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/powerpc/kernel/process.c | |
| 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/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 646bf4d222c1..a7b91b54c813 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1641,9 +1641,9 @@ static inline unsigned long brk_rnd(void) /* 8MB for 32bit, 1GB for 64bit */ if (is_32bit_task()) - rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT))); + rnd = (get_random_long() % (1UL<<(23-PAGE_SHIFT))); else - rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT))); + rnd = (get_random_long() % (1UL<<(30-PAGE_SHIFT))); return rnd << PAGE_SHIFT; } |