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Subject[PATCH 4.14 012/237] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations
Date
From: Suzuki K Poulose <suzuki.poulose@arm.com>

commit c9d66999f064947e6b577ceacc1eb2fbca6a8d3c upstream

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

Cc: stable@vger.kernel.org # v4.14
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: Sasha Levin <sashal@kernel.org>
---
arch/arm64/kernel/ptrace.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 242527f29c410..e230b4dff9602 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -624,6 +624,13 @@ static int gpr_set(struct task_struct *target, const struct user_regset *regset,
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)
*/
@@ -634,6 +641,9 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
struct user_fpsimd_state *uregs;
uregs = &target->thread.fpsimd_state.user_fpsimd;

+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
if (target == current)
fpsimd_preserve_current_state();

@@ -648,6 +658,9 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
struct user_fpsimd_state newstate =
target->thread.fpsimd_state.user_fpsimd;

+ if (!system_supports_fpsimd())
+ return -EINVAL;
+
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
if (ret)
return ret;
@@ -740,6 +753,7 @@ static const struct user_regset aarch64_regsets[] = {
*/
.size = sizeof(u32),
.align = sizeof(u32),
+ .active = fpr_active,
.get = fpr_get,
.set = fpr_set
},
@@ -914,6 +928,9 @@ 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.fpsimd_state.user_fpsimd;

if (target == current)
@@ -947,6 +964,9 @@ 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.fpsimd_state.user_fpsimd;

vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t);
@@ -1004,6 +1024,7 @@ static const struct user_regset aarch32_regsets[] = {
.n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
.size = sizeof(compat_ulong_t),
.align = sizeof(compat_ulong_t),
+ .active = fpr_active,
.get = compat_vfp_get,
.set = compat_vfp_set
},
--
2.20.1


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