From 7391928025f28cd4cab43e59d2b4e36509b9337e Mon Sep 17 00:00:00 2001 From: Azeem Shaikh Date: Tue, 9 May 2023 01:41:36 +0000 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 Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20230509014136.2095900-1-azeemshaikh38@gmail.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 1b7e0f7..53b36aa 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 32749fc..eee9237 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; -- 2.7.4