[ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() #189

thefossguy-ciq · 2025-04-01T18:18:22Z

Commit Message Requirements
Built against Vault/LTS Environment
kABI Check Passed, where Valid (Pre 9.4 RT does not have kABI stability)
Boot Test
Kernel SelfTest results
Additional Tests as determined relevant

Commit message

jira VULN-36331
cve CVE-2023-52922
commit-author YueHaibing <[email protected]>
commit 55c3b96074f3f9b0aee19bf93cd71af7516582bb

BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80 Read of size 8 at addr ffff888155846230 by task cat/7862

CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace:
 <TASK>
 dump_stack_lvl+0xd5/0x150
 print_report+0xc1/0x5e0
 kasan_report+0xba/0xf0
 bcm_proc_show+0x969/0xa80
 seq_read_iter+0x4f6/0x1260
 seq_read+0x165/0x210
 proc_reg_read+0x227/0x300
 vfs_read+0x1d5/0x8d0
 ksys_read+0x11e/0x240
 do_syscall_64+0x35/0xb0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Allocated by task 7846:
 kasan_save_stack+0x1e/0x40
 kasan_set_track+0x21/0x30
 __kasan_kmalloc+0x9e/0xa0
 bcm_sendmsg+0x264b/0x44e0
 sock_sendmsg+0xda/0x180
 ____sys_sendmsg+0x735/0x920
 ___sys_sendmsg+0x11d/0x1b0
 __sys_sendmsg+0xfa/0x1d0
 do_syscall_64+0x35/0xb0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 7846:
 kasan_save_stack+0x1e/0x40
 kasan_set_track+0x21/0x30
 kasan_save_free_info+0x27/0x40
 ____kasan_slab_free+0x161/0x1c0
 slab_free_freelist_hook+0x119/0x220
 __kmem_cache_free+0xb4/0x2e0
 rcu_core+0x809/0x1bd0

bcm_op is freed before procfs entry be removed in bcm_release(), this lead to bcm_proc_show() may read the freed bcm_op.

Fixes: ffd980f976e7 ("[CAN]: Add broadcast manager (bcm) protocol")
	Signed-off-by: YueHaibing <[email protected]>
	Reviewed-by: Oliver Hartkopp <[email protected]>
	Acked-by: Oliver Hartkopp <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
	Cc: [email protected]
	Signed-off-by: Marc Kleine-Budde <[email protected]>
(cherry picked from commit 55c3b96074f3f9b0aee19bf93cd71af7516582bb)
	Signed-off-by: Pratham Patel <[email protected]>

Kernel build logs

/run/media/kernel/kernel-src-tree
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x86_64 architecture detected, copying config
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Setting Local Version for build
CONFIG_LOCALVERSION="-_ppatel__ciqlts8_6-9d5962ee5f58"
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scripts/kconfig/conf  --olddefconfig Kconfig
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kernel-build.log

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210
210

$ grep '^not ok ' kselftest-before.log | wc -l && grep '^not ok ' kselftest-after.log | wc -l
56
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kselftest-after.log
kselftest-before.log

jira VULN-36331 cve CVE-2023-52922 commit-author YueHaibing <[email protected]> commit 55c3b96 BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80 Read of size 8 at addr ffff888155846230 by task cat/7862 CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xd5/0x150 print_report+0xc1/0x5e0 kasan_report+0xba/0xf0 bcm_proc_show+0x969/0xa80 seq_read_iter+0x4f6/0x1260 seq_read+0x165/0x210 proc_reg_read+0x227/0x300 vfs_read+0x1d5/0x8d0 ksys_read+0x11e/0x240 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Allocated by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x9e/0xa0 bcm_sendmsg+0x264b/0x44e0 sock_sendmsg+0xda/0x180 ____sys_sendmsg+0x735/0x920 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfa/0x1d0 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x161/0x1c0 slab_free_freelist_hook+0x119/0x220 __kmem_cache_free+0xb4/0x2e0 rcu_core+0x809/0x1bd0 bcm_op is freed before procfs entry be removed in bcm_release(), this lead to bcm_proc_show() may read the freed bcm_op. Fixes: ffd980f ("[CAN]: Add broadcast manager (bcm) protocol") Signed-off-by: YueHaibing <[email protected]> Reviewed-by: Oliver Hartkopp <[email protected]> Acked-by: Oliver Hartkopp <[email protected]> Link: https://lore.kernel.org/all/[email protected] Cc: [email protected] Signed-off-by: Marc Kleine-Budde <[email protected]> (cherry picked from commit 55c3b96) Signed-off-by: Pratham Patel <[email protected]>

