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befs: Replace all non-returning strlcpy with strscpy

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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
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@ -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;