diff options
| author | dcashman <dcashman@google.com> | 2016-02-24 13:31:22 -0800 |
|---|---|---|
| committer | Dmitry Shmidt <dimitrysh@google.com> | 2016-03-16 16:50:34 -0700 |
| commit | b471fcdaec3d419ddcbe416568f3f9ce7f1e9ef8 (patch) | |
| tree | a846f76ac7355667d29dfb8ad1b0ae8493738f79 /arch/arm | |
| parent | 9a3fe392e468775da2b63a813f60b923eb6476c5 (diff) | |
FROMLIST: mm: ASLR: use get_random_long()
(cherry picked from commit https://lkml.org/lkml/2016/2/4/833)
Replace calls to get_random_int() followed by a cast to (unsigned long)
with calls to get_random_long(). Also address shifting bug which, in case
of x86 removed entropy mask for mmap_rnd_bits values > 31 bits.
Bug: 26963541
Signed-off-by: Daniel Cashman <dcashman@android.com>
Signed-off-by: Daniel Cashman <dcashman@google.com>
Change-Id: I36c156c9b8d7d157134895fddd4cd6efddcbee86
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mm/mmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 4b4058db0781..66353caa35b9 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -173,7 +173,7 @@ unsigned long arch_mmap_rnd(void) { unsigned long rnd; - rnd = (unsigned long)get_random_int() & ((1 << mmap_rnd_bits) - 1); + rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1); return rnd << PAGE_SHIFT; } |