bmastbergen

🥌

PlaidCat

[ Upstream commit 5ed3b0c ] When cur_qp isn't NULL, in order to avoid fetching the QP from the radix tree again we check if the next cqe QP is identical to the one we already have. The bug however is that we are checking if the QP is identical by checking the QP number inside the CQE against the QP number inside the mlx5_ib_qp, but that's wrong since the QP number from the CQE is from FW so it should be matched against mlx5_core_qp which is our FW QP number. Otherwise we could use the wrong QP when handling a CQE which could cause the kernel trace below. This issue is mainly noticeable over QPs 0 & 1, since for now they are the only QPs in our driver whereas the QP number inside mlx5_ib_qp doesn't match the QP number inside mlx5_core_qp. BUG: kernel NULL pointer dereference, address: 0000000000000012 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP CPU: 0 UID: 0 PID: 7927 Comm: kworker/u62:1 Not tainted 6.14.0-rc3+ #189 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core] RIP: 0010:mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib] Code: 03 00 00 8d 58 ff 21 cb 66 39 d3 74 39 48 c7 c7 3c 89 6e a0 0f b7 db e8 b7 d2 b3 e0 49 8b 86 60 03 00 00 48 c7 c7 4a 89 6e a0 <0f> b7 5c 98 02 e8 9f d2 b3 e0 41 0f b7 86 78 03 00 00 83 e8 01 21 RSP: 0018:ffff88810511bd60 EFLAGS: 00010046 RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88885fa1b3c0 RDI: ffffffffa06e894a RBP: 00000000000000b0 R08: 0000000000000000 R09: ffff88810511bc10 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88810d593000 R13: ffff88810e579108 R14: ffff888105146000 R15: 00000000000000b0 FS: 0000000000000000(0000) GS:ffff88885fa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000012 CR3: 00000001077e6001 CR4: 0000000000370eb0 Call Trace: <TASK> ? __die+0x20/0x60 ? page_fault_oops+0x150/0x3e0 ? exc_page_fault+0x74/0x130 ? asm_exc_page_fault+0x22/0x30 ? mlx5_ib_poll_cq+0x4c7/0xd90 [mlx5_ib] __ib_process_cq+0x5a/0x150 [ib_core] ib_cq_poll_work+0x31/0x90 [ib_core] process_one_work+0x169/0x320 worker_thread+0x288/0x3a0 ? work_busy+0xb0/0xb0 kthread+0xd7/0x1f0 ? kthreads_online_cpu+0x130/0x130 ? kthreads_online_cpu+0x130/0x130 ret_from_fork+0x2d/0x50 ? kthreads_online_cpu+0x130/0x130 ret_from_fork_asm+0x11/0x20 </TASK> Fixes: e126ba9 ("mlx5: Add driver for Mellanox Connect-IB adapters") Signed-off-by: Patrisious Haddad <[email protected]> Reviewed-by: Edward Srouji <[email protected]> Link: https://patch.msgid.link/4ada09d41f1e36db62c44a9b25c209ea5f054316.1741875692.git.leon@kernel.org Signed-off-by: Leon Romanovsky <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

thefossguy-ciq changed the title ~~can: bcm: Fix UAF in bcm_proc_show()~~ [ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() Apr 1, 2025

thefossguy-ciq requested review from PlaidCat, bmastbergen and kerneltoast April 1, 2025 18:19

bmastbergen approved these changes Apr 1, 2025

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PlaidCat approved these changes Apr 1, 2025

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thefossguy-ciq merged commit 64795c6 into ciqlts8_6 Apr 2, 2025
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PlaidCat mentioned this pull request Jul 17, 2025

[FIPS Legacy 8] CVES: CVE-2023-52922, CVE-2023-45871, CVE-2024-0646 #423

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[ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() #189

[ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() #189

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[ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() #189

[ciqlts8_6] can: bcm: Fix UAF in bcm_proc_show() #189

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