vboxfs: fix broken legacy mount signature checking

[ Upstream commit 9b3b353ef330e20bc2d99bf3165cc044cff26a09 ]

Commit 9d682ea6bcc7 ("vboxsf: Fix the check for the old binary
mount-arguments struct") was meant to fix a build error due to sign
mismatch in 'char' and the use of character constants, but it just moved
the error elsewhere, in that on some architectures characters and signed
and on others they are unsigned, and that's just how the C standard
works.

The proper fix is a simple "don't do that then".  The code was just
being silly and odd, and it should never have cared about signed vs
unsigned characters in the first place, since what it is testing is not
four "characters", but four bytes.

And the way to compare four bytes is by using "memcmp()".

Which compilers will know to just turn into a single 32-bit compare with
a constant, as long as you don't have crazy debug options enabled.

Link: https://lore.kernel.org/lkml/20210927094123.576521-1-arnd@kernel.org/
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c
index d7816c01a4f62885f505001a752a80b2700dd82a..c578e772cbd58b8b614953ce12c52358590ba277 100644 (file)
--- a/fs/vboxsf/super.c
+++ b/fs/vboxsf/super.c
@@ -21,10 +21,7 @@
 
 #define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */
 
-#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\000')
-#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\377')
-#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\376')
-#define VBSF_MOUNT_SIGNATURE_BYTE_3 ('\375')
+static const unsigned char VBSF_MOUNT_SIGNATURE[4] = "\000\377\376\375";
 
 static int follow_symlinks;
 module_param(follow_symlinks, int, 0444);
@@ -386,12 +383,7 @@ static int vboxsf_setup(void)
 
 static int vboxsf_parse_monolithic(struct fs_context *fc, void *data)
 {
-       unsigned char *options = data;
-
-       if (options && options[0] == VBSF_MOUNT_SIGNATURE_BYTE_0 &&
-                      options[1] == VBSF_MOUNT_SIGNATURE_BYTE_1 &&
-                      options[2] == VBSF_MOUNT_SIGNATURE_BYTE_2 &&
-                      options[3] == VBSF_MOUNT_SIGNATURE_BYTE_3) {
+       if (data && !memcmp(data, VBSF_MOUNT_SIGNATURE, 4)) {
                vbg_err("vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.\n");
                return -EINVAL;
        }