From 39100faae832e856b54d57cfd2cb967bc1b5294f Mon Sep 17 00:00:00 2001 From: Ma Wupeng Date: Tue, 11 Mar 2025 08:51:19 +0900 Subject: [PATCH] ipc: fix memleak if msg_init_ns failed in create_ipc_ns BugLink: https://bugs.launchpad.net/bugs/2101915 commit bc8f5921cd69188627c08041276238de222ab466 upstream. Percpu memory allocation may failed during create_ipc_ns however this fail is not handled properly since ipc sysctls and mq sysctls is not released properly. Fix this by release these two resource when failure. Here is the kmemleak stack when percpu failed: unreferenced object 0xffff88819de2a600 (size 512): comm "shmem_2nstest", pid 120711, jiffies 4300542254 hex dump (first 32 bytes): 60 aa 9d 84 ff ff ff ff fc 18 48 b2 84 88 ff ff `.........H..... 04 00 00 00 a4 01 00 00 20 e4 56 81 ff ff ff ff ........ .V..... backtrace (crc be7cba35): [] __kmalloc_node_track_caller_noprof+0x333/0x420 [] kmemdup_noprof+0x26/0x50 [] setup_mq_sysctls+0x57/0x1d0 [] copy_ipcs+0x29c/0x3b0 [] create_new_namespaces+0x1d0/0x920 [] copy_namespaces+0x2e9/0x3e0 [] copy_process+0x29f3/0x7ff0 [] kernel_clone+0xc0/0x650 [] __do_sys_clone+0xa1/0xe0 [] do_syscall_64+0xbf/0x1c0 [] entry_SYSCALL_64_after_hwframe+0x4b/0x53 Link: https://lkml.kernel.org/r/20241023093129.3074301-1-mawupeng1@huawei.com Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter") Signed-off-by: Ma Wupeng Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman CVE-2024-53175 Signed-off-by: Koichiro Den Signed-off-by: Stefan Bader --- ipc/namespace.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/ipc/namespace.c b/ipc/namespace.c index aa3c2fe5d9fb..f5f16f6302d3 100644 --- a/ipc/namespace.c +++ b/ipc/namespace.c @@ -83,13 +83,15 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns, err = msg_init_ns(ns); if (err) - goto fail_put; + goto fail_ipc; sem_init_ns(ns); shm_init_ns(ns); return ns; +fail_ipc: + retire_ipc_sysctls(ns); fail_mq: retire_mq_sysctls(ns);