CVE-2021-47103
Vulnerability from cvelistv5
Published
2024-03-04 18:10
Modified
2024-08-08 15:23
Severity
Summary
inet: fully convert sk->sk_rx_dst to RCU rules
References
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: fully convert sk-\u003esk_rx_dst to RCU rules\n\nsyzbot reported various issues around early demux,\none being included in this changelog [1]\n\nsk-\u003esk_rx_dst is using RCU protection without clearly\ndocumenting it.\n\nAnd following sequences in tcp_v4_do_rcv()/tcp_v6_do_rcv()\nare not following standard RCU rules.\n\n[a] dst_release(dst);\n[b] sk-\u003esk_rx_dst = NULL;\n\nThey look wrong because a delete operation of RCU protected\npointer is supposed to clear the pointer before\nthe call_rcu()/synchronize_rcu() guarding actual memory freeing.\n\nIn some cases indeed, dst could be freed before [b] is done.\n\nWe could cheat by clearing sk_rx_dst before calling\ndst_release(), but this seems the right time to stick\nto standard RCU annotations and debugging facilities.\n\n[1]\nBUG: KASAN: use-after-free in dst_check include/net/dst.h:470 [inline]\nBUG: KASAN: use-after-free in tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792\nRead of size 2 at addr ffff88807f1cb73a by task syz-executor.5/9204\n\nCPU: 0 PID: 9204 Comm: syz-executor.5 Not tainted 5.16.0-rc5-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247\n __kasan_report mm/kasan/report.c:433 [inline]\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\n dst_check include/net/dst.h:470 [inline]\n tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792\n ip_rcv_finish_core.constprop.0+0x15de/0x1e80 net/ipv4/ip_input.c:340\n ip_list_rcv_finish.constprop.0+0x1b2/0x6e0 net/ipv4/ip_input.c:583\n ip_sublist_rcv net/ipv4/ip_input.c:609 [inline]\n ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:644\n __netif_receive_skb_list_ptype net/core/dev.c:5508 [inline]\n __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5556\n __netif_receive_skb_list net/core/dev.c:5608 [inline]\n netif_receive_skb_list_internal+0x75e/0xd80 net/core/dev.c:5699\n gro_normal_list net/core/dev.c:5853 [inline]\n gro_normal_list net/core/dev.c:5849 [inline]\n napi_complete_done+0x1f1/0x880 net/core/dev.c:6590\n virtqueue_napi_complete drivers/net/virtio_net.c:339 [inline]\n virtnet_poll+0xca2/0x11b0 drivers/net/virtio_net.c:1557\n __napi_poll+0xaf/0x440 net/core/dev.c:7023\n napi_poll net/core/dev.c:7090 [inline]\n net_rx_action+0x801/0xb40 net/core/dev.c:7177\n __do_softirq+0x29b/0x9c2 kernel/softirq.c:558\n invoke_softirq kernel/softirq.c:432 [inline]\n __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637\n irq_exit_rcu+0x5/0x20 kernel/softirq.c:649\n common_interrupt+0x52/0xc0 arch/x86/kernel/irq.c:240\n asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629\nRIP: 0033:0x7f5e972bfd57\nCode: 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 48 8b 50 f8 48 89 38 49 8b 0e \u003c48\u003e 8b 3e 48 83 c3 08 48 83 c6 08 eb bc 48 39 d1 72 9e 48 39 d0 73\nRSP: 002b:00007fff8a413210 EFLAGS: 00000283\nRAX: 00007f5e97108990 RBX: 00007f5e97108338 RCX: ffffffff81d3aa45\nRDX: ffffffff81d3aa45 RSI: 00007f5e97108340 RDI: ffffffff81d3aa45\nRBP: 00007f5e97107eb8 R08: 00007f5e97108d88 R09: 0000000093c2e8d9\nR10: 0000000000000000 R11: 0000000000000000 R12: 00007f5e97107eb0\nR13: 00007f5e97108338 R14: 00007f5e97107ea8 R15: 0000000000000019\n \u003c/TASK\u003e\n\nAllocated by task 13:\n kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38\n kasan_set_track mm/kasan/common.c:46 [inline]\n set_alloc_info mm/kasan/common.c:434 [inline]\n __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467\n kasan_slab_alloc include/linux/kasan.h:259 [inline]\n slab_post_alloc_hook mm/slab.h:519 [inline]\n slab_alloc_node mm/slub.c:3234 [inline]\n slab_alloc mm/slub.c:3242 [inline]\n kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3247\n dst_alloc+0x146/0x1f0 net/core/dst.c:92\n rt_dst_alloc+0x73/0x430 net/ipv4/route.c:1613\n ip_route_input_slow+0x1817/0x3a20 net/ipv4/route.c:234\n---truncated---"
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"title": "inet: fully convert sk-\u003esk_rx_dst to RCU rules",
