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authorRoland McGrath <roland@redhat.com>2008-08-07 16:55:03 -0700
committerRoland McGrath <roland@redhat.com>2008-08-07 17:18:47 -0700
commit5861bbfcc10fc0358abf52c7d22850c8d180f0b0 (patch)
tree066a66bd465741973879675b150f517032adcbfa
parent685d87f7ccc649ab92b55e18e507a65d0e694eb9 (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.h2
-rw-r--r--include/linux/tracehook.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index fd31756e1a00..ea7416c901d1 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 ab3ef7aefa95..b48d81969574 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.
*/