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author | 2009-09-19 11:27:32 +0200 | |
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committer | 2009-09-19 11:28:41 +0200 | |
commit | 929bf0d0156562ce631728b6fa53d68004d456d2 (patch) | |
tree | 739063990a8077b29ef97e69d73bce94573daae4 /arch/x86/mm/mmap.c | |
parent | sched_clock: Make it NMI safe (diff) | |
parent | pty_write: don't do a tty_wakeup() when the buffers are full (diff) | |
download | linux-dev-929bf0d0156562ce631728b6fa53d68004d456d2.tar.xz linux-dev-929bf0d0156562ce631728b6fa53d68004d456d2.zip |
Merge branch 'linus' into perfcounters/core
Merge reason: Bring in tracing changes we depend on.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/mmap.c')
-rw-r--r-- | arch/x86/mm/mmap.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c index 165829600566..c8191defc38a 100644 --- a/arch/x86/mm/mmap.c +++ b/arch/x86/mm/mmap.c @@ -29,13 +29,26 @@ #include <linux/random.h> #include <linux/limits.h> #include <linux/sched.h> +#include <asm/elf.h> + +static unsigned int stack_maxrandom_size(void) +{ + unsigned int max = 0; + if ((current->flags & PF_RANDOMIZE) && + !(current->personality & ADDR_NO_RANDOMIZE)) { + max = ((-1U) & STACK_RND_MASK) << PAGE_SHIFT; + } + + return max; +} + /* * Top of mmap area (just below the process stack). * - * Leave an at least ~128 MB hole. + * Leave an at least ~128 MB hole with possible stack randomization. */ -#define MIN_GAP (128*1024*1024) +#define MIN_GAP (128*1024*1024UL + stack_maxrandom_size()) #define MAX_GAP (TASK_SIZE/6*5) /* |