[PATCH] uclinux: delay binfmt_flat trace

Modify the initial trace output (which is based on flags in the binary header) so that it is not done until after the magic number check. This may well not be a flat format binary, so the flags could be invalid. (Prime example, running a script). Changes prompted by patches from Stuart Hughs. Signed-off-by: Greg Ungerer <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
diverger · Jan 10, 2006 · 845884d · 845884d
1 parent 082f2c1
commit 845884d
Showing 1 changed file with 10 additions and 7 deletions.
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
@@ -442,19 +442,22 @@ static int load_flat_file(struct linux_binprm * bprm,
 	flags     = ntohl(hdr->flags);
 	rev       = ntohl(hdr->rev);
 
-	if (flags & FLAT_FLAG_KTRACE)
-		printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
-
-	if (strncmp(hdr->magic, "bFLT", 4) ||
-			(rev != FLAT_VERSION && rev != OLD_FLAT_VERSION)) {
+	if (strncmp(hdr->magic, "bFLT", 4)) {
 		/*
 		 * because a lot of people do not manage to produce good
 		 * flat binaries,  we leave this printk to help them realise
 		 * the problem.  We only print the error if its not a script file
 		 */
 		if (strncmp(hdr->magic, "#!", 2))
-			printk("BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
-					rev, (int) FLAT_VERSION);
+			printk("BINFMT_FLAT: bad header magic\n");
+		return -ENOEXEC;
+	}
+
+	if (flags & FLAT_FLAG_KTRACE)
+		printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
+
+	if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
+		printk("BINFMT_FLAT: bad flat file version 0x%x (supported 0x%x and 0x%x)\n", rev, FLAT_VERSION, OLD_FLAT_VERSION);
 		return -ENOEXEC;
 	}