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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@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230509014136.2095900-1-azeemshaikh38@gmail.com
This commit is contained in:
Azeem Shaikh 2023-05-09 01:41:36 +00:00 committed by Kees Cook
parent 2f088dfc18
commit 7391928025
2 changed files with 2 additions and 2 deletions
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2
fs/befs/btree.c
View File

@ -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;

2
fs/befs/linuxvfs.c
View File

@ -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;