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authorPaul Mackerras <paulus@samba.org>2005-05-01 08:58:42 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:42 -0700
commitd5812a77e5803468a5033be91af978be0f7a17d9 (patch)
treee01d079528be80ee78fad247b8af959b58e41d0e
parentb20cc8aff258eea5a2339107605ebea949fa6ecf (diff)
[PATCH] ppc32: Fix address checking on lmw/stmw align exception
The handling of misaligned load/store multiple instructions did not check to see if the address was ok to access before using __{get,put}_user(). Signed-off-by: Kumar Gala <kumar.gala@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ppc/kernel/align.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/ppc/kernel/align.c b/arch/ppc/kernel/align.c
index 40d356c66c4..ff81da9598d 100644
--- a/arch/ppc/kernel/align.c
+++ b/arch/ppc/kernel/align.c
@@ -290,6 +290,10 @@ fix_alignment(struct pt_regs *regs)
/* lwm, stmw */
nb = (32 - reg) * 4;
}
+
+ if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb+nb0))
+ return -EFAULT; /* bad address */
+
rptr = (unsigned char *) &regs->gpr[reg];
if (flags & LD) {
for (i = 0; i < nb; ++i)