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arm64/ptrace fix to use the correct SVE layout based on the saved

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floating point state rather than the TIF_SVE flag. The latter may be
 left on during syscalls even if the SVE state is discarded.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "arm64/ptrace fix to use the correct SVE layout based on the saved
  floating point state rather than the TIF_SVE flag. The latter may be
  left on during syscalls even if the SVE state is discarded"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64/ptrace: Use saved floating point state type to determine SVE layout
This commit is contained in:
Linus Torvalds 2024-04-05 13:12:35 -07:00
commit c7830236d5
1 changed files with 1 additions and 4 deletions
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5
arch/arm64/kernel/ptrace.c
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@ -761,7 +761,6 @@ static void sve_init_header_from_task(struct user_sve_header *header,
{
unsigned int vq;
bool active;
bool fpsimd_only;
enum vec_type task_type;
memset(header, 0, sizeof(*header));
@ -777,12 +776,10 @@ static void sve_init_header_from_task(struct user_sve_header *header,
case ARM64_VEC_SVE:
if (test_tsk_thread_flag(target, TIF_SVE_VL_INHERIT))
header->flags |= SVE_PT_VL_INHERIT;
fpsimd_only = !test_tsk_thread_flag(target, TIF_SVE);
break;
case ARM64_VEC_SME:
if (test_tsk_thread_flag(target, TIF_SME_VL_INHERIT))
header->flags |= SVE_PT_VL_INHERIT;
fpsimd_only = false;
break;
default:
WARN_ON_ONCE(1);
@ -790,7 +787,7 @@ static void sve_init_header_from_task(struct user_sve_header *header,
}
if (active) {
if (fpsimd_only) {
if (target->thread.fp_type == FP_STATE_FPSIMD) {
header->flags |= SVE_PT_REGS_FPSIMD;
} else {
header->flags |= SVE_PT_REGS_SVE;