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"datePublished": "2024-03-04T18:10:57.116Z",
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47103\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-04T18:15:08.667\",\"lastModified\":\"2024-03-05T13:41:01.900\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ninet: fully convert sk-\u003esk_rx_dst to RCU rules\\n\\nsyzbot reported various issues around early demux,\\none being included in this changelog [1]\\n\\nsk-\u003esk_rx_dst is using RCU protection without clearly\\ndocumenting it.\\n\\nAnd following sequences in tcp_v4_do_rcv()/tcp_v6_do_rcv()\\nare not following standard RCU rules.\\n\\n[a] dst_release(dst);\\n[b] sk-\u003esk_rx_dst = NULL;\\n\\nThey look wrong because a delete operation of RCU protected\\npointer is supposed to clear the pointer before\\nthe call_rcu()/synchronize_rcu() guarding actual memory freeing.\\n\\nIn some cases indeed, dst could be freed before [b] is done.\\n\\nWe could cheat by clearing sk_rx_dst before calling\\ndst_release(), but this seems the right time to stick\\nto standard RCU annotations and debugging facilities.\\n\\n[1]\\nBUG: KASAN: use-after-free in dst_check include/net/dst.h:470 [inline]\\nBUG: KASAN: use-after-free in tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792\\nRead of size 2 at addr ffff88807f1cb73a by task syz-executor.5/9204\\n\\nCPU: 0 PID: 9204 Comm: syz-executor.5 Not tainted 5.16.0-rc5-syzkaller #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\\n print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247\\n __kasan_report mm/kasan/report.c:433 [inline]\\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\\n dst_check include/net/dst.h:470 [inline]\\n tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792\\n ip_rcv_finish_core.constprop.0+0x15de/0x1e80 net/ipv4/ip_input.c:340\\n ip_list_rcv_finish.constprop.0+0x1b2/0x6e0 net/ipv4/ip_input.c:583\\n ip_sublist_rcv net/ipv4/ip_input.c:609 [inline]\\n ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:644\\n __netif_receive_skb_list_ptype net/core/dev.c:5508 [inline]\\n __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5556\\n __netif_receive_skb_list net/core/dev.c:5608 [inline]\\n netif_receive_skb_list_internal+0x75e/0xd80 net/core/dev.c:5699\\n gro_normal_list net/core/dev.c:5853 [inline]\\n gro_normal_list net/core/dev.c:5849 [inline]\\n napi_complete_done+0x1f1/0x880 net/core/dev.c:6590\\n virtqueue_napi_complete drivers/net/virtio_net.c:339 [inline]\\n virtnet_poll+0xca2/0x11b0 drivers/net/virtio_net.c:1557\\n __napi_poll+0xaf/0x440 net/core/dev.c:7023\\n napi_poll net/core/dev.c:7090 [inline]\\n net_rx_action+0x801/0xb40 net/core/dev.c:7177\\n __do_softirq+0x29b/0x9c2 kernel/softirq.c:558\\n invoke_softirq kernel/softirq.c:432 [inline]\\n __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637\\n irq_exit_rcu+0x5/0x20 kernel/softirq.c:649\\n common_interrupt+0x52/0xc0 arch/x86/kernel/irq.c:240\\n asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629\\nRIP: 0033:0x7f5e972bfd57\\nCode: 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 48 8b 50 f8 48 89 38 49 8b 0e \u003c48\u003e 8b 3e 48 83 c3 08 48 83 c6 08 eb bc 48 39 d1 72 9e 48 39 d0 73\\nRSP: 002b:00007fff8a413210 EFLAGS: 00000283\\nRAX: 00007f5e97108990 RBX: 00007f5e97108338 RCX: ffffffff81d3aa45\\nRDX: ffffffff81d3aa45 RSI: 00007f5e97108340 RDI: ffffffff81d3aa45\\nRBP: 00007f5e97107eb8 R08: 00007f5e97108d88 R09: 0000000093c2e8d9\\nR10: 0000000000000000 R11: 0000000000000000 R12: 00007f5e97107eb0\\nR13: 00007f5e97108338 R14: 00007f5e97107ea8 R15: 0000000000000019\\n \u003c/TASK\u003e\\n\\nAllocated by task 13:\\n kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38\\n kasan_set_track mm/kasan/common.c:46 [inline]\\n set_alloc_info mm/kasan/common.c:434 [inline]\\n __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467\\n kasan_slab_alloc include/linux/kasan.h:259 [inline]\\n slab_post_alloc_hook mm/slab.h:519 [inline]\\n slab_alloc_node mm/slub.c:3234 [inline]\\n slab_alloc mm/slub.c:3242 [inline]\\n kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3247\\n