[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 <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 7 deletions

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index b72dc31..108d56bb 100644
--- 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;
 	}