On Tue, Jul 23, 2024 at 12:04:41PM +0200, Thorsten Leemhuis wrote:
On 23.07.24 06:11, Theodore Ts'o wrote:
On Mon, Jul 22, 2024 at 12:06:59AM -0700, Kees Cook wrote:
Is strscpy_pad appropriate if the @src parameter itself is a fixed length char[16] which isn't null terminated when the label itself is 16 chars long?
Nope; it needed memtostr_pad(). I sent the fix back at the end of May, but it only just recently landed: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
Yeah, sorry, I was on vacation for 3.5 weeks starting just before Memorial day, and it took me a while to get caught up. Unfortunately, I missed the bug in the strncpy extirpation patch, and it was't something that our regression tests caught. (Sometimes, the old/deprecated ways are just more reliable; all of ext4's strncpy() calls were working and had been correct for decades. :-P )
Anyway, Kees's bugfix is in Linus's tree, and it should be shortly be making its way to -stable.
Adding Greg and the stable list to the list of recipients: given that we already have two reports about trouble due to this[1] he might want to fast-track the fix (be27cd64461c45 ("ext4: use memtostr_pad() for s_volume_name")) to 6.10.y, as it's not queued yet -- at least afaics from looking at https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree...
Now queued up. And as it was not explicitly marked for stable inclusion, thank you for asking for it to be added.
I'll go push out a 6.10.1-rc1 in a short bit with this important fix.
thanks,
greg k-h