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| author | Bernd Edlinger <bernd.edlinger@hotmail.de> | 2021-06-07 16:54:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-03 17:57:49 +0300 |
| commit | 9ba2990f4e8027256e2f24d361e44e987246949f (patch) | |
| tree | 65514717793d2372cbca158870f184e620e777d3 /fs/exec.c | |
| parent | 706215300411d48db6b51a5832b872632a84bbc1 (diff) | |
| download | linux-9ba2990f4e8027256e2f24d361e44e987246949f.tar.xz | |
exec: Copy oldsighand->action under spin-lock
commit 5bf2fedca8f59379025b0d52f917b9ddb9bfe17e upstream.
unshare_sighand should only access oldsighand->action
while holding oldsighand->siglock, to make sure that
newsighand->action is in a consistent state.
Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Cc: stable@vger.kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/AM8PR10MB470871DEBD1DED081F9CC391E4389@AM8PR10MB4708.EURPRD10.PROD.OUTLOOK.COM
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c index b56bc4b4016e..983295c0b8ac 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1198,11 +1198,11 @@ static int unshare_sighand(struct task_struct *me) return -ENOMEM; refcount_set(&newsighand->count, 1); - memcpy(newsighand->action, oldsighand->action, - sizeof(newsighand->action)); write_lock_irq(&tasklist_lock); spin_lock(&oldsighand->siglock); + memcpy(newsighand->action, oldsighand->action, + sizeof(newsighand->action)); rcu_assign_pointer(me->sighand, newsighand); spin_unlock(&oldsighand->siglock); write_unlock_irq(&tasklist_lock); |