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author | Mark Rutland <mark.rutland@arm.com> | 2017-11-02 16:12:03 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-08 10:03:48 +0100 |
commit | 5814e7754a0a9608ec65f3fce274ed7c2aea031b (patch) | |
tree | 3f9b1c986bcb031aa9307402108d0473bf9908bf | |
parent | 211b1914f59a95bcecefec72b952748b8166cadd (diff) | |
download | linux-rt-5814e7754a0a9608ec65f3fce274ed7c2aea031b.tar.gz |
arm64: ensure __dump_instr() checks addr_limit
commit 7a7003b1da010d2b0d1dc8bf21c10f5c73b389f1 upstream.
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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | arch/arm64/kernel/traps.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index bb8f140d24c8..27a2637543ff 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -115,7 +115,7 @@ 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); |