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Subject[PATCH v2 5/7] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations
Date
When fp/simd is not supported on the system, fail the operations
of FP/SIMD regsets.

Fixes: 82e0191a1aa11abf ("arm64: Support systems without FP/ASIMD")
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
arch/arm64/kernel/ptrace.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 6771c399d40c..0135b944b8db 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -637,6 +637,9 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
if (target == current)
fpsimd_preserve_current_state();

@@ -676,6 +679,9 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
{
int ret;

+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
ret = __fpr_set(target, regset, pos, count, kbuf, ubuf, 0);
if (ret)
return ret;
@@ -1348,6 +1354,9 @@ static int compat_vfp_get(struct task_struct *target,
compat_ulong_t fpscr;
int ret, vregs_end_pos;

+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
uregs = &target->thread.uw.fpsimd_state;

if (target == current)
@@ -1381,6 +1390,9 @@ static int compat_vfp_set(struct task_struct *target,
compat_ulong_t fpscr;
int ret, vregs_end_pos;

+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
uregs = &target->thread.uw.fpsimd_state;

vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t);
--
2.23.0
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