diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-11-21 13:26:07 -0800 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2014-12-10 17:49:33 +0000 |
| commit | 58ab4e8991995827937c25cad2ddb4e32db55420 (patch) | |
| tree | 2e92da5f0c9127d9eff750b801bdcfbab0cd1947 /kernel | |
| parent | 6d90a2f6e8bf41f39c8d7772d1e07198774d1bd9 (diff) | |
uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY_RESUME
commit 82975bc6a6df743b9a01810fb32cb65d0ec5d60b upstream.
x86 call do_notify_resume on paranoid returns if TIF_UPROBE is set but
not on non-paranoid returns. I suspect that this is a mistake and that
the code only works because int3 is paranoid.
Setting _TIF_NOTIFY_RESUME in the uprobe code was probably a workaround
for the x86 bug. With that bug fixed, we can remove _TIF_NOTIFY_RESUME
from the uprobes code.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 6f3254e8c137..9a4d44f93015 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1639,7 +1639,6 @@ bool uprobe_deny_signal(void) if (__fatal_signal_pending(t) || arch_uprobe_xol_was_trapped(t)) { utask->state = UTASK_SSTEP_TRAPPED; set_tsk_thread_flag(t, TIF_UPROBE); - set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); } } |