FLAT binaries: drop BINFMT_FLAT bad header magic warning

The warning issued by fs/binfmt_flat.c when the format handler is given a
non-FLAT and non-script executable is annoying to say the least when working
with FDPIC ELF objects.  If you build a kernel that supports both FLAT and
FDPIC ELFs on no-mmu, every time you execute an FDPIC ELF, the kernel spits
out this message.  While I understand a lot of newcomers to the no-mmu world
screw up generation of FLAT binaries, this warning is not usable for systems
that support more than just FLAT.

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Bernd Schmidt <bernds_cb1@t-online.de>
Acked-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index d8a02f1..0498b18 100644 (file)
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -443,12 +443,12 @@ static int load_flat_file(struct linux_binprm * bprm,
 
        if (strncmp(hdr->magic, "bFLT", 4)) {
                /*
+                * Previously, here was a printk to tell people
+                *   "BINFMT_FLAT: bad header magic".
+                * But for the kernel which also use ELF FD-PIC format, this
+                * error message is confusing.
                 * 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 header magic\n");
                ret = -ENOEXEC;
                goto err;
        }