CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-43837 – bpf: Fix null pointer dereference in resolve_prog_type() for BPF_PROG_TYPE_EXT
https://notcve.org/view.php?id=CVE-2024-43837
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix null pointer dereference in resolve_prog_type() for BPF_PROG_TYPE_EXT When loading a EXT program without specifying `attr->attach_prog_fd`, the `prog->aux->dst_prog` will be null. At this time, calling resolve_prog_type() anywhere will result in a null pointer dereference. Example stack trace: [ 8.107863] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 [ 8.108262] Mem abort info: [ 8.108384] ESR = 0x0000000096000004 [ 8.108547] EC = 0x25: DABT (current EL), IL = 32 bits [ 8.108722] SET = 0, FnV = 0 [ 8.108827] EA = 0, S1PTW = 0 [ 8.108939] FSC = 0x04: level 0 translation fault [ 8.109102] Data abort info: [ 8.109203] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 8.109399] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 8.109614] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 8.109836] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000101354000 [ 8.110011] [0000000000000004] pgd=0000000000000000, p4d=0000000000000000 [ 8.112624] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP [ 8.112783] Modules linked in: [ 8.113120] CPU: 0 PID: 99 Comm: may_access_dire Not tainted 6.10.0-rc3-next-20240613-dirty #1 [ 8.113230] Hardware name: linux,dummy-virt (DT) [ 8.113390] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 8.113429] pc : may_access_direct_pkt_data+0x24/0xa0 [ 8.113746] lr : add_subprog_and_kfunc+0x634/0x8e8 [ 8.113798] sp : ffff80008283b9f0 [ 8.113813] x29: ffff80008283b9f0 x28: ffff800082795048 x27: 0000000000000001 [ 8.113881] x26: ffff0000c0bb2600 x25: 0000000000000000 x24: 0000000000000000 [ 8.113897] x23: ffff0000c1134000 x22: 000000000001864f x21: ffff0000c1138000 [ 8.113912] x20: 0000000000000001 x19: ffff0000c12b8000 x18: ffffffffffffffff [ 8.113929] x17: 0000000000000000 x16: 0000000000000000 x15: 0720072007200720 [ 8.113944] x14: 0720072007200720 x13: 0720072007200720 x12: 0720072007200720 [ 8.113958] x11: 0720072007200720 x10: 0000000000f9fca4 x9 : ffff80008021f4e4 [ 8.113991] x8 : 0101010101010101 x7 : 746f72705f6d656d x6 : 000000001e0e0f5f [ 8.114006] x5 : 000000000001864f x4 : ffff0000c12b8000 x3 : 000000000000001c [ 8.114020] x2 : 0000000000000002 x1 : 0000000000000000 x0 : 0000000000000000 [ 8.114126] Call trace: [ 8.114159] may_access_direct_pkt_data+0x24/0xa0 [ 8.114202] bpf_check+0x3bc/0x28c0 [ 8.114214] bpf_prog_load+0x658/0xa58 [ 8.114227] __sys_bpf+0xc50/0x2250 [ 8.114240] __arm64_sys_bpf+0x28/0x40 [ 8.114254] invoke_syscall.constprop.0+0x54/0xf0 [ 8.114273] do_el0_svc+0x4c/0xd8 [ 8.114289] el0_svc+0x3c/0x140 [ 8.114305] el0t_64_sync_handler+0x134/0x150 [ 8.114331] el0t_64_sync+0x168/0x170 [ 8.114477] Code: 7100707f 54000081 f9401c00 f9403800 (b9400403) [ 8.118672] ---[ end trace 0000000000000000 ]--- One way to fix it is by forcing `attach_prog_fd` non-empty when bpf_prog_load(). But this will lead to `libbpf_probe_bpf_prog_type` API broken which use verifier log to probe prog type and will log nothing if we reject invalid EXT prog before bpf_check(). Another way is by adding null check in resolve_prog_type(). The issue was introduced by commit 4a9c7bbe2ed4 ("bpf: Resolve to prog->aux->dst_prog->type only for BPF_PROG_TYPE_EXT") which wanted to correct type resolution