dst_alloc+0x146/0x1f0 net/core/dst.c:92\\n rt_dst_alloc+0x73/0x430 net/ipv4/route.c:1613\\n ip_route_input_slow+0x1817/0x3a20 net/ipv4/route.c:234\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: inet: conversi\u00f3n completa de sk-\u0026gt;sk_rx_dst a reglas de RCU syzbot inform\u00f3 varios problemas relacionados con la demux inicial, uno de los cuales se incluye en este registro de cambios [1] sk-\u0026gt;sk_rx_dst est\u00e1 usando protecci\u00f3n de RCU sin claridad document\u00e1ndolo. Y las siguientes secuencias en tcp_v4_do_rcv()/tcp_v6_do_rcv() no siguen las reglas est\u00e1ndar de RCU. [a] dst_release(dst); [b] sk-\u0026gt;sk_rx_dst = NULL; Se ven incorrectos porque se supone que una operaci\u00f3n de eliminaci\u00f3n del puntero protegido de RCU borra el puntero antes de que call_rcu()/synchronize_rcu() proteja la liberaci\u00f3n de memoria real. De hecho, en algunos casos, dst podr\u00eda liberarse antes de que se realice [b]. Podr\u00edamos hacer trampa borrando sk_rx_dst antes de llamar a dst_release(), pero este parece el momento adecuado para ce\u00f1irnos a las anotaciones est\u00e1ndar de RCU y las funciones de depuraci\u00f3n. [1] BUG: KASAN: use-after-free in dst_check include/net/dst.h:470 [inline] BUG: KASAN: use-after-free in tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792 Read of size 2 at addr ffff88807f1cb73a by task syz-executor.5/9204 CPU: 0 PID: 9204 Comm: syz-executor.5 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 dst_check include/net/dst.h:470 [inline] tcp_v4_early_demux+0x95b/0x960 net/ipv4/tcp_ipv4.c:1792 ip_rcv_finish_core.constprop.0+0x15de/0x1e80 net/ipv4/ip_input.c:340 ip_list_rcv_finish.constprop.0+0x1b2/0x6e0 net/ipv4/ip_input.c:583 ip_sublist_rcv net/ipv4/ip_input.c:609 [inline] ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:644 __netif_receive_skb_list_ptype net/core/dev.c:5508 [inline] __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5556 __netif_receive_skb_list net/core/dev.c:5608 [inline] netif_receive_skb_list_internal+0x75e/0xd80 net/core/dev.c:5699 gro_normal_list net/core/dev.c:5853 [inline] gro_normal_list net/core/dev.c:5849 [inline] napi_complete_done+0x1f1/0x880 net/core/dev.c:6590 virtqueue_napi_complete drivers/net/virtio_net.c:339 [inline] virtnet_poll+0xca2/0x11b0 drivers/net/virtio_net.c:1557 __napi_poll+0xaf/0x440 net/core/dev.c:7023 napi_poll net/core/dev.c:7090 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7177 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 common_interrupt+0x52/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 RIP: 0033:0x7f5e972bfd57 Code: 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 48 8b 50 f8 48 89 38 49 8b 0e \u0026lt;48\u0026gt; 8b 3e 48 83 c3 08 48 83 c6 08 eb bc 48 39 d1 72 9e 48 39 d0 73 RSP: 002b:00007fff8a413210 EFLAGS: 00000283 RAX: 00007f5e97108990 RBX: 00007f5e97108338 RCX: ffffffff81d3aa45 RDX: ffffffff81d3aa45 RSI: 00007f5e97108340 RDI: ffffffff81d3aa45 RBP: 00007f5e97107eb8 R08: 00007f5e97108d88 R09: 0000000093c2e8d9 R10: 0000000000000000 R11: 0000000000000000 R12: 00007f5e97107eb0 R13: 00007f5e97108338 R14: 00007f5e97107ea8 R15: 0000000000000019 Allocated by task 13: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3247 dst_alloc+0x146/0x1f0 net/core/dst.c:92 rt_dst_alloc+0x73/0x430 net/ipv4/route.c:1613 ip_route_input_slow+0x1817/0x3a20 net/ipv4/route.c:234\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0249a4b8a554f2eb6a27b62516fa50168584faa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68c34ce11ef23328692aa35fa6aaafdd75913100\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/75a578000ae5e511e5d0e8433c94a14d9c99c412\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f905c0e7354ef261360fb7535ea079b1082c105\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92e6e36ecd16808866ac6172b9491b5097cde449\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3bb4a7e8cbc984e1cdac0fe6af60e880214ed6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f039b43cbaea5e0700980c2f0052da05a70782e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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