diff options
| author | Franck Bui-Huu <fbuihuu@gmail.com> | 2007-07-19 14:04:21 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-07-20 18:57:40 +0100 |
| commit | 941091024ef0f2f7e09eb81201d293ac18833cc8 (patch) | |
| tree | 8a031f67f89d29649a151d3e5275bb8aae8de8a2 | |
| parent | c55757b261038d17c729068fcdaef646a665385f (diff) | |
[MIPS] User stack pointer randomisation
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/kernel/process.c | 14 | ||||
| -rw-r--r-- | include/asm-mips/system.h | 2 |
2 files changed, 15 insertions, 1 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 8f4cf27c715..bd05f5a927e 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -25,7 +25,9 @@ #include <linux/init.h> #include <linux/completion.h> #include <linux/kallsyms.h> +#include <linux/random.h> +#include <asm/asm.h> #include <asm/bootinfo.h> #include <asm/cpu.h> #include <asm/dsp.h> @@ -460,3 +462,15 @@ unsigned long get_wchan(struct task_struct *task) out: return pc; } + +/* + * Don't forget that the stack pointer must be aligned on a 8 bytes + * boundary for 32-bits ABI and 16 bytes for 64-bits ABI. + */ +unsigned long arch_align_stack(unsigned long sp) +{ + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) + sp -= get_random_int() & ~PAGE_MASK; + + return sp & ALMASK; +} diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h index eba2e3da9ab..8d0b1cd4a45 100644 --- a/include/asm-mips/system.h +++ b/include/asm-mips/system.h @@ -470,6 +470,6 @@ extern int stop_a_enabled; */ #define __ARCH_WANT_UNLOCKED_CTXSW -#define arch_align_stack(x) (x) +extern unsigned long arch_align_stack(unsigned long sp); #endif /* _ASM_SYSTEM_H */ |