diff options
| author | David Engraf <david.engraf@sysgo.com> | 2022-02-25 13:40:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:22:57 +0300 |
| commit | 556e8e0a27c80ba33c52a3554008595522cb9999 (patch) | |
| tree | 2dc9e44b0ab8f24ca56cae387a1c54b3340b8372 /arch/arm64 | |
| parent | e04a1de51cf66f2c91ac1178faeb12af7a130ac0 (diff) | |
| download | linux-556e8e0a27c80ba33c52a3554008595522cb9999.tar.xz | |
arm64: signal: nofpsimd: Do not allocate fp/simd context when not available
commit 0a32c88ddb9af30e8a16d41d7b9b824c27d29459 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64')
| -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 c287b9407f28..981f0c4157c2 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) { |