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authorMark Rutland <mark.rutland@arm.com>2017-11-02 19:12:03 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2017-11-02 21:33:08 +0300
commit7a7003b1da010d2b0d1dc8bf21c10f5c73b389f1 (patch)
tree8a89f339577c823f3b0e37d0380cdbc792046150 /arch
parent0b07194bb55ed836c2cc7c22e866b87a14681984 (diff)
downloadlinux-7a7003b1da010d2b0d1dc8bf21c10f5c73b389f1.tar.xz
arm64: ensure __dump_instr() checks addr_limit
It's possible for a user to deliberately trigger __dump_instr with a chosen kernel address. Let's avoid problems resulting from this by using get_user() rather than __get_user(), ensuring that we don't erroneously access kernel memory. Where we use __dump_instr() on kernel text, we already switch to KERNEL_DS, so this shouldn't adversely affect those cases. Fixes: 60ffc30d5652810d ("arm64: Exception handling") Cc: stable@vger.kernel.org Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/kernel/traps.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 5ea4b85aee0e..8383af15a759 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -118,7 +118,7 @@ static void __dump_instr(const char *lvl, struct pt_regs *regs)
for (i = -4; i < 1; i++) {
unsigned int val, bad;
- bad = __get_user(val, &((u32 *)addr)[i]);
+ bad = get_user(val, &((u32 *)addr)[i]);
if (!bad)
p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);