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| author | Oleg Nesterov | 2012-04-09 21:03:50 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-04-11 17:20:11 +0200 |
| commit | 79549c6dfda0603dba9a70a53467ce62d9335c33 (patch) | |
| tree | 88de05761354d81916b6a929ae9ef2fa1b51e3e5 /arch/x86/lib/usercopy.c | |
| parent | Smack: build when CONFIG_AUDIT not defined (diff) | |
| download | kernel-qcow2-linux-79549c6dfda0603dba9a70a53467ce62d9335c33.tar.gz kernel-qcow2-linux-79549c6dfda0603dba9a70a53467ce62d9335c33.tar.xz kernel-qcow2-linux-79549c6dfda0603dba9a70a53467ce62d9335c33.zip | |
cred: copy_process() should clear child->replacement_session_keyring
keyctl_session_to_parent(task) sets ->replacement_session_keyring,
it should be processed and cleared by key_replace_session_keyring().
However, this task can fork before it notices TIF_NOTIFY_RESUME and
the new child gets the bogus ->replacement_session_keyring copied by
dup_task_struct(). This is obviously wrong and, if nothing else, this
leads to put_cred(already_freed_cred).
change copy_creds() to clear this member. If copy_process() fails
before this point the wrong ->replacement_session_keyring doesn't
matter, exit_creds() won't be called.
Cc: <stable@vger.kernel.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/lib/usercopy.c')
0 files changed, 0 insertions, 0 deletions