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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/include/asm/paca.h | |
| parent | c3ff2a5193fa61b1b284cfb1d79628814ed0e95a (diff) | |
| download | linux-06ec27aea9fc84d9c6d879eb64b5bcf28a8a1eb7.tar.bz2 | |
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/include/asm/paca.h')
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index 7b6e23af3808..c6d01f0aa898 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -256,6 +256,9 @@ struct paca_struct { struct slb_entry *mce_faulty_slbs; u16 slb_save_cache_ptr; #endif /* CONFIG_PPC_BOOK3S_64 */ +#ifdef CONFIG_STACKPROTECTOR + unsigned long canary; +#endif } ____cacheline_aligned; extern void copy_mm_to_paca(struct mm_struct *mm); |