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Message-ID: <CA+G9fYv+Azmu+_YUv6+C6RRM990k0FhUc0hgSJKssubmsWfvhA@mail.gmail.com>
Date: Fri, 6 Aug 2021 16:06:51 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>,
Nathan Chancellor <nathan@...nel.org>,
Alexey Gladkov <legion@...nel.org>,
open list <linux-kernel@...r.kernel.org>,
LTP List <ltp@...ts.linux.it>, linux-fsdevel@...r.kernel.org,
Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v3] ucounts: add missing data type changes
On Fri, 6 Aug 2021 at 00:56, Nathan Chancellor <nathan@...nel.org> wrote:
>
> On 8/5/2021 9:48 AM, Eric W. Biederman wrote:
> > Nathan Chancellor <nathan@...nel.org> writes:
> >
> >> Hi Eric,
> >>
> >> On 8/4/2021 12:47 PM, Eric W. Biederman wrote:
> >>> Nathan Chancellor <nathan@...nel.org> writes:
> >>>
> >>>> On Fri, Jul 30, 2021 at 08:28:54AM +0200, Sven Schnelle wrote:
> >>>>> commit f9c82a4ea89c3 ("Increase size of ucounts to atomic_long_t")
> >>>>> changed the data type of ucounts/ucounts_max to long, but missed to
> >>>>> adjust a few other places. This is noticeable on big endian platforms
> >>>>> from user space because the /proc/sys/user/max_*_names files all
> >>>>> contain 0.
> >>>>>
> >>>>> Fixes: f9c82a4ea89c ("Increase size of ucounts to atomic_long_t")
> >>>>> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> >>>>
> >>>> This patch in -next as commit e43fc41d1f7f ("ucounts: add missing data type
> >>>> changes") causes Windows Subsystem for Linux to fail to start:
On Linux next-20210802..next-20210805 we have been noticing
that LTP syscalls inotify06 test case getting failed all architectures.
BAD:
Linux next-20210802
inotify06.c:57: TBROK: Failed to close FILE
'/proc/sys/fs/inotify/max_user_instances': EINVAL (22)
inotify06.c:107: TWARN: Failed to close FILE
'/proc/sys/fs/inotify/max_user_instances': EINVAL (22)
GOOD:
Linux next-20210730
inotify06.c:92: TPASS: kernel survived inotify beating
Investigation:
Following changes found between good and bad Linux next tags under fs/notify
git log --oneline --stat next-20210730..next-20210802 fs/notify
e43fc41d1f7f ucounts: add missing data type changes
fs/notify/fanotify/fanotify_user.c | 10 ++++++----
fs/notify/inotify/inotify_user.c | 10 ++++++----
2 files changed, 12 insertions(+), 8 deletions(-)
Conclusion:
We have confirmed this patch caused the LTP syscalls inotify06 test failure.
After applying your proposed fix patch [1] the reported test getting pass.
However, I have to run full test plan to confirm this do not cause regressions.
Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
[1] https://lore.kernel.org/lkml/87v94jalck.fsf@disp2133/
> > diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> > index 6576657a1a25..28b67cb9458d 100644
> > --- a/fs/notify/fanotify/fanotify_user.c
> > +++ b/fs/notify/fanotify/fanotify_user.c
> > @@ -54,6 +54,9 @@ static int fanotify_max_queued_events __read_mostly;
> >
> > #include <linux/sysctl.h>
> >
> > +static long ft_zero = 0;
> > +static long ft_int_max = INT_MAX;
> > +
> > struct ctl_table fanotify_table[] = {
> > {
> > .procname = "max_user_groups",
> > @@ -61,8 +64,8 @@ struct ctl_table fanotify_table[] = {
> > .maxlen = sizeof(long),
> > .mode = 0644,
> > .proc_handler = proc_doulongvec_minmax,
> > - .extra1 = SYSCTL_ZERO,
> > - .extra2 = SYSCTL_INT_MAX,
> > + .extra1 = &ft_zero,
> > + .extra2 = &ft_int_max,
> > },
> > {
> > .procname = "max_user_marks",
> > @@ -70,8 +73,8 @@ struct ctl_table fanotify_table[] = {
> > .maxlen = sizeof(long),
> > .mode = 0644,
> > .proc_handler = proc_doulongvec_minmax,
> > - .extra1 = SYSCTL_ZERO,
> > - .extra2 = SYSCTL_INT_MAX,
> > + .extra1 = &ft_zero,
> > + .extra2 = &ft_int_max,
> > },
> > {
> > .procname = "max_queued_events",
> > diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
> > index 55fe7cdea2fb..62051247f6d2 100644
> > --- a/fs/notify/inotify/inotify_user.c
> > +++ b/fs/notify/inotify/inotify_user.c
> > @@ -55,6 +55,9 @@ struct kmem_cache *inotify_inode_mark_cachep __read_mostly;
> >
> > #include <linux/sysctl.h>
> >
> > +static long it_zero = 0;
> > +static long it_int_max = INT_MAX;
> > +
> > struct ctl_table inotify_table[] = {
> > {
> > .procname = "max_user_instances",
> > @@ -62,8 +65,8 @@ struct ctl_table inotify_table[] = {
> > .maxlen = sizeof(long),
> > .mode = 0644,
> > .proc_handler = proc_doulongvec_minmax,
> > - .extra1 = SYSCTL_ZERO,
> > - .extra2 = SYSCTL_INT_MAX,
> > + .extra1 = &it_zero,
> > + .extra2 = &it_int_max,
> > },
> > {
> > .procname = "max_user_watches",
> > @@ -71,8 +74,8 @@ struct ctl_table inotify_table[] = {
> > .maxlen = sizeof(long),
> > .mode = 0644,
> > .proc_handler = proc_doulongvec_minmax,
> > - .extra1 = SYSCTL_ZERO,
> > - .extra2 = SYSCTL_INT_MAX,
> > + .extra1 = &it_zero,
> > + .extra2 = &it_int_max,
> > },
> > {
> > .procname = "max_queued_events",
> > diff --git a/kernel/ucount.c b/kernel/ucount.c
> > index 260ae7da815f..bb51849e6375 100644
> > --- a/kernel/ucount.c
> > +++ b/kernel/ucount.c
> > @@ -58,14 +58,17 @@ static struct ctl_table_root set_root = {
> > .permissions = set_permissions,
> > };
> >
> > +static long ue_zero = 0;
> > +static long ue_int_max = INT_MAX;
> > +
> > #define UCOUNT_ENTRY(name) \
> > { \
> > .procname = name, \
> > .maxlen = sizeof(long), \
> > .mode = 0644, \
> > .proc_handler = proc_doulongvec_minmax, \
> > - .extra1 = SYSCTL_ZERO, \
> > - .extra2 = SYSCTL_INT_MAX, \
> > + .extra1 = &ue_zero, \
> > + .extra2 = &ue_int_max, \
> > }
> > static struct ctl_table user_table[] = {
> > UCOUNT_ENTRY("max_user_namespaces"),
--
Linaro LKFT
https://lkft.linaro.org
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