binfmt_misc: add comments & debug logs

When trying to develop a custom format handler, the errors returned all
effectively get bucketed as EINVAL with no kernel messages.  The other
errors (ENOMEM/EFAULT) are internal/obvious and basic.  Thus any time a
bad handler is rejected, the developer has to walk the dense code and
try to guess where it went wrong.  Needing to dive into kernel code is
itself a fairly high barrier for a lot of people.

To improve this situation, let's deploy extensive pr_debug markers at
logical parse points, and add comments to the dense parsing logic.  It
let's you see exactly where the parsing aborts, the string the kernel
received (useful when dealing with shell code), how it translated the
buffers to binary data, and how it will apply the mask at runtime.

Some example output:
  $ echo ':qemu-foo:M::\x7fELF\xAD\xAD\x01\x00:\xff\xff\xff\xff\xff\x00\xff\x00:/usr/bin/qemu-foo:POC' > register
  $ dmesg
  binfmt_misc: register: received 92 bytes
  binfmt_misc: register: delim: 0x3a {:}
  binfmt_misc: register: name: {qemu-foo}
  binfmt_misc: register: type: M (magic)
  binfmt_misc: register: offset: 0x0
  binfmt_misc: register: magic[raw]: 5c 78 37 66 45 4c 46 5c 78 41 44 5c 78 41 44 5c  \x7fELF\xAD\xAD\
  binfmt_misc: register: magic[raw]: 78 30 31 5c 78 30 30 00                          x01\x00.
  binfmt_misc: register:  mask[raw]: 5c 78 66 66 5c 78 66 66 5c 78 66 66 5c 78 66 66  \xff\xff\xff\xff
  binfmt_misc: register:  mask[raw]: 5c 78 66 66 5c 78 30 30 5c 78 66 66 5c 78 30 30  \xff\x00\xff\x00
  binfmt_misc: register:  mask[raw]: 00                                               .
  binfmt_misc: register: magic/mask length: 8
  binfmt_misc: register: magic[decoded]: 7f 45 4c 46 ad ad 01 00                          .ELF....
  binfmt_misc: register:  mask[decoded]: ff ff ff ff ff 00 ff 00                          ........
  binfmt_misc: register:  magic[masked]: 7f 45 4c 46 ad 00 01 00                          .ELF....
  binfmt_misc: register: interpreter: {/usr/bin/qemu-foo}
  binfmt_misc: register: flag: P (preserve argv0)
  binfmt_misc: register: flag: O (open binary)
  binfmt_misc: register: flag: C (preserve creds)

The [raw] lines show us exactly what was received from userspace.  The
lines after that show us how the kernel has decoded things.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 121 insertions, 15 deletions

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 1cc5377ba955..d87ddc7c4b14 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -16,6 +16,8 @@
  *  2001-02-28 AV: rewritten into something that resembles C. Original didn't.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/sched.h>
@@ -30,8 +32,13 @@
 #include <linux/mount.h>
 #include <linux/syscalls.h>
 #include <linux/fs.h>
+#include <linux/uaccess.h>
 
-#include <asm/uaccess.h>
+#ifdef DEBUG
+# define USE_DEBUG 1
+#else
+# define USE_DEBUG 0
+#endif
 
 enum {
         VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */
@@ -87,20 +94,24 @@ static Node *check_file(struct linux_binprm *bprm)
         char *p = strrchr(bprm->interp, '.');
         struct list_head *l;
 
+        /* Walk all the registered handlers. */
         list_for_each(l, &entries) {
                 Node *e = list_entry(l, Node, list);
                 char *s;
                 int j;
 
+                /* Make sure this one is currently enabled. */
                 if (!test_bit(Enabled, &e->flags))
                         continue;
 
+                /* Do matching based on extension if applicable. */
                 if (!test_bit(Magic, &e->flags)) {
                         if (p && !strcmp(e->magic, p + 1))
                                 return e;
                         continue;
                 }
 
+                /* Do matching based on magic & mask. */
                 s = bprm->buf + e->offset;
                 if (e->mask) {
                         for (j = 0; j < e->size; j++)
@@ -259,14 +270,17 @@ static char * check_special_flags (char * sfs, Node * e)
         while (cont) {
                 switch (*p) {
                         case 'P':
+                                pr_debug("register: flag: P (preserve argv0)\n");
                                 p++;
                                 e->flags |= MISC_FMT_PRESERVE_ARGV0;
                                 break;
                         case 'O':
+                                pr_debug("register: flag: O (open binary)\n");
                                 p++;
                                 e->flags |= MISC_FMT_OPEN_BINARY;
                                 break;
                         case 'C':
+                                pr_debug("register: flag: C (preserve creds)\n");
                                 p++;
                                 /* this flags also implies the
                                    open-binary flag */
@@ -292,6 +306,8 @@ static Node *create_entry(const char __user *buffer, size_t count)
         char *buf, *p;
         char del;
 
+        pr_debug("register: received %zu bytes\n", count);
+
         /* some sanity checks */
         err = -EINVAL;
         if ((count < 11) || (count > MAX_REGISTER_LENGTH))
@@ -311,8 +327,12 @@ static Node *create_entry(const char __user *buffer, size_t count)
 
         del = *p++;     /* delimeter */
 
+        pr_debug("register: delim: %#x {%c}\n", del, del);
+
+        /* Pad the buffer with the delim to simplify parsing below. */
         memset(buf+count, del, 8);
 
+        /* Parse the 'name' field. */
         e->name = p;
         p = strchr(p, del);
         if (!p)
@@ -323,46 +343,113 @@ static Node *create_entry(const char __user *buffer, size_t count)
             !strcmp(e->name, "..") ||
             strchr(e->name, '/'))
                 goto Einval;
+
+        pr_debug("register: name: {%s}\n", e->name);
+
+        /* Parse the 'type' field. */
         switch (*p++) {
-                case 'E': e->flags = 1<<Enabled; break;
-                case 'M': e->flags = (1<<Enabled) | (1<<Magic); break;
-                default: goto Einval;
+        case 'E':
+                pr_debug("register: type: E (extension)\n");
+                e->flags = 1 << Enabled;
+                break;
+        case 'M':
+                pr_debug("register: type: M (magic)\n");
+                e->flags = (1 << Enabled) | (1 << Magic);
+                break;
+        default:
+                goto Einval;
         }
         if (*p++ != del)
                 goto Einval;
+
         if (test_bit(Magic, &e->flags)) {
-                char *s = strchr(p, del);
+                /* Handle the 'M' (magic) format. */
+                char *s;
+
+                /* Parse the 'offset' field. */
+                s = strchr(p, del);
                 if (!s)
                         goto Einval;
                 *s++ = '\0';
                 e->offset = simple_strtoul(p, &p, 10);
                 if (*p++)
                         goto Einval;
+                pr_debug("register: offset: %#x\n", e->offset);
+
+                /* Parse the 'magic' field. */
                 e->magic = p;
                 p = scanarg(p, del);
                 if (!p)
                         goto Einval;
                 p[-1] = '\0';
-                if (!e->magic[0])
+                if (p == e->magic)
                         goto Einval;
+                if (USE_DEBUG)
+                        print_hex_dump_bytes(
+                                KBUILD_MODNAME ": register: magic[raw]: ",
+                                DUMP_PREFIX_NONE, e->magic, p - e->magic);
+
+                /* Parse the 'mask' field. */
                 e->mask = p;
                 p = scanarg(p, del);
                 if (!p)
                         goto Einval;
                 p[-1] = '\0';