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powerpc/64: add stack protector support

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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>
This commit is contained in:
Christophe Leroy 2018-09-27 07:05:55 +00:00 • committed by Michael Ellerman
parent c3ff2a5193
commit 06ec27aea9
6 changed files with 23 additions and 1 deletions
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3
arch/powerpc/include/asm/paca.h
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@ -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);