[POWERPC] Fix register save area alignment for swapcontext syscall

For 32-bit processes, the getcontext side of the swapcontext system
call (i.e. the saving of the context when the first argument is
non-NULL) has to set the ctx->uc_mcontext.uc_regs pointer to the place
where it saves the registers.  Which it does, but it doesn't ensure
that the pointer is 16-byte aligned.  16-byte alignment is needed
because the Altivec/VMX registers are saved in there, and they need to
be on a 16-byte boundary.

This fixes it by ensuring the appropriate alignment of the pointer.
This issue was pointed out by Jakub Jelinek.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index e4ebe1a6228e..6b405a3f43f9 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -835,11 +835,21 @@ long sys_swapcontext(struct ucontext __user *old_ctx,
                 return -EINVAL;
 
         if (old_ctx != NULL) {
+                struct mcontext __user *mctx;
+
+                /*
+                 * old_ctx might not be 16-byte aligned, in which
+                 * case old_ctx->uc_mcontext won't be either.
+                 * Because we have the old_ctx->uc_pad2 field
+                 * before old_ctx->uc_mcontext, we need to round down
+                 * from &old_ctx->uc_mcontext to a 16-byte boundary.
+                 */
+                mctx = (struct mcontext __user *)
+                        ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
                 if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
-                    || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
+                    || save_user_regs(regs, mctx, 0)
                     || put_sigset_t(&old_ctx->uc_sigmask, &current->blocked)
-                    || __put_user(to_user_ptr(&old_ctx->uc_mcontext),
-                            &old_ctx->uc_regs))
+                    || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
                         return -EFAULT;
         }
         if (new_ctx == NULL)