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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-28 20:39:26 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-28 20:39:26 -0700 |
commit | c54b245d011855ea91c5beff07f1db74143ce614 (patch) | |
tree | 7982f28c76f578997f342c7255e222dabeffde63 /kernel/user_namespace.c | |
parent | e17c120f48f7d86ed9fd6e44e9436d32997fd9ec (diff) | |
parent | 5e6b8a50a7cec5686ee2c4bda1d49899c79a7eae (diff) | |
download | linux-c54b245d011855ea91c5beff07f1db74143ce614.tar.bz2 |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull user namespace rlimit handling update from Eric Biederman:
"This is the work mainly by Alexey Gladkov to limit rlimits to the
rlimits of the user that created a user namespace, and to allow users
to have stricter limits on the resources created within a user
namespace."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
cred: add missing return error code when set_cred_ucounts() failed
ucounts: Silence warning in dec_rlimit_ucounts
ucounts: Set ucount_max to the largest positive value the type can hold
kselftests: Add test to check for rlimit changes in different user namespaces
Reimplement RLIMIT_MEMLOCK on top of ucounts
Reimplement RLIMIT_SIGPENDING on top of ucounts
Reimplement RLIMIT_MSGQUEUE on top of ucounts
Reimplement RLIMIT_NPROC on top of ucounts
Use atomic_t for ucounts reference counting
Add a reference to ucounts for each cred
Increase size of ucounts to atomic_long_t
Diffstat (limited to 'kernel/user_namespace.c')
-rw-r--r-- | kernel/user_namespace.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 8d62863721b0..ef82d401dde8 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -119,9 +119,13 @@ int create_user_ns(struct cred *new) ns->owner = owner; ns->group = group; INIT_WORK(&ns->work, free_user_ns); - for (i = 0; i < UCOUNT_COUNTS; i++) { + for (i = 0; i < MAX_PER_NAMESPACE_UCOUNTS; i++) { ns->ucount_max[i] = INT_MAX; } + set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_NPROC, rlimit(RLIMIT_NPROC)); + set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_MSGQUEUE, rlimit(RLIMIT_MSGQUEUE)); + set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_SIGPENDING, rlimit(RLIMIT_SIGPENDING)); + set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_MEMLOCK, rlimit(RLIMIT_MEMLOCK)); ns->ucounts = ucounts; /* Inherit USERNS_SETGROUPS_ALLOWED from our parent */ @@ -1340,6 +1344,9 @@ static int userns_install(struct nsset *nsset, struct ns_common *ns) put_user_ns(cred->user_ns); set_cred_user_ns(cred, get_user_ns(user_ns)); + if (set_cred_ucounts(cred) < 0) + return -EINVAL; + return 0; } |