for BPF_PROG_TYPE_TRACING programs. Before that, the type resolution of BPF_PROG_TYPE_EXT prog actually follows the logic below: prog->aux->dst_prog ? prog->aux->dst_prog->type : prog->type; It implies that when EXT program is not yet attached to `dst_prog`, the prog type should be EXT itself. • https://git.kernel.org/stable/c/4a9c7bbe2ed4d2b240674b1fb606c41d3940c412 https://git.kernel.org/stable/c/fcac5feb06f31ee4c88bca9bf98d8bc3ca7d2615 https://git.kernel.org/stable/c/9d40fd516aeae6779e3c84c6b96700ca76285847 https://git.kernel.org/stable/c/b29a880bb145e1f1c1df5ab88ed26b1495ff9f09 https://git.kernel.org/stable/c/f7866c35873377313ff94398f17d425b28b71de1 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-43836 – net: ethtool: pse-pd: Fix possible null-deref
https://notcve.org/view.php?id=CVE-2024-43836
In the Linux kernel, the following vulnerability has been resolved: net: ethtool: pse-pd: Fix possible null-deref Fix a possible null dereference when a PSE supports both c33 and PoDL, but only one of the netlink attributes is specified. The c33 or PoDL PSE capabilities are already validated in the ethnl_set_pse_validate() call. • https://git.kernel.org/stable/c/4d18e3ddf427d93a2895a1c9d61477e1f1726cad https://git.kernel.org/stable/c/e187690b125a297499eadeec53c32c5ed6d7436a https://git.kernel.org/stable/c/4cddb0f15ea9c62f81b4889ea69a99368cc63a86 •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-43835 – virtio_net: Fix napi_skb_cache_put warning
https://notcve.org/view.php?id=CVE-2024-43835
In the Linux kernel, the following vulnerability has been resolved: virtio_net: Fix napi_skb_cache_put warning After the commit bdacf3e34945 ("net: Use nested-BH locking for napi_alloc_cache.") was merged, the following warning began to appear: WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0 __warn+0x12f/0x340 napi_skb_cache_put+0x82/0x4b0 napi_skb_cache_put+0x82/0x4b0 report_bug+0x165/0x370 handle_bug+0x3d/0x80 exc_invalid_op+0x1a/0x50 asm_exc_invalid_op+0x1a/0x20 __free_old_xmit+0x1c8/0x510 napi_skb_cache_put+0x82/0x4b0 __free_old_xmit+0x1c8/0x510 __free_old_xmit+0x1c8/0x510 __pfx___free_old_xmit+0x10/0x10 The issue arises because virtio is assuming it's running in NAPI context even when it's not, such as in the netpoll case. To resolve this, modify virtnet_poll_tx() to only set NAPI when budget is available. Same for virtnet_poll_cleantx(), which always assumed that it was in a NAPI context. • https://git.kernel.org/stable/c/df133f3f96257ee29696c0ed8bd198ec801dc810 https://git.kernel.org/stable/c/19ac6f29bf64304ef04630c8ab56ecd2059d7aa1 https://git.kernel.org/stable/c/d3af435e8ace119e58d8e21d3d2d6a4e7c4a4baa https://git.kernel.org/stable/c/842a97b5e44f0c8a9fc356fe976e0e13ddcf7783 https://git.kernel.org/stable/c/cc7340f18e45886121c131227985d64ef666012f https://git.kernel.org/stable/c/6b5325f2457521bbece29499970c0117a648c620 https://git.kernel.org/stable/c/f5e9a22d19bb98a7e86034db85eb295e94187caa https://git.kernel.org/stable/c/468a729b78895893d0e580ceea49bed8a •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-43834 – xdp: fix invalid wait context of page_pool_destroy()
https://notcve.org/view.php?id=CVE-2024-43834
