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| author | David Engraf <david.engraf@sysgo.com> | 2022-02-25 11:40:08 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-03-07 22:38:25 +0100 |
| commit | 0a32c88ddb9af30e8a16d41d7b9b824c27d29459 (patch) | |
| tree | a4a05b2bcc23ce6d7634bb81ea267b571f17feab | |
| parent | arm64: cpufeature: Always specify and use a field width for capabilities (diff) | |
| download | linux-0a32c88ddb9af30e8a16d41d7b9b824c27d29459.tar.xz linux-0a32c88ddb9af30e8a16d41d7b9b824c27d29459.zip | |
arm64: signal: nofpsimd: Do not allocate fp/simd context when not available
Commit 6d502b6ba1b2 ("arm64: signal: nofpsimd: Handle fp/simd context for
signal frames") introduced saving the fp/simd context for signal handling
only when support is available. But setup_sigframe_layout() always
reserves memory for fp/simd context. The additional memory is not touched
because preserve_fpsimd_context() is not called and thus the magic is
invalid.
This may lead to an error when parse_user_sigframe() checks the fp/simd
area and does not find a valid magic number.
Signed-off-by: David Engraf <david.engraf@sysgo.com>
Reviwed-by: Mark Brown <broonie@kernel.org>
Fixes: 6d502b6ba1b267b3 ("arm64: signal: nofpsimd: Handle fp/simd context for signal frames")
Cc: <stable@vger.kernel.org> # 5.6.x
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220225104008.820289-1-david.engraf@sysgo.com
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/arm64/kernel/signal.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index d8aaf4b6f432..3d66fba69016 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -577,10 +577,12 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user, { int err; - err = sigframe_alloc(user, &user->fpsimd_offset, - sizeof(struct fpsimd_context)); - if (err) - return err; + if (system_supports_fpsimd()) { + err = sigframe_alloc(user, &user->fpsimd_offset, + sizeof(struct fpsimd_context)); + if (err) + return err; + } /* fault information, if valid */ if (add_all || current->thread.fault_code) { |