Messages in this thread | | | Date | Thu, 09 May 2013 10:43:06 -0400 | From | Rik van Riel <> | Subject | Re: SHM oops in newseg() |
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On 05/09/2013 03:08 AM, Li Zefan wrote: > Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> > > On 2013/5/9 12:35, Dave Jones wrote: >> Just saw this on v3.9-11789-ge0fd9af while fuzz-testing. >> >> [ 163.917836] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 >> [ 163.918984] IP: [<ffffffff812c48ed>] newseg+0x10d/0x390 > > The patch below should fix it. > > =========================== > > [PATCH] shm: fix null pointer deref when userspace specifies invalid hugepage size > > Dave reported an oops triggered by trinity: > > [ 163.917836] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 > [ 163.918984] IP: [<ffffffff812c48ed>] newseg+0x10d/0x390 > [ 163.919705] PGD cf8c1067 PUD cf8c2067 PMD 0 > [ 163.920326] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 163.929949] CPU: 2 PID: 7636 Comm: trinity-child2 Not tainted 3.9.0+#67 > ... > [ 163.953629] Call Trace: > [ 163.957706] [<ffffffff812be322>] ipcget+0x182/0x380 > [ 163.962123] [<ffffffff810b99a5>] ?trace_hardirqs_on_caller+0x115/0x1e0 > [ 163.966752] [<ffffffff812c559a>] SyS_shmget+0x5a/0x60 > [ 163.971163] [<ffffffff812c47e0>] ? shm_close+0x140/0x140 > [ 163.975590] [<ffffffff812c3e60>] ? shm_release+0x50/0x50 > [ 163.979991] [<ffffffff812c3df0>] ? shm_get_unmapped_area+0x20/0x20 > [ 163.984499] [<ffffffff816caa14>] tracesys+0xdd/0xe2 > > This bug was introduced by commit af73e4d9506d3b797509f3c030e7dcd554f7d9c4 > ("hugetlbfs: fix mmap failure in unaligned size request"). > > Reported-by: Dave Jones <davej@redhat.com> > Cc: <stable@vger.kernel.org> > Signed-off-by: Li Zefan <lizfan@huawei.com>
Acked-by: Rik van Riel <riel@redhat.com>
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