[PATCH] vfs: sanity check the length passed to inode_set_cached_link()

[Mateusz Guzik <mjguzik@gmail.com>]

This costs a strlen() call when instatianating a symlink.

Preferably it would be hidden behind VFS_WARN_ON (or compatible), but
there is no such facility at the moment. With the facility in place the
call can be patched out in production kernels.

In the meantime, since the cost is being paid unconditionally, use the
result to a fixup the bad caller.

This is not expected to persist in the long run (tm).

Sample splat:
bad length passed for symlink [/tmp/syz-imagegen43743633/file0/file0] (got 131109, expected 37)
[rest of WARN blurp goes here]

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---

This has a side effect of working around the panic reported in:
https://lore.kernel.org/all/67a1e1f4.050a0220.163cdc.0063.GAE@google.com/

I'm confident this merely exposed a bug in ext4, see:
https://lore.kernel.org/all/CAGudoHEv+Diti3r0x9VmF5ixgRVKk4trYnX_skVJNkQoTMaDHg@mail.gmail.com/#t

Nonethelss, should help catch future problems.

 include/linux/fs.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index be3ad155ec9f..1437a3323731 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -791,6 +791,19 @@ struct inode {
 
 static inline void inode_set_cached_link(struct inode *inode, char *link, int linklen)
 {
+	int testlen;
+
+	/*
+	 * TODO: patch it into a debug-only check if relevant macros show up.
+	 * In the meantime, since we are suffering strlen even on production kernels
+	 * to find the right length, do a fixup if the wrong value got passed.
+	 */
+	testlen = strlen(link);
+	if (testlen != linklen) {
+		WARN_ONCE(1, "bad length passed for symlink [%s] (got %d, expected %d)",
+			  link, linklen, testlen);
+		linklen = testlen;
+	}
 	inode->i_link = link;
 	inode->i_linklen = linklen;
 	inode->i_opflags |= IOP_CACHED_LINK;
-- 
2.43.0