Description
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix crash when rebind ccp device for ccp.ko When CONFIG_CRYPTO_DEV_CCP_DEBUGFS is enabled, rebinding the ccp device causes the following crash: $ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/unbind $ echo '0000:0a:00.2' > /sys/bus/pci/drivers/ccp/bind [ 204.976930] BUG: kernel NULL pointer dereference, address: 0000000000000098 [ 204.978026] #PF: supervisor write access in kernel mode [ 204.979126] #PF: error_code(0x0002) - not-present page [ 204.980226] PGD 0 P4D 0 [ 204.981317] Oops: Oops: 0002 [#1] SMP NOPTI ... [ 204.997852] Call Trace: [ 204.999074] <TASK> [ 205.000297] start_creating+0x9f/0x1c0 [ 205.001533] debugfs_create_dir+0x1f/0x170 [ 205.002769] ? srso_return_thunk+0x5/0x5f [ 205.004000] ccp5_debugfs_setup+0x87/0x170 [ccp] [ 205.005241] ccp5_init+0x8b2/0x960 [ccp] [ 205.006469] ccp_dev_init+0xd4/0x150 [ccp] [ 205.007709] sp_init+0x5f/0x80 [ccp] [ 205.008942] sp_pci_probe+0x283/0x2e0 [ccp] [ 205.010165] ? srso_return_thunk+0x5/0x5f [ 205.011376] local_pci_probe+0x4f/0xb0 [ 205.012584] pci_device_probe+0xdb/0x230 [ 205.013810] really_probe+0xed/0x380 [ 205.015024] __driver_probe_device+0x7e/0x160 [ 205.016240] device_driver_attach+0x2f/0x60 [ 205.017457] bind_store+0x7c/0xb0 [ 205.018663] drv_attr_store+0x28/0x40 [ 205.019868] sysfs_kf_write+0x5f/0x70 [ 205.021065] kernfs_fop_write_iter+0x145/0x1d0 [ 205.022267] vfs_write+0x308/0x440 [ 205.023453] ksys_write+0x6d/0xe0 [ 205.024616] __x64_sys_write+0x1e/0x30 [ 205.025778] x64_sys_call+0x16ba/0x2150 [ 205.026942] do_syscall_64+0x56/0x1e0 [ 205.028108] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 205.029276] RIP: 0033:0x7fbc36f10104 [ 205.030420] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8d 05 e1 08 2e 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5 This patch sets ccp_debugfs_dir to NULL after destroying it in ccp5_debugfs_destroy, allowing the directory dentry to be recreated when rebinding the ccp device. Tested on AMD Ryzen 7 1700X.
Product status
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before a25ab6dfa0ce323ec308966988be6b675eb9d3e5
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before ce63a83925964ab7564bd216bd92b80bc365492e
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 20c0ed8dd65834e6bab464f54cd6ff68659bacb9
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 2d4060f05e74dbee884ba723f6afd9282befc3c5
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before db111468531777cac8b4beb6515a88a54b0c4a74
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 9dea08eac4f6d6fbbae59992978252e2edab995d
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 6eadf50c1d894cb34f3237064063207460946040
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 64ec9a7e7a6398b172ab6feba60e952163a1c3d5
3cdbe346ed3f380eae1cb3e9febfe703e7d8a7b0 before 181698af38d3f93381229ad89c09b5bd0496661a
4.13
Any version before 4.13
5.4.297
5.10.241
5.15.190
6.1.148
6.6.102
6.12.42
6.15.10
6.16.1
6.17
References
git.kernel.org/...c/a25ab6dfa0ce323ec308966988be6b675eb9d3e5
git.kernel.org/...c/ce63a83925964ab7564bd216bd92b80bc365492e
git.kernel.org/...c/20c0ed8dd65834e6bab464f54cd6ff68659bacb9
git.kernel.org/...c/2d4060f05e74dbee884ba723f6afd9282befc3c5
git.kernel.org/...c/db111468531777cac8b4beb6515a88a54b0c4a74
git.kernel.org/...c/9dea08eac4f6d6fbbae59992978252e2edab995d
git.kernel.org/...c/6eadf50c1d894cb34f3237064063207460946040
git.kernel.org/...c/64ec9a7e7a6398b172ab6feba60e952163a1c3d5
git.kernel.org/...c/181698af38d3f93381229ad89c09b5bd0496661a
