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Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c33
1 files changed, 15 insertions, 18 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index c6a8f2326b6..e132891d3ce 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -74,7 +74,8 @@ static const char fmt64[] = KERN_INFO \
*/
static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- int signr, sigset_t *set, unsigned long handler)
+ int signr, sigset_t *set, unsigned long handler,
+ int ctx_has_vsx_region)
{
/* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
* process never used altivec yet (MSR_VEC is zero in pt_regs of
@@ -121,7 +122,7 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
* then out to userspace. Update v_regs to point after the
* VMX data.
*/
- if (current->thread.used_vsr) {
+ if (current->thread.used_vsr && ctx_has_vsx_region) {
__giveup_vsx(current);
v_regs += ELF_NVRREG;
err |= copy_vsx_to_user(v_regs, current);
@@ -282,9 +283,10 @@ int sys_swapcontext(struct ucontext __user *old_ctx,
unsigned char tmp;
sigset_t set;
unsigned long new_msr = 0;
+ int ctx_has_vsx_region = 0;
if (new_ctx &&
- __get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
+ get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
return -EFAULT;
/*
* Check that the context is not smaller than the original
@@ -299,28 +301,23 @@ int sys_swapcontext(struct ucontext __user *old_ctx,
if ((ctx_size < sizeof(struct ucontext)) &&
(new_msr & MSR_VSX))
return -EINVAL;
-#ifdef CONFIG_VSX
- /*
- * If userspace doesn't provide enough room for VSX data,
- * but current thread has used VSX, we don't have anywhere
- * to store the full context back into.
- */
- if ((ctx_size < sizeof(struct ucontext)) &&
- (current->thread.used_vsr && old_ctx))
- return -EINVAL;
-#endif
+ /* Does the context have enough room to store VSX data? */
+ if (ctx_size >= sizeof(struct ucontext))
+ ctx_has_vsx_region = 1;
+
if (old_ctx != NULL) {
- if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
- || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0)
+ if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
+ || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
+ ctx_has_vsx_region)
|| __copy_to_user(&old_ctx->uc_sigmask,
&current->blocked, sizeof(sigset_t)))
return -EFAULT;
}
if (new_ctx == NULL)
return 0;
- if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
+ if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
|| __get_user(tmp, (u8 __user *) new_ctx)
- || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
+ || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
return -EFAULT;
/*
@@ -423,7 +420,7 @@ int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL,
- (unsigned long)ka->sa.sa_handler);
+ (unsigned long)ka->sa.sa_handler, 1);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto badframe;