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inotify: Convert to using per-namespace limits

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This patchset converts inotify to using the newly introduced
per-userns sysctl infrastructure.

Currently the inotify instances/watches are being accounted in the
user_struct structure. This means that in setups where multiple
users in unprivileged containers map to the same underlying
real user (i.e. pointing to the same user_struct) the inotify limits
are going to be shared as well, allowing one user(or application) to exhaust
all others limits.

Fix this by switching the inotify sysctls to using the
per-namespace/per-user limits. This will allow the server admin to
set sensible global limits, which can further be tuned inside every
individual user namespace. Additionally, in order to preserve the
sysctl ABI make the existing inotify instances/watches sysctls
modify the values of the initial user namespace.

Signed-off-by: Nikolay Borisov <n.borisov.lkml@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Nikolay Borisov 2016-12-14 15:56:33 +02:00 • committed by Eric W. Biederman
parent 880a38547f
commit 1cce1eea0a
7 changed files with 47 additions and 27 deletions
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3
include/linux/fsnotify_backend.h
View file

@ -16,6 +16,7 @@
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/atomic.h>
#include <linux/user_namespace.h>
/*
* IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
@ -170,7 +171,7 @@ struct fsnotify_group {
struct inotify_group_private_data {
spinlock_t idr_lock;
struct idr idr;
struct user_struct *user;
struct ucounts *ucounts;
} inotify_data;
#endif
#ifdef CONFIG_FANOTIFY