On Mon, Dec 16, 2019 at 05:45:29PM +0100, Arnd Bergmann wrote:
On Fri, Dec 13, 2019 at 10:05 PM Darrick J. Wong darrick.wong@oracle.com wrote:
On Fri, Dec 13, 2019 at 09:53:48PM +0100, Arnd Bergmann wrote:
When building a kernel that disables support for 32-bit time_t system calls, it also makes sense to disable the old xfs_bstat ioctls completely, as they truncate the timestamps to 32-bit values.
Note that current xfs doesn't support > 32-bit timestamps at all, so for now the old bulkstat/swapext ioctls will never overflow.
Right, this patch originally came after my version of the 40-bit timestamps that I dropped from the series now.
I've added "... once the extended times are supported." above now.
Granted, I melded everyone's suggestions into a more fully formed 'bigtime' feature patchset that I'll dump out soon as part of my usual end of year carpetbombing of the mailing list, so we likely still need most of this patch anyway...
What is the timeline for that work now? I'm mainly interested in getting the removal of 'time_t/timeval/timespec' and 'get_seconds()' from the kernel done for v5.6, but it would be good to also have this patch and the extended timestamps in the same version just so we can claim that "all known y2038 issues" are addressed in that release (I'm sure we will run into bugs we don't know yet).
Personally, I think you should push this whenever it's ready. Are you aiming to send all 24 patches as a treewide pull request directly to Linus, or would you rather the 2-3 xfs patches go through the xfs tree?
The y2038 format changes are going to take a while to push through review. If somehow it all gets through review for 5.6 I can always apply both and fix the merge damage, but more likely y2038 timestamps is a <cough> 5.8 EXPERIMENTAL thing.
Or later, given that Dave and I both have years worth of unreviewed patch backlog. :(
@@ -617,6 +618,23 @@ xfs_fsinumbers_fmt( return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp)); }
+/* disallow y2038-unsafe ioctls with CONFIG_COMPAT_32BIT_TIME=n */ +static bool xfs_have_compat_bstat_time32(unsigned int cmd)
The v5 bulkstat ioctls follow an entirely separate path through xfs_ioctl.c, so I think you don't need the @cmd parameter.
The check is there to not forbid XFS_IOC_FSINUMBERS at the moment, since that is not affected.
Aha.
@@ -1815,6 +1836,11 @@ xfs_ioc_swapext( struct fd f, tmp; int error = 0;
if (xfs_have_compat_bstat_time32(XFS_IOC_SWAPEXT)) {if (!xfs_have...()) ?
Right, fixed now.
<nod>
--D
Arnd