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linux-3.9.y
linux-stable/ipc
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Li Zefan 159590f26d shm: fix null pointer deref when userspace specifies invalid hugepage size 
commit 091d0d55b2 upstream.

Dave reported an oops triggered by trinity:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  IP: newseg+0x10d/0x390
  PGD cf8c1067 PUD cf8c2067 PMD 0
  Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
  CPU: 2 PID: 7636 Comm: trinity-child2 Not tainted 3.9.0+#67
  ...
  Call Trace:
    ipcget+0x182/0x380
    SyS_shmget+0x5a/0x60
    tracesys+0xdd/0xe2

This bug was introduced by commit af73e4d950 ("hugetlbfs: fix mmap
failure in unaligned size request").

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Li Zefan <lizfan@huawei.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-05-19 11:38:21 -07:00
..
compat_mq.c ipc: initialize structure memory to zero for compat functions 2010-10-27 18:03:13 -07:00
compat.c selftests: IPC message queue copy feature test 2013-01-04 16:11:45 -08:00
ipc_sysctl.c ipc: add sysctl to specify desired next object id 2013-01-04 16:11:45 -08:00
ipcns_notifier.c ipc: do not use a negative value to re-enable msgmni automatic recomputing 2008-07-25 10:53:42 -07:00
Makefile Add generic sys_ipc wrapper 2010-03-12 15:52:32 -08:00
mq_sysctl.c mqueue: separate mqueue default value from maximum value 2012-05-31 17:49:31 -07:00
mqueue.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-03-28 13:43:46 -07:00
msg.c ipc: set msg back to -EAGAIN if copy wasn't performed 2013-04-02 10:09:01 -07:00
msgutil.c ipc: fix potential oops when src msg > 4k w/ MSG_COPY 2013-03-08 15:05:33 -08:00
namespace.c userns: Require CAP_SYS_ADMIN for most uses of setns. 2012-12-14 16:12:03 -08:00
sem.c userns: Convert ipc to use kuid and kgid where appropriate 2012-09-06 22:17:20 -07:00
shm.c shm: fix null pointer deref when userspace specifies invalid hugepage size 2013-05-19 11:38:21 -07:00
syscall.c ipc: add COMPAT_SHMLBA support 2012-07-30 17:25:20 -07:00
util.c ipc: convert to idr_alloc() 2013-02-27 19:10:19 -08:00
util.h ipc: introduce message queue copy feature 2013-01-04 16:11:45 -08:00