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| author | Dave Martin <Dave.Martin@arm.com> | 2017-06-29 16:25:49 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-06-29 18:44:08 +0200 |
| commit | 5fbd5fc49fc39ac8433da62d16682a1d0217ea4f (patch) | |
| tree | 82733204697236c0171030a6ec506782fb2d1ca0 /arch/arm64 | |
| parent | arm64: ptrace: Remove redundant overrun check from compat_vfp_set() (diff) | |
| download | linux-5fbd5fc49fc39ac8433da62d16682a1d0217ea4f.tar.xz linux-5fbd5fc49fc39ac8433da62d16682a1d0217ea4f.zip | |
arm64: ptrace: Fix incorrect get_user() use in compat_vfp_set()
Now that compat_vfp_get() uses the regset API to copy the FPSCR
value out to userspace, compat_vfp_set() looks inconsistent. In
particular, compat_vfp_set() will fail if called with kbuf != NULL
&& ubuf == NULL (which is valid usage according to the regset API).
This patch fixes compat_vfp_set() to use user_regset_copyin(),
similarly to compat_vfp_get().
This also squashes a sparse warning triggered by the cast that
drops __user when calling get_user().
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/ptrace.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 949ab6bdfbad..1b38c0150aec 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -935,15 +935,17 @@ static int compat_vfp_set(struct task_struct *target, { struct user_fpsimd_state *uregs; compat_ulong_t fpscr; - int ret; + int ret, vregs_end_pos; uregs = &target->thread.fpsimd_state.user_fpsimd; + vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, - VFP_STATE_SIZE - sizeof(compat_ulong_t)); + vregs_end_pos); if (count && !ret) { - ret = get_user(fpscr, (compat_ulong_t *)ubuf); + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpscr, + vregs_end_pos, VFP_STATE_SIZE); if (!ret) { uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK; uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK; |