linux-hardening - [PATCH] bcachefs: Replace strlcpy() with strscpy()

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Date: Wed, 10 Jan 2024 15:54:41 -0800
From: Kees Cook <keescook@...omium.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Kees Cook <keescook@...omium.org>,
	Brian Foster <bfoster@...hat.com>,
	linux-bcachefs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] bcachefs: Replace strlcpy() with strscpy()

strlcpy() reads the entire source buffer first. This read may exceed
the destination size limit. This is both inefficient and can lead
to linear read overflows if a source string is not NUL-terminated[1].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().

Nothing checks the return value here, so a direct replacement with
strspy() is possible.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
Link: https://github.com/KSPP/linux/issues/89 [2]
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Brian Foster <bfoster@...hat.com>
Cc: linux-bcachefs@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/bcachefs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
index 9dbc35940197..cefe52898e8e 100644
--- a/fs/bcachefs/super.c
+++ b/fs/bcachefs/super.c
@@ -1386,8 +1386,8 @@ static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
 	prt_bdevname(&name, ca->disk_sb.bdev);
 
 	if (c->sb.nr_devices == 1)
-		strlcpy(c->name, name.buf, sizeof(c->name));
-	strlcpy(ca->name, name.buf, sizeof(ca->name));
+		strscpy(c->name, name.buf, sizeof(c->name));
+	strscpy(ca->name, name.buf, sizeof(ca->name));
 
 	printbuf_exit(&name);
 
-- 
2.34.1