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arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations

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When fp/simd is not supported on the system, fail the operations
of FP/SIMD regsets.

Fixes: 82e0191a1a ("arm64: Support systems without FP/ASIMD")
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 23:30:21 +00:00 committed by Will Deacon
parent 7559950aef
commit c9d66999f0
1 changed files with 21 additions and 0 deletions
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21
arch/arm64/kernel/ptrace.c
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@ -615,6 +615,13 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
return 0; return 0;
} }
static int fpr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!system_supports_fpsimd())
return -ENODEV;
return regset->n;
}
/* /*
* TODO: update fp accessors for lazy context switching (sync/flush hwstate) * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
*/ */
@ -637,6 +644,9 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf) void *kbuf, void __user *ubuf)
{ {
if (!system_supports_fpsimd())
return -EINVAL;
if (target == current) if (target == current)
fpsimd_preserve_current_state(); fpsimd_preserve_current_state();
@ -676,6 +686,9 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
{ {
int ret; int ret;
if (!system_supports_fpsimd())
return -EINVAL;
ret = __fpr_set(target, regset, pos, count, kbuf, ubuf, 0); ret = __fpr_set(target, regset, pos, count, kbuf, ubuf, 0);
if (ret) if (ret)
return ret; return ret;
@ -1134,6 +1147,7 @@ static const struct user_regset aarch64_regsets[] = {
*/ */
.size = sizeof(u32), .size = sizeof(u32),
.align = sizeof(u32), .align = sizeof(u32),
.active = fpr_active,
.get = fpr_get, .get = fpr_get,
.set = fpr_set .set = fpr_set
}, },
@ -1348,6 +1362,9 @@ static int compat_vfp_get(struct task_struct *target,
compat_ulong_t fpscr; compat_ulong_t fpscr;
int ret, vregs_end_pos; int ret, vregs_end_pos;
if (!system_supports_fpsimd())
return -EINVAL;
uregs = &target->thread.uw.fpsimd_state; uregs = &target->thread.uw.fpsimd_state;
if (target == current) if (target == current)
@ -1381,6 +1398,9 @@ static int compat_vfp_set(struct task_struct *target,
compat_ulong_t fpscr; compat_ulong_t fpscr;
int ret, vregs_end_pos; int ret, vregs_end_pos;
if (!system_supports_fpsimd())
return -EINVAL;
uregs = &target->thread.uw.fpsimd_state; uregs = &target->thread.uw.fpsimd_state;
vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t); vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t);
@ -1438,6 +1458,7 @@ static const struct user_regset aarch32_regsets[] = {
.n = VFP_STATE_SIZE / sizeof(compat_ulong_t), .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
.size = sizeof(compat_ulong_t), .size = sizeof(compat_ulong_t),
.align = sizeof(compat_ulong_t), .align = sizeof(compat_ulong_t),
.active = fpr_active,
.get = compat_vfp_get, .get = compat_vfp_get,
.set = compat_vfp_set .set = compat_vfp_set
}, },