CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47418 – net_sched: fix NULL deref in fifo_set_limit()
https://notcve.org/view.php?id=CVE-2021-47418
In the Linux kernel, the following vulnerability has been resolved: net_sched: fix NULL deref in fifo_set_limit() syzbot reported another NULL deref in fifo_set_limit() [1] I could repro the issue with : unshare -n tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit tc qd replace dev lo parent 1:0 pfifo_fast tc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit pfifo_fast does not have a change() operation. Make fifo_set_limit() more robust about this. [1] BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000 RBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910 R13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800 FS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fifo_set_limit net/sched/sch_fifo.c:242 [inline] fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227 tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418 qdisc_change net/sched/sch_api.c:1332 [inline] tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net_sched: corrige el deref NULL en fifo_set_limit() syzbot informó otro deref NULL en fifo_set_limit() [1] Podría reproducir el problema con: unshare -n tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit tc qd reemplazar dev lo parent 1:0 pfifo_fast tc qd cambiar dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit pfifo_fast no tiene una operación de cambio(). Haga que fifo_set_limit() sea más sólido al respecto. [1] BUG: desreferencia del puntero NULL del kernel, dirección: 0000000000000000 PGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0 Ups: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14443 Comm: syz-executor959 No contaminado 5. 15.0-rc3- syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Código: No se puede acceder a los bytes del código de operación en RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: c27910 RDI: ffff888071e34000 RBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947 R10: 00000000000000001 R11: 0000000000000000 R12 : ffff888024c27910 R13: ffff888071e34018 R14: 00000000000000000 R15: ffff88801ef74800 FS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 50033 CR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 00000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: fifo_set_limit net/sched/sch_fifo.c:242 [en línea] fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227 6ec/0x16d0 net/sched/sch_tbf.c: 418 qdisc_change net/sched/sch_api.c:1332 [en línea] tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x42 0 red/enlace de red /af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [en línea] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/ socket.c:704 [en línea] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0 x1b0 neto /socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [en línea] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x44/0xae • https://git.kernel.org/stable/c/fb0305ce1b03f6ff17f84f2c63daccecb45f2805 https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52 https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4 https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9 https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87 https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67 https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2021-47417 – libbpf: Fix memory leak in strset
https://notcve.org/view.php?id=CVE-2021-47417
In the Linux kernel, the following vulnerability has been resolved: libbpf: Fix memory leak in strset Free struct strset itself, not just its internal parts. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: libbpf: repara la pérdida de memoria en strset Libera la estructura strset en sí, no solo sus partes internas. • https://git.kernel.org/stable/c/90d76d3ececc74bf43b2a97f178dadfa1e52be54 https://git.kernel.org/stable/c/9e8e7504e09831c469b67d6dc11d9a72654bdb8c https://git.kernel.org/stable/c/b0e875bac0fab3e7a7431c2eee36a8ccc0c712ac •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47416 – phy: mdio: fix memory leak
https://notcve.org/view.php?id=CVE-2021-47416
In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: phy: mdio: arreglar pérdida de memoria. Syzbot informó una pérdida de memoria en la interfaz del bus MDIO, el problema estaba en una lógica de estado incorrecta. • https://git.kernel.org/stable/c/46abc02175b3c246dd5141d878f565a8725060c9 https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2021-47415 – iwlwifi: mvm: Fix possible NULL dereference
https://notcve.org/view.php?id=CVE-2021-47415
In the Linux kernel, the following vulnerability has been resolved: iwlwifi: mvm: Fix possible NULL dereference In __iwl_mvm_remove_time_event() check that 'te_data->vif' is NULL before dereferencing it. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iwlwifi: mvm: Corrige posible desreferencia NULL En __iwl_mvm_remove_time_event() comprueba que 'te_data->vif' sea NULL antes de desreferenciarlo. • https://git.kernel.org/stable/c/7b3954a1d69a992a781e71036950f9254f8147f6 https://git.kernel.org/stable/c/432d8185e9ffce97e3866ca71c39b0807a456920 https://git.kernel.org/stable/c/24d5f16e407b75bc59d5419b957a9cab423b2681 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47414 – riscv: Flush current cpu icache before other cpus
https://notcve.org/view.php?id=CVE-2021-47414
In the Linux kernel, the following vulnerability has been resolved: riscv: Flush current cpu icache before other cpus On SiFive Unmatched, I recently fell onto the following BUG when booting: [ 0.000000] ftrace: allocating 36610 entries in 144 pages [ 0.000000] Oops - illegal instruction [#1] [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.1+ #5 [ 0.000000] Hardware name: SiFive HiFive Unmatched A00 (DT) [ 0.000000] epc : riscv_cpuid_to_hartid_mask+0x6/0xae [ 0.000000] ra : __sbi_rfence_v02+0xc8/0x10a [ 0.000000] epc : ffffffff80007240 ra : ffffffff80009964 sp : ffffffff81803e10 [ 0.000000] gp : ffffffff81a1ea70 tp : ffffffff8180f500 t0 : ffffffe07fe30000 [ 0.000000] t1 : 0000000000000004 t2 : 0000000000000000 s0 : ffffffff81803e60 [ 0.000000] s1 : 0000000000000000 a0 : ffffffff81a22238 a1 : ffffffff81803e10 [ 0.000000] a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.000000] a5 : 0000000000000000 a6 : ffffffff8000989c a7 : 0000000052464e43 [ 0.000000] s2 : ffffffff81a220c8 s3 : 0000000000000000 s4 : 0000000000000000 [ 0.000000] s5 : 0000000000000000 s6 : 0000000200000100 s7 : 0000000000000001 [ 0.000000] s8 : ffffffe07fe04040 s9 : ffffffff81a22c80 s10: 0000000000001000 [ 0.000000] s11: 0000000000000004 t3 : 0000000000000001 t4 : 0000000000000008 [ 0.000000] t5 : ffffffcf04000808 t6 : ffffffe3ffddf188 [ 0.000000] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000002 [ 0.000000] [<ffffffff80007240>] riscv_cpuid_to_hartid_mask+0x6/0xae [ 0.000000] [<ffffffff80009474>] sbi_remote_fence_i+0x1e/0x26 [ 0.000000] [<ffffffff8000b8f4>] flush_icache_all+0x12/0x1a [ 0.000000] [<ffffffff8000666c>] patch_text_nosync+0x26/0x32 [ 0.000000] [<ffffffff8000884e>] ftrace_init_nop+0x52/0x8c [ 0.000000] [<ffffffff800f051e>] ftrace_process_locs.isra.0+0x29c/0x360 [ 0.000000] [<ffffffff80a0e3c6>] ftrace_init+0x80/0x130 [ 0.000000] [<ffffffff80a00f8c>] start_kernel+0x5c4/0x8f6 [ 0.000000] ---[ end trace f67eb9af4d8d492b ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- While ftrace is looping over a list of addresses to patch, it always failed when patching the same function: riscv_cpuid_to_hartid_mask. Looking at the backtrace, the illegal instruction is encountered in this same function. However, patch_text_nosync, after patching the instructions, calls flush_icache_range. But looking at what happens in this function: flush_icache_range -> flush_icache_all -> sbi_remote_fence_i -> __sbi_rfence_v02 -> riscv_cpuid_to_hartid_mask The icache and dcache of the current cpu are never synchronized between the patching of riscv_cpuid_to_hartid_mask and calling this same function. So fix this by flushing the current cpu's icache before asking for the other cpus to do the same. • https://git.kernel.org/stable/c/fab957c11efe2f405e08b9f0d080524bc2631428 https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3 https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce •