Merge tag 'parisc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6

torvalds · torvalds · commit b80d60e1c385 · 2012-11-22T09:16:29.000-10:00
Pull PARISC fixes from James Bottomley:
 "This is two bug fixes: one fixes a loophole where rt_sigprocmask()
  with the wrong values panics the box (Denial of Service) and the other
  fixes an aliasing problem with get_shared_area() which could cause
  data corruption.

  Signed-off-by: James Bottomley &lt;JBottomley@Parallels.com&gt;"

* tag 'parisc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6:
  [PARISC] fix user-triggerable panic on parisc
  [PARISC] fix virtual aliasing issue in get_shared_area()
diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c
@@ -65,7 +65,8 @@ put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
 {
 	compat_sigset_t s;
 
-	if (sz != sizeof *set) panic("put_sigset32()");
+	if (sz != sizeof *set)
+		return -EINVAL;
 	sigset_64to32(&s, set);
 
 	return copy_to_user(up, &s, sizeof s);
@@ -77,7 +78,8 @@ get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
 	compat_sigset_t s;
 	int r;
 
-	if (sz != sizeof *set) panic("put_sigset32()");
+	if (sz != sizeof *set)
+		return -EINVAL;
 
 	if ((r = copy_from_user(&s, up, sz)) == 0) {
 		sigset_32to64(set, &s);
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
@@ -73,6 +73,8 @@ static unsigned long get_shared_area(struct address_space *mapping,
 	struct vm_area_struct *vma;
 	int offset = mapping ? get_offset(mapping) : 0;
 
+	offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000;
+
 	addr = DCACHE_ALIGN(addr - offset) + offset;
 
 	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