In the Linux kernel, the following vulnerability has been resolved: xdp: fix invalid wait context of page_pool_destroy() If the driver uses a page pool, it creates a page pool with page_pool_create(). The reference count of page pool is 1 as default. A page pool will be destroyed only when a reference count reaches 0. page_pool_destroy() is used to destroy page pool, it decreases a reference count. When a page pool is destroyed, ->disconnect() is called, which is mem_allocator_disconnect(). This function internally acquires mutex_lock(). If the driver uses XDP, it registers a memory model with xdp_rxq_info_reg_mem_model(). The xdp_rxq_info_reg_mem_model() internally increases a page pool reference count if a memory model is a page pool. Now the reference count is 2. To destroy a page pool, the driver should call both page_pool_destroy() and xdp_unreg_mem_model(). The xdp_unreg_mem_model() internally calls page_pool_destroy(). Only page_pool_destroy() decreases a reference count. If a driver calls page_pool_destroy() then xdp_unreg_mem_model(), we will face an invalid wait context warning. Because xdp_unreg_mem_model() calls page_pool_destroy() with rcu_read_lock(). The page_pool_destroy() internally acquires mutex_lock(). Splat looks like: ============================= [ BUG: Invalid wait context ] 6.10.0-rc6+ #4 Tainted: G W ----------------------------- ethtool/1806 is trying to lock: ffffffff90387b90 (mem_id_lock){+.+.}-{4:4}, at: mem_allocator_disconnect+0x73/0x150 other info that might help us debug this: context-{5:5} 3 locks held by ethtool/1806: stack backtrace: CPU: 0 PID: 1806 Comm: ethtool Tainted: G W 6.10.0-rc6+ #4 f916f41f172891c800f2fed Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021 Call Trace: <TASK> dump_stack_lvl+0x7e/0xc0 __lock_acquire+0x1681/0x4de0 ? _printk+0x64/0xe0 ? __pfx_mark_lock.part.0+0x10/0x10 ? __pfx___lock_acquire+0x10/0x10 lock_acquire+0x1b3/0x580 ? mem_allocator_disconnect+0x73/0x150 ? • https://git.kernel.org/stable/c/c3f812cea0d7006469d1cf33a4a9f0a12bb4b3a3 https://git.kernel.org/stable/c/bf22306d92ca59c59dc4aa3bab14768948193d56 https://git.kernel.org/stable/c/05f646cb2174d1a4e032b60b99097f5c4b522616 https://git.kernel.org/stable/c/be9d08ff102df3ac4f66e826ea935cf3af63a4bd https://git.kernel.org/stable/c/6c390ef198aa69795427a5cb5fd7cb4bc7e6cd7a https://git.kernel.org/stable/c/3fc1be360b99baeea15cdee3cf94252cd3a72d26 https://git.kernel.org/stable/c/bf0ce5aa5f2525ed1b921ba36de96e458e77f482 https://git.kernel.org/stable/c/12144069209eec7f2090ce9afa15acdcc •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-43833 – media: v4l: async: Fix NULL pointer dereference in adding ancillary links
https://notcve.org/view.php?id=CVE-2024-43833
In the Linux kernel, the following vulnerability has been resolved: media: v4l: async: Fix NULL pointer dereference in adding ancillary links In v4l2_async_create_ancillary_links(), ancillary links are created for lens and flash sub-devices. These are sub-device to sub-device links and if the async notifier is related to a V4L2 device, the source sub-device of the ancillary link is NULL, leading to a NULL pointer dereference. Check the notifier's sd field is non-NULL in v4l2_async_create_ancillary_links(). [Sakari Ailus: Reword the subject and commit messages slightly.] • https://git.kernel.org/stable/c/aa4faf6eb27132532d5a133d9241254c16d4bafa https://git.kernel.org/stable/c/fe0f92fd5320b393e44ca210805e653ea90cc982 https://git.kernel.org/stable/c/249212ceb4187783af3801c57b92a5a25d410621 https://git.kernel.org/stable/c/b87e28050d9b0959de24574d587825cfab2f13fb https://git.kernel.org/stable/c/9b4667ea67854f0b116fe22ad11ef5628c5b5b5f •