CVSS: -EPSS: %CPEs: 6EXPL: 0CVE-2024-53052 – io_uring/rw: fix missing NOWAIT check for O_DIRECT start write
https://notcve.org/view.php?id=CVE-2024-53052
In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: fix missing NOWAIT check for O_DIRECT start write When io_uring starts a write, it'll call kiocb_start_write() to bump the super block rwsem, preventing any freezes from happening while that write is in-flight. The freeze side will grab that rwsem for writing, excluding any new writers from happening and waiting for existing writes to finish. But io_uring unconditionally uses kiocb_start_write(), which will block if someone is currently attempting to freeze the mount point. This causes a deadlock where freeze is waiting for previous writes to complete, but the previous writes cannot complete, as the task that is supposed to complete them is blocked waiting on starting a new write. This results in the following stuck trace showing that dependency with the write blocked starting a new write: task:fio state:D stack:0 pid:886 tgid:886 ppid:876 Call trace: __switch_to+0x1d8/0x348 __schedule+0x8e8/0x2248 schedule+0x110/0x3f0 percpu_rwsem_wait+0x1e8/0x3f8 __percpu_down_read+0xe8/0x500 io_write+0xbb8/0xff8 io_issue_sqe+0x10c/0x1020 io_submit_sqes+0x614/0x2110 __arm64_sys_io_uring_enter+0x524/0x1038 invoke_syscall+0x74/0x268 el0_svc_common.constprop.0+0x160/0x238 do_el0_svc+0x44/0x60 el0_svc+0x44/0xb0 el0t_64_sync_handler+0x118/0x128 el0t_64_sync+0x168/0x170 INFO: task fsfreeze:7364 blocked for more than 15 seconds. Not tainted 6.12.0-rc5-00063-g76aaf945701c #7963 with the attempting freezer stuck trying to grab the rwsem: task:fsfreeze state:D stack:0 pid:7364 tgid:7364 ppid:995 Call trace: __switch_to+0x1d8/0x348 __schedule+0x8e8/0x2248 schedule+0x110/0x3f0 percpu_down_write+0x2b0/0x680 freeze_super+0x248/0x8a8 do_vfs_ioctl+0x149c/0x1b18 __arm64_sys_ioctl+0xd0/0x1a0 invoke_syscall+0x74/0x268 el0_svc_common.constprop.0+0x160/0x238 do_el0_svc+0x44/0x60 el0_svc+0x44/0xb0 el0t_64_sync_handler+0x118/0x128 el0t_64_sync+0x168/0x170 Fix this by having the io_uring side honor IOCB_NOWAIT, and only attempt a blocking grab of the super block rwsem if it isn't set. For normal issue where IOCB_NOWAIT would always be set, this returns -EAGAIN which will have io_uring core issue a blocking attempt of the write. That will in turn also get completions run, ensuring forward progress. Since freezing requires CAP_SYS_ADMIN in the first place, this isn't something that can be triggered by a regular user. • https://git.kernel.org/stable/c/485d9232112b17f389b29497ff41b97b3189546b https://git.kernel.org/stable/c/4e24041ba86d50aaa4c792ae2c88ed01b3d96243 https://git.kernel.org/stable/c/9e8debb8e51354b201db494689198078ec2c1e75 https://git.kernel.org/stable/c/003d2996964c03dfd34860500428f4cdf1f5879e https://git.kernel.org/stable/c/26b8c48f369b7591f5679e0b90612f4862a32929 https://git.kernel.org/stable/c/1d60d74e852647255bd8e76f5a22dc42531e4389 •
CVSS: -EPSS: %CPEs: 2EXPL: 0CVE-2024-53051 – drm/i915/hdcp: Add encoder check in intel_hdcp_get_capability
https://notcve.org/view.php?id=CVE-2024-53051
In the Linux kernel, the following vulnerability has been resolved: drm/i915/hdcp: Add encoder check in intel_hdcp_get_capability Sometimes during hotplug scenario or suspend/resume scenario encoder is not always initialized when intel_hdcp_get_capability add a check to avoid kernel null pointer dereference. • https://git.kernel.org/stable/c/4912e8fb3c37fb2dedf48d9c18bbbecd70e720f8 https://git.kernel.org/stable/c/31b42af516afa1e184d1a9f9dd4096c54044269a •
CVSS: -EPSS: %CPEs: 2EXPL: 0CVE-2024-53050 – drm/i915/hdcp: Add encoder check in hdcp2_get_capability
https://notcve.org/view.php?id=CVE-2024-53050
In the Linux kernel, the following vulnerability has been resolved: drm/i915/hdcp: Add encoder check in hdcp2_get_capability Add encoder check in intel_hdcp2_get_capability to avoid null pointer error. • https://git.kernel.org/stable/c/5b89dcf23575eb5bb95ce8d672cbc2232c2eb096 https://git.kernel.org/stable/c/d34f4f058edf1235c103ca9c921dc54820d14d40 •
