Capture the protection key that got violated in paca.
This value will be used by used to inform the signal
handler.
Signed-off-by: Ram Pai <linux...@us.ibm.com>
---
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/mm/fault.c | 3 +++
3 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index c8bd1fc..0c06188 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -94,6 +94,7 @@ struct paca_struct {
u64 dscr_default; /* per-CPU default DSCR */
#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
u64 paca_amr; /* value of amr at exception */
+ u16 paca_pkey; /* exception causing pkey */
#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
#ifdef CONFIG_PPC_STD_MMU_64
diff --git a/arch/powerpc/kernel/asm-offsets.c
b/arch/powerpc/kernel/asm-offsets.c
index 17f5d8a..7dff862 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -244,6 +244,7 @@ int main(void)
#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
OFFSET(PACA_AMR, paca_struct, paca_amr);
+ OFFSET(PACA_PKEY, paca_struct, paca_pkey);
#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
OFFSET(ACCOUNT_STARTTIME, paca_struct, accounting.starttime);
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index a6710f5..c8674a7 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -265,6 +265,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long
address,
if (error_code & DSISR_KEYFAULT) {
code = SEGV_PKUERR;
get_paca()->paca_amr = read_amr();
+ get_paca()->paca_pkey = get_pte_pkey(current->mm, address);
goto bad_area_nosemaphore;
}
#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
@@ -290,6 +291,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long
address,
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
+
/*
* We want to do this outside mmap_sem, because reading code around nip
* can result in fault, which will cause a deadlock when called with
@@ -453,6 +455,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long
address,
if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE,
is_exec, 0)) {
get_paca()->paca_amr = read_amr();
+ get_paca()->paca_pkey = vma_pkey(vma);
code = SEGV_PKUERR;
goto bad_area;
}
--
1.7.1
