From: Balbir Singh <bsingharora@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Subject: [powerpc v4 2/3] Detect instruction fetch denied and report
Date: Mon, 14 Nov 2016 16:25:11 +1100 [thread overview]
Message-ID: <1479101112-21120-3-git-send-email-bsingharora@gmail.com> (raw)
In-Reply-To: <1479101112-21120-1-git-send-email-bsingharora@gmail.com>
ISA 3 allows for prevention of instruction fetch and execution
of user mode pages. If such an error occurs, SRR1 bit 35
reports the error. We catch and report the error in do_page_fault()
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
---
arch/powerpc/mm/fault.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index d0b137d..1e7ff7b 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -404,6 +404,10 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
(cpu_has_feature(CPU_FTR_NOEXECUTE) ||
!(vma->vm_flags & (VM_READ | VM_WRITE))))
goto bad_area;
+
+ if (regs->msr & SRR1_ISI_N_OR_G)
+ goto bad_area;
+
#ifdef CONFIG_PPC_STD_MMU
/*
* protfault should only happen due to us
--
2.5.5
next prev parent reply other threads:[~2016-11-14 5:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 5:25 [powerpc v4 0/3] Enable IAMR storage keys for radix Balbir Singh
2016-11-14 5:25 ` [powerpc v4 1/3] Setup AMOR in HV mode Balbir Singh
2016-11-14 11:09 ` kbuild test robot
2016-11-15 2:30 ` Michael Ellerman
2016-11-14 5:25 ` Balbir Singh [this message]
2016-11-14 5:25 ` [powerpc v4 3/3] Enable storage keys for radix - user mode execution Balbir Singh
2016-11-14 13:43 ` kbuild test robot
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