From: Chris Snook <[email protected]>
Add SEEK_MAX and use it to validate lseek arguments from userspace.
Signed-off-by: Chris Snook <[email protected]>
--
diff -urp b/fs/read_write.c c/fs/read_write.c
--- b/fs/read_write.c 2007-02-20 16:48:39.000000000 -0500
+++ c/fs/read_write.c 2007-02-20 16:55:46.000000000 -0500
@@ -139,7 +139,7 @@ asmlinkage off_t sys_lseek(unsigned int
goto bad;
retval = -EINVAL;
- if (origin <= 2) {
+ if (origin <= SEEK_MAX) {
loff_t res = vfs_llseek(file, offset, origin);
retval = res;
if (res != (loff_t)retval)
@@ -166,7 +166,7 @@ asmlinkage long sys_llseek(unsigned int
goto bad;
retval = -EINVAL;
- if (origin > 2)
+ if (origin > SEEK_MAX)
goto out_putf;
offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low,
diff -urp b/include/linux/fs.h c/include/linux/fs.h
--- b/include/linux/fs.h 2007-02-20 14:49:46.000000000 -0500
+++ c/include/linux/fs.h 2007-02-20 16:54:30.000000000 -0500
@@ -30,6 +30,7 @@
#define SEEK_SET 0 /* seek relative to beginning of file */
#define SEEK_CUR 1 /* seek relative to current file position */
#define SEEK_END 2 /* seek relative to end of file */
+#define SEEK_MAX SEEK_END
/* And dynamically-tunable limits and defaults: */
struct files_stat_struct {
-
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