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arm64: signal: nofpsimd: Handle fp/simd context for signal frames

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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>
This commit is contained in:
Suzuki K Poulose 2020-01-13 23:30:22 +00:00 • committed by Will Deacon
parent c9d66999f0
commit 6d502b6ba1
2 changed files with 6 additions and 4 deletions
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6
arch/arm64/kernel/signal.c
View file

@ -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);

4
arch/arm64/kernel/signal32.c
View file

@ -223,7 +223,7 @@ static int compat_restore_sigframe(struct pt_regs *regs,
err |= !valid_user_regs(&regs->user_regs, current);
aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
if (err == 0)
if (err == 0 && system_supports_fpsimd())
err |= compat_restore_vfp_context(&aux->vfp);
return err;
@ -419,7 +419,7 @@ static int compat_setup_sigframe(struct compat_sigframe __user *sf,
aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
if (err == 0)
if (err == 0 && system_supports_fpsimd())
err |= compat_preserve_vfp_context(&aux->vfp);
__put_user_error(0, &aux->end_magic, err);