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bcachefs: Replace 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[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);