.h | 2 | ||||
| -rw-r--r-- | include/linux/tracehook.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index fd31756e1a0..ea7416c901d 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -172,7 +172,7 @@ static inline void ptrace_init_task(struct task_struct *child, bool ptrace) child->ptrace = 0; if (unlikely(ptrace)) { child->ptrace = current->ptrace; - __ptrace_link(child, current->parent); + ptrace_link(child, current->parent); } } diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index ab3ef7aefa9..b48d8196957 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -280,7 +280,7 @@ static inline void tracehook_report_clone(int trace, struct pt_regs *regs, unsigned long clone_flags, pid_t pid, struct task_struct *child) { - if (unlikely(trace)) { + if (unlikely(trace) || unlikely(clone_flags & CLONE_PTRACE)) { /* * The child starts up with an immediate SIGSTOP. */ |