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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2018-09-27 07:05:55 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-03 15:40:03 +1000 |
| commit | 06ec27aea9fc84d9c6d879eb64b5bcf28a8a1eb7 (patch) | |
| tree | 74bcc3ec9f8ea5647aead31b19d287f720fd0ab5 /arch/powerpc/kernel/asm-offsets.c | |
| parent | c3ff2a5193fa61b1b284cfb1d79628814ed0e95a (diff) | |
| download | linux-06ec27aea9fc84d9c6d879eb64b5bcf28a8a1eb7.tar.gz | |
powerpc/64: add stack protector support
On PPC64, as register r13 points to the paca_struct at all time,
this patch adds a copy of the canary there, which is copied at
task_switch.
That new canary is then used by using the following GCC options:
-mstack-protector-guard=tls
-mstack-protector-guard-reg=r13
-mstack-protector-guard-offset=offsetof(struct paca_struct, canary))
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/asm-offsets.c')
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 9e9ee168e177e5..a6d70fd2e49924 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -81,6 +81,9 @@ int main(void) OFFSET(MM, task_struct, mm); #ifdef CONFIG_STACKPROTECTOR OFFSET(TASK_CANARY, task_struct, stack_canary); +#ifdef CONFIG_PPC64 + OFFSET(PACA_CANARY, paca_struct, canary); +#endif #endif OFFSET(MMCONTEXTID, mm_struct, context.id); #ifdef CONFIG_PPC64 |