linux-kernel - [PATCH] befs: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230509014136.2095900-1-azeemshaikh38@gmail.com>
Date:   Tue,  9 May 2023 01:41:36 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     keescook@...gle.com, Luis de Bethencourt <luisbg@...nel.org>,
        Salah Triki <salah.triki@...il.com>
Cc:     Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] befs: Replace all non-returning 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.
In an effort to remove strlcpy() completely, replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 fs/befs/btree.c    |    2 +-
 fs/befs/linuxvfs.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/befs/btree.c b/fs/befs/btree.c
index 1b7e0f7128d6..53b36aa29978 100644
--- a/fs/befs/btree.c
+++ b/fs/befs/btree.c
@@ -500,7 +500,7 @@ befs_btree_read(struct super_block *sb, const befs_data_stream *ds,
 		goto error_alloc;
 	}
 
-	strlcpy(keybuf, keystart, keylen + 1);
+	strscpy(keybuf, keystart, keylen + 1);
 	*value = fs64_to_cpu(sb, valarray[cur_key]);
 	*keysize = keylen;
 
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 32749fcee090..eee9237386e2 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -374,7 +374,7 @@ static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
 	if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
 		inode->i_size = 0;
 		inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
-		strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
+		strscpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
 			BEFS_SYMLINK_LEN);
 	} else {
 		int num_blks;