diff options
| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2020-01-13 23:30:22 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-01-14 17:11:46 +0000 |
| commit | 6d502b6ba1b267b35a70708aa0f61bbd05cf065b (patch) | |
| tree | 19237c35c3347c989b86af2652c56e4abdefc085 /arch/arm64/kernel/signal.c | |
| parent | c9d66999f064947e6b577ceacc1eb2fbca6a8d3c (diff) | |
| download | lwn-6d502b6ba1b267b35a70708aa0f61bbd05cf065b.tar.gz lwn-6d502b6ba1b267b35a70708aa0f61bbd05cf065b.zip | |
arm64: signal: nofpsimd: Handle fp/simd context for signal frames
Make sure we try to save/restore the vfp/fpsimd context for signal
handling only when the fp/simd support is available. Otherwise, skip
the frames.
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/signal.c')
| -rw-r--r-- | arch/arm64/kernel/signal.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index dd2cdc0d5be2..339882db5a91 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -371,6 +371,8 @@ static int parse_user_sigframe(struct user_ctxs *user, goto done; case FPSIMD_MAGIC: + if (!system_supports_fpsimd()) + goto invalid; if (user->fpsimd) goto invalid; @@ -506,7 +508,7 @@ static int restore_sigframe(struct pt_regs *regs, if (err == 0) err = parse_user_sigframe(&user, sf); - if (err == 0) { + if (err == 0 && system_supports_fpsimd()) { if (!user.fpsimd) return -EINVAL; @@ -623,7 +625,7 @@ static int setup_sigframe(struct rt_sigframe_user_layout *user, err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); - if (err == 0) { + if (err == 0 && system_supports_fpsimd()) { struct fpsimd_context __user *fpsimd_ctx = apply_user_offset(user, user->fpsimd_offset); err |= preserve_fpsimd_context(fpsimd_ctx); |