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| author |   James Morse <james.morse@arm.com> | 2016-06-20 18:28:01 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-07-07 15:55:37 +0100 |
| commit | e19a6ee2460bdd0d0055a6029383422773f9999a (patch) | |
| tree | f8e7898101568c82617d7afd66e712b9f0538a0e /arch/arm64/include/asm/ptrace.h | |
| parent | Linux 4.7-rc5 (diff) | |
| download | linux-dev-e19a6ee2460bdd0d0055a6029383422773f9999a.tar.xz linux-dev-e19a6ee2460bdd0d0055a6029383422773f9999a.zip | |
arm64: kernel: Save and restore UAO and addr_limit on exception entry
If we take an exception while at EL1, the exception handler inherits
the original context's addr_limit and PSTATE.UAO values. To be consistent
always reset addr_limit and PSTATE.UAO on (re-)entry to EL1. This
prevents accidental re-use of the original context's addr_limit.
Based on a similar patch for arm from Russell King.
Cc: <stable@vger.kernel.org> # 4.6-
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/ptrace.h')
| -rw-r--r-- | arch/arm64/include/asm/ptrace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index a307eb6e7fa8..7f94755089e2 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -117,6 +117,8 @@ struct pt_regs { }; u64 orig_x0; u64 syscallno; + u64 orig_addr_limit; + u64 unused; // maintain 16 byte alignment }; #define arch_has_single_step() (1) |