CVSS: -EPSS: %CPEs: 6EXPL: 0CVE-2024-53042 – ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow()
https://notcve.org/view.php?id=CVE-2024-53042
In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow() There are code paths from which the function is called without holding the RCU read lock, resulting in a suspicious RCU usage warning [1]. Fix by using l3mdev_master_upper_ifindex_by_index() which will acquire the RCU read lock before calling l3mdev_master_upper_ifindex_by_index_rcu(). [1] WARNING: suspicious RCU usage 6.12.0-rc3-custom-gac8f72681cf2 #141 Not tainted ----------------------------- net/core/dev.c:876 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by ip/361: #0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60 stack backtrace: CPU: 3 UID: 0 PID: 361 Comm: ip Not tainted 6.12.0-rc3-custom-gac8f72681cf2 #141 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Call Trace: <TASK> dump_stack_lvl+0xba/0x110 lockdep_rcu_suspicious.cold+0x4f/0xd6 dev_get_by_index_rcu+0x1d3/0x210 l3mdev_master_upper_ifindex_by_index_rcu+0x2b/0xf0 ip_tunnel_bind_dev+0x72f/0xa00 ip_tunnel_newlink+0x368/0x7a0 ipgre_newlink+0x14c/0x170 __rtnl_newlink+0x1173/0x19c0 rtnl_newlink+0x6c/0xa0 rtnetlink_rcv_msg+0x3cc/0xf60 netlink_rcv_skb+0x171/0x450 netlink_unicast+0x539/0x7f0 netlink_sendmsg+0x8c1/0xd80 ____sys_sendmsg+0x8f9/0xc20 ___sys_sendmsg+0x197/0x1e0 __sys_sendmsg+0x122/0x1f0 do_syscall_64+0xbb/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f • https://git.kernel.org/stable/c/ab6c9463b137163ba53fc050bf2c72bed2c997b8 https://git.kernel.org/stable/c/760852df570747e500a9632d34cbbf4faef30855 https://git.kernel.org/stable/c/db53cd3d88dc328dea2e968c9c8d3b4294a8a674 https://git.kernel.org/stable/c/e2742758c9c85c84e077ede5f916479f724e11c2 https://git.kernel.org/stable/c/5edcb3fdb12c3d46a6e79eeeec27d925b80fc168 https://git.kernel.org/stable/c/72c0f482e39c87317ebf67661e28c8d86c93e870 https://git.kernel.org/stable/c/699b48fc31727792edf2cab3829586ae6ba649e2 https://git.kernel.org/stable/c/6dfaa458fe923211c766238a224e0a3c0 •
CVSS: -EPSS: %CPEs: 3EXPL: 0CVE-2024-50304 – ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_find()
https://notcve.org/view.php?id=CVE-2024-50304
In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_find() The per-netns IP tunnel hash table is protected by the RTNL mutex and ip_tunnel_find() is only called from the control path where the mutex is taken. Add a lockdep expression to hlist_for_each_entry_rcu() in ip_tunnel_find() in order to validate that the mutex is held and to silence the suspicious RCU usage warning [1]. [1] WARNING: suspicious RCU usage 6.12.0-rc3-custom-gd95d9a31aceb #139 Not tainted ----------------------------- net/ipv4/ip_tunnel.c:221 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by ip/362: #0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60 stack backtrace: CPU: 12 UID: 0 PID: 362 Comm: ip Not tainted 6.12.0-rc3-custom-gd95d9a31aceb #139 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Call Trace: <TASK> dump_stack_lvl+0xba/0x110 lockdep_rcu_suspicious.cold+0x4f/0xd6 ip_tunnel_find+0x435/0x4d0 ip_tunnel_newlink+0x517/0x7a0 ipgre_newlink+0x14c/0x170 __rtnl_newlink+0x1173/0x19c0 rtnl_newlink+0x6c/0xa0 rtnetlink_rcv_msg+0x3cc/0xf60 netlink_rcv_skb+0x171/0x450 netlink_unicast+0x539/0x7f0 netlink_sendmsg+0x8c1/0xd80 ____sys_sendmsg+0x8f9/0xc20 ___sys_sendmsg+0x197/0x1e0 __sys_sendmsg+0x122/0x1f0 do_syscall_64+0xbb/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f • https://git.kernel.org/stable/c/c54419321455631079c7d6e60bc732dd0c5914c5 https://git.kernel.org/stable/c/27c1c98bd3b44b7c5f5c0ecfe1a1ec1240b73829 https://git.kernel.org/stable/c/f20fe2cfe06ca1b008b09da4f2b4e0c5547ccef6 https://git.kernel.org/stable/c/90e0569dd3d32f4f4d2ca691d3fa5a8a14a13c12 •