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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@linux.dev>
Cc: Brian Foster <bfoster@redhat.com>
Cc:  <linux-bcachefs@vger.kernel.org>
Link: https://lore.kernel.org/r/20240110235438.work.385-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2024-01-10 15:54:41 -08:00
parent b0d326da46
commit e28b035958
1 changed files with 2 additions and 2 deletions
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4
fs/bcachefs/super.c
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@ -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);