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| author | dcashman <dcashman@google.com> | 2016-02-24 13:31:22 -0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-11 11:00:26 +0200 |
| commit | ffabe4b59ef414b92894cf5b40e4e1e59eaac011 (patch) | |
| tree | d65e021844437e09bf753357277b0a44676a3ffd /arch/arm64 | |
| parent | 576009a09a3fbf3d86c56496f62e18219ee6507c (diff) | |
| download | android_kernel_m2note-ffabe4b59ef414b92894cf5b40e4e1e59eaac011.tar.gz | |
BACKPORT: 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: Ie577b21a0678cf4b21eae06bddd8ccb27cbe70ff
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/mm/mmap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 8af07b65e..8f6bcc3f4 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -54,10 +54,10 @@ static unsigned long mmap_rnd(void) if (current->flags & PF_RANDOMIZE) { #ifdef CONFIG_COMPAT if (test_thread_flag(TIF_32BIT)) - rnd = (unsigned long)get_random_int() & ((1 << mmap_rnd_compat_bits) - 1); + rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1); else #endif - rnd = (unsigned long)get_random_int() & ((1 << mmap_rnd_bits) - 1); + rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1); } return rnd << PAGE_SHIFT; } |