From: legion@kernel.org
To: LKML <linux-kernel@vger.kernel.org>,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
Linux Containers <containers@lists.linux-foundation.org>,
linux-mm@kvack.org
Cc: Jens Axboe <axboe@kernel.dk>, Kees Cook <keescook@chromium.org>,
Jann Horn <jannh@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Alexey Gladkov <legion@kernel.org>,
Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH v11 1/9] Increase size of ucounts to atomic_long_t
Date: Thu, 22 Apr 2021 14:27:08 +0200 [thread overview]
Message-ID: <257aa5fb1a7d81cf0f4c34f39ada2320c4284771.1619094428.git.legion@kernel.org> (raw)
In-Reply-To: <cover.1619094428.git.legion@kernel.org>
From: Alexey Gladkov <legion@kernel.org>
RLIMIT_MSGQUEUE and RLIMIT_MEMLOCK use unsigned long to store their
counters. As a preparation for moving rlimits based on ucounts, we need
to increase the size of the variable to long.
Signed-off-by: Alexey Gladkov <legion@kernel.org>
---
include/linux/user_namespace.h | 4 ++--
kernel/ucount.c | 16 ++++++++--------
2 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 64cf8ebdc4ec..0bb833fd41f4 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -85,7 +85,7 @@ struct user_namespace {
struct ctl_table_header *sysctls;
#endif
struct ucounts *ucounts;
- int ucount_max[UCOUNT_COUNTS];
+ long ucount_max[UCOUNT_COUNTS];
} __randomize_layout;
struct ucounts {
@@ -93,7 +93,7 @@ struct ucounts {
struct user_namespace *ns;
kuid_t uid;
int count;
- atomic_t ucount[UCOUNT_COUNTS];
+ atomic_long_t ucount[UCOUNT_COUNTS];
};
extern struct user_namespace init_user_ns;
diff --git a/kernel/ucount.c b/kernel/ucount.c
index 11b1596e2542..04c561751af1 100644
--- a/kernel/ucount.c
+++ b/kernel/ucount.c
@@ -175,14 +175,14 @@ static void put_ucounts(struct ucounts *ucounts)
kfree(ucounts);
}
-static inline bool atomic_inc_below(atomic_t *v, int u)
+static inline bool atomic_long_inc_below(atomic_long_t *v, int u)
{
- int c, old;
- c = atomic_read(v);
+ long c, old;
+ c = atomic_long_read(v);
for (;;) {
if (unlikely(c >= u))
return false;
- old = atomic_cmpxchg(v, c, c+1);
+ old = atomic_long_cmpxchg(v, c, c+1);
if (likely(old == c))
return true;
c = old;
@@ -196,17 +196,17 @@ struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid,
struct user_namespace *tns;
ucounts = get_ucounts(ns, uid);
for (iter = ucounts; iter; iter = tns->ucounts) {
- int max;
+ long max;
tns = iter->ns;
max = READ_ONCE(tns->ucount_max[type]);
- if (!atomic_inc_below(&iter->ucount[type], max))
+ if (!atomic_long_inc_below(&iter->ucount[type], max))
goto fail;
}
return ucounts;
fail:
bad = iter;
for (iter = ucounts; iter != bad; iter = iter->ns->ucounts)
- atomic_dec(&iter->ucount[type]);
+ atomic_long_dec(&iter->ucount[type]);
put_ucounts(ucounts);
return NULL;
@@ -216,7 +216,7 @@ void dec_ucount(struct ucounts *ucounts, enum ucount_type type)
{
struct ucounts *iter;
for (iter = ucounts; iter; iter = iter->ns->ucounts) {
- int dec = atomic_dec_if_positive(&iter->ucount[type]);
+ long dec = atomic_long_dec_if_positive(&iter->ucount[type]);
WARN_ON_ONCE(dec < 0);
}
put_ucounts(ucounts);
--
2.29.3
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next prev parent reply other threads:[~2021-04-22 12:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 12:27 [PATCH v11 0/9] Count rlimits in each user namespace legion
2021-04-22 12:27 ` legion [this message]
2021-04-22 12:27 ` [PATCH v11 2/9] Add a reference to ucounts for each cred legion
2021-04-22 12:27 ` [PATCH v11 3/9] Use atomic_t for ucounts reference counting legion
2021-04-22 12:27 ` [PATCH v11 4/9] Reimplement RLIMIT_NPROC on top of ucounts legion
2021-04-29 14:04 ` Dan Carpenter
2021-04-30 18:09 ` [PATCH] ucounts: Silence warning in dec_rlimit_ucounts Eric W. Biederman
2021-04-22 12:27 ` [PATCH v11 5/9] Reimplement RLIMIT_MSGQUEUE on top of ucounts legion
2021-04-22 12:27 ` [PATCH v11 6/9] Reimplement RLIMIT_SIGPENDING " legion
2021-04-22 12:27 ` [PATCH v11 7/9] Reimplement RLIMIT_MEMLOCK " legion
2021-04-22 12:27 ` [PATCH v11 8/9] kselftests: Add test to check for rlimit changes in different user namespaces legion
2021-04-22 12:27 ` [PATCH v11 9/9] ucounts: Set ucount_max to the largest positive value the type can hold legion
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