From: Arnd Bergmann <arnd@arndb.de>
To: y2038@lists.linaro.org, linux-kernel@vger.kernel.org,
"Darrick J. Wong" <darrick.wong@oracle.com>,
linux-xfs@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>, Brian Foster <bfoster@redhat.com>,
Dave Chinner <dchinner@redhat.com>,
Allison Collins <allison.henderson@oracle.com>,
Jan Kara <jack@suse.cz>, Eric Sandeen <sandeen@sandeen.net>
Subject: [PATCH v2 20/24] xfs: disallow broken ioctls without compat-32-bit-time
Date: Fri, 13 Dec 2019 21:53:48 +0100 [thread overview]
Message-ID: <20191213205417.3871055-11-arnd@arndb.de> (raw)
In-Reply-To: <20191213204936.3643476-1-arnd@arndb.de>
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.
Any application using these needs to be updated to use the v5
interfaces.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
fs/xfs/xfs_ioctl.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 7b35d62ede9f..a4a4eed8879c 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -36,6 +36,7 @@
#include "xfs_reflink.h"
#include "xfs_ioctl.h"
+#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -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)
+{
+ if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
+ return true;
+
+ if (IS_ENABLED(CONFIG_64BIT) && !in_compat_syscall())
+ return true;
+
+ if (cmd == XFS_IOC_FSBULKSTAT_SINGLE ||
+ cmd == XFS_IOC_FSBULKSTAT ||
+ cmd == XFS_IOC_SWAPEXT)
+ return false;
+
+ return true;
+}
+
STATIC int
xfs_ioc_fsbulkstat(
xfs_mount_t *mp,
@@ -637,6 +655,9 @@ xfs_ioc_fsbulkstat(
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
+ if (!xfs_have_compat_bstat_time32(cmd))
+ return -EINVAL;
+
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
@@ -1815,6 +1836,11 @@ xfs_ioc_swapext(
struct fd f, tmp;
int error = 0;
+ if (xfs_have_compat_bstat_time32(XFS_IOC_SWAPEXT)) {
+ error = -EINVAL;
+ goto out;
+ }
+
/* Pull information for the target fd */
f = fdget((int)sxp->sx_fdtarget);
if (!f.file) {
--
2.20.0
next prev parent reply other threads:[~2019-12-13 20:57 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 20:49 [PATCH v2 00/24] drivers, fs: y2038 updates Arnd Bergmann
2019-12-13 20:49 ` [PATCH v2 01/24] Input: input_event: fix struct padding on sparc64 Arnd Bergmann
2019-12-13 22:08 ` Dmitry Torokhov
2019-12-13 20:49 ` [PATCH v2 02/24] fat: use prandom_u32() for i_generation Arnd Bergmann
2019-12-13 20:49 ` [PATCH v2 03/24] dlm: use SO_SNDTIMEO_NEW instead of SO_SNDTIMEO_OLD Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 04/24] xtensa: ISS: avoid struct timeval Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 05/24] um: ubd: use 64-bit time_t where possible Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 06/24] acct: stop using get_seconds() Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 07/24] tsacct: add 64-bit btime field Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 08/24] packet: clarify timestamp overflow Arnd Bergmann
2019-12-13 20:52 ` [PATCH v2 09/24] quota: avoid time_t in v1_disk_dqblk definition Arnd Bergmann
2019-12-16 13:14 ` Jan Kara
2019-12-13 20:53 ` [PATCH v2 10/24] hostfs: pass 64-bit timestamps to/from user space Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 11/24] hfs/hfsplus: use 64-bit inode timestamps Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 12/24] drm/msm: avoid using 'timespec' Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 13/24] drm/etnaviv: reject timeouts with tv_nsec >= NSEC_PER_SEC Arnd Bergmann
2020-01-08 1:16 ` [Y2038] " Ben Hutchings
2020-01-17 15:47 ` Guido Günther
2020-01-20 17:47 ` Lucas Stach
2020-01-20 18:47 ` Arnd Bergmann
2020-01-21 10:21 ` Lucas Stach
2020-01-21 11:46 ` Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 14/24] drm/etnaviv: avoid deprecated timespec Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 15/24] sunrpc: convert to time64_t for expiry Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 16/24] nfs: use time64_t internally Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 17/24] nfs: fix timstamp debug prints Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 18/24] nfs: fscache: use timespec64 in inode auxdata Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 19/24] xfs: rename compat_time_t to old_time32_t Arnd Bergmann
2019-12-13 21:18 ` Darrick J. Wong
2019-12-16 16:31 ` Arnd Bergmann
2019-12-13 20:53 ` Arnd Bergmann [this message]
2019-12-13 21:05 ` [PATCH v2 20/24] xfs: disallow broken ioctls without compat-32-bit-time Darrick J. Wong
2019-12-16 16:45 ` Arnd Bergmann
2019-12-16 16:52 ` Darrick J. Wong
2019-12-17 15:06 ` Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 21/24] xfs: quota: move to time64_t interfaces Arnd Bergmann
2019-12-13 21:17 ` Darrick J. Wong
2019-12-16 16:52 ` Arnd Bergmann
2019-12-17 15:02 ` Arnd Bergmann
2019-12-17 22:15 ` Darrick J. Wong
2019-12-18 16:44 ` Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 22/24] y2038: remove obsolete jiffies conversion functions Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 23/24] y2038: rename itimerval to __kernel_old_itimerval Arnd Bergmann
2019-12-13 20:53 ` [PATCH v2 24/24] y2038: sparc: remove use of struct timex Arnd Bergmann
2019-12-14 1:37 ` Julian Calaby
2019-12-14 14:44 ` [Y2038] " Arnd Bergmann
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