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shm: fix null pointer deref when userspace specifies invalid hugepage size

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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 <[email protected]>
Cc: <[email protected]>
Signed-off-by: Li Zefan <[email protected]>
Reviewed-by: Naoya Horiguchi <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Li Zefan 2013-05-09 15:08:15 +08:00 • committed by Linus Torvalds
commit 091d0d55b2
2 changed files with 13 additions and 3 deletions
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8
mm/mmap.c
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@ -1367,9 +1367,13 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
len = ALIGN(len, huge_page_size(hstate_file(file)));
} else if (flags & MAP_HUGETLB) {
struct user_struct *user = NULL;
struct hstate *hs = hstate_sizelog((flags >> MAP_HUGE_SHIFT) &
SHM_HUGE_MASK);
len = ALIGN(len, huge_page_size(hstate_sizelog(
(flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)));
if (!hs)
return -EINVAL;
len = ALIGN(len, huge_page_size(hs));
/*
* VM_NORESERVE is used because the reservations will be
* taken when vm_ops->mmap() is called