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| author |   David Howells <dhowells@redhat.com> | 2010-08-04 16:59:14 +0100 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-04 11:17:10 -0700 |
| commit | 694f690d27dadccc8cb9d90532e76593b61fe098 (patch) | |
| tree | ea641e53ae530d0d3708fbfcab8109cc5e840d21 /arch/x86/kernel/cpu/mcheck/mce.c | |
| parent | block_dev: always serialize exclusive open attempts (diff) | |
| download | linux-dev-694f690d27dadccc8cb9d90532e76593b61fe098.tar.xz linux-dev-694f690d27dadccc8cb9d90532e76593b61fe098.zip | |
CRED: Fix RCU warning due to previous patch fixing __task_cred()'s checks
Commit 8f92054e7ca1 ("CRED: Fix __task_cred()'s lockdep check and banner
comment") fixed the lockdep checks on __task_cred(). This has shown up
a place in the signalling code where a lock should be held - namely that
check_kill_permission() requires its callers to hold the RCU lock.
Fix group_send_sig_info() to get the RCU read lock around its call to
check_kill_permission().
Without this patch, the following warning can occur:
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
kernel/signal.c:660 invoked rcu_dereference_check() without protection!
...
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/cpu/mcheck/mce.c')
0 files changed, 0 insertions, 0 deletions