diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-10-16 19:39:37 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-10-29 18:02:55 +0100 |
| commit | 3ab679661721b1ec2aaad99a801870ed59ab1110 (patch) | |
| tree | f651a01eb98dd5454d433da9ae35579242a2cb36 /include | |
| parent | aa59c53fd4599c91ccf9629af0c2777b89929076 (diff) | |
uprobes: Teach uprobe_copy_process() to handle CLONE_VFORK
uprobe_copy_process() does nothing if the child shares ->mm with
the forking process, but there is a special case: CLONE_VFORK.
In this case it would be more correct to do dup_utask() but avoid
dup_xol(). This is not that important, the child should not unwind
its stack too much, this can corrupt the parent's stack, but at
least we need this to allow to ret-probe __vfork() itself.
Note: in theory, it would be better to check task_pt_regs(p)->sp
instead of CLONE_VFORK, we need to dup_utask() if and only if the
child can return from the function called by the parent. But this
needs the arch-dependant helper, and I think that nobody actually
does clone(same_stack, CLONE_VM).
Reported-by: Martin Cermak <mcermak@redhat.com>
Reported-by: David Smith <dsmith@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/uprobes.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index e6fba627ea4..9e0d5a6fe7a 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -117,7 +117,7 @@ extern void uprobe_start_dup_mmap(void); extern void uprobe_end_dup_mmap(void); extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm); extern void uprobe_free_utask(struct task_struct *t); -extern void uprobe_copy_process(struct task_struct *t); +extern void uprobe_copy_process(struct task_struct *t, unsigned long flags); extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs); extern int uprobe_post_sstep_notifier(struct pt_regs *regs); extern int uprobe_pre_sstep_notifier(struct pt_regs *regs); @@ -174,7 +174,7 @@ static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) static inline void uprobe_free_utask(struct task_struct *t) { } -static inline void uprobe_copy_process(struct task_struct *t) +static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags) { } static inline void uprobe_clear_state(struct mm_struct *mm) |