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authorAl Viro <viro@zeniv.linux.org.uk>2017-05-03 02:52:17 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-04 01:44:02 +0300
commit468138d78510688fb5476f98d23f11ac6a63229a (patch)
tree5f235bc85343bf3f314201a1d281881625d67abe /arch/arm
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff)
downloadlinux-468138d78510688fb5476f98d23f11ac6a63229a.tar.xz
binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail
on MMU targets EFAULT is possible here. Make both return 0 or error, passing what used to be the return value of flat_get_addr_from_rp() by reference. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/flat.h25
1 files changed, 22 insertions, 3 deletions
diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index acf1d14b89a6..29d3a1524bce 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -5,12 +5,31 @@
#ifndef __ARM_FLAT_H__
#define __ARM_FLAT_H__
+#include <linux/uaccess.h>
+
#define flat_argvp_envp_on_stack() 1
#define flat_old_ram_flag(flags) (flags)
#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
-#define flat_get_addr_from_rp(rp, relval, flags, persistent) \
- ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
-#define flat_put_addr_at_rp(rp, val, relval) __put_user_unaligned(val, rp)
+
+static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
+ u32 *addr, u32 *persistent)
+{
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+ return copy_from_user(addr, rp, 4) ? -EFAULT : 0;
+#else
+ return get_user(*addr, rp);
+#endif
+}
+
+static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
+{
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+ return copy_to_user(rp, &addr, 4) ? -EFAULT : 0;
+#else
+ return put_user(addr, rp);
+#endif
+}
+
#define flat_get_relocate_addr(rel) (rel)
#define flat_set_persistent(relval, p) 0