| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2023-52803: SUNRPC: Fix RPC client cleaned up the freed pipefs dentries |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| SUNRPC: Fix RPC client cleaned up the freed pipefs dentries |
| |
| RPC client pipefs dentries cleanup is in separated rpc_remove_pipedir() |
| workqueue,which takes care about pipefs superblock locking. |
| In some special scenarios, when kernel frees the pipefs sb of the |
| current client and immediately alloctes a new pipefs sb, |
| rpc_remove_pipedir function would misjudge the existence of pipefs |
| sb which is not the one it used to hold. As a result, |
| the rpc_remove_pipedir would clean the released freed pipefs dentries. |
| |
| To fix this issue, rpc_remove_pipedir should check whether the |
| current pipefs sb is consistent with the original pipefs sb. |
| |
| This error can be catched by KASAN: |
| ========================================================= |
| [ 250.497700] BUG: KASAN: slab-use-after-free in dget_parent+0x195/0x200 |
| [ 250.498315] Read of size 4 at addr ffff88800a2ab804 by task kworker/0:18/106503 |
| [ 250.500549] Workqueue: events rpc_free_client_work |
| [ 250.501001] Call Trace: |
| [ 250.502880] kasan_report+0xb6/0xf0 |
| [ 250.503209] ? dget_parent+0x195/0x200 |
| [ 250.503561] dget_parent+0x195/0x200 |
| [ 250.503897] ? __pfx_rpc_clntdir_depopulate+0x10/0x10 |
| [ 250.504384] rpc_rmdir_depopulate+0x1b/0x90 |
| [ 250.504781] rpc_remove_client_dir+0xf5/0x150 |
| [ 250.505195] rpc_free_client_work+0xe4/0x230 |
| [ 250.505598] process_one_work+0x8ee/0x13b0 |
| ... |
| [ 22.039056] Allocated by task 244: |
| [ 22.039390] kasan_save_stack+0x22/0x50 |
| [ 22.039758] kasan_set_track+0x25/0x30 |
| [ 22.040109] __kasan_slab_alloc+0x59/0x70 |
| [ 22.040487] kmem_cache_alloc_lru+0xf0/0x240 |
| [ 22.040889] __d_alloc+0x31/0x8e0 |
| [ 22.041207] d_alloc+0x44/0x1f0 |
| [ 22.041514] __rpc_lookup_create_exclusive+0x11c/0x140 |
| [ 22.041987] rpc_mkdir_populate.constprop.0+0x5f/0x110 |
| [ 22.042459] rpc_create_client_dir+0x34/0x150 |
| [ 22.042874] rpc_setup_pipedir_sb+0x102/0x1c0 |
| [ 22.043284] rpc_client_register+0x136/0x4e0 |
| [ 22.043689] rpc_new_client+0x911/0x1020 |
| [ 22.044057] rpc_create_xprt+0xcb/0x370 |
| [ 22.044417] rpc_create+0x36b/0x6c0 |
| ... |
| [ 22.049524] Freed by task 0: |
| [ 22.049803] kasan_save_stack+0x22/0x50 |
| [ 22.050165] kasan_set_track+0x25/0x30 |
| [ 22.050520] kasan_save_free_info+0x2b/0x50 |
| [ 22.050921] __kasan_slab_free+0x10e/0x1a0 |
| [ 22.051306] kmem_cache_free+0xa5/0x390 |
| [ 22.051667] rcu_core+0x62c/0x1930 |
| [ 22.051995] __do_softirq+0x165/0x52a |
| [ 22.052347] |
| [ 22.052503] Last potentially related work creation: |
| [ 22.052952] kasan_save_stack+0x22/0x50 |
| [ 22.053313] __kasan_record_aux_stack+0x8e/0xa0 |
| [ 22.053739] __call_rcu_common.constprop.0+0x6b/0x8b0 |
| [ 22.054209] dentry_free+0xb2/0x140 |
| [ 22.054540] __dentry_kill+0x3be/0x540 |
| [ 22.054900] shrink_dentry_list+0x199/0x510 |
| [ 22.055293] shrink_dcache_parent+0x190/0x240 |
| [ 22.055703] do_one_tree+0x11/0x40 |
| [ 22.056028] shrink_dcache_for_umount+0x61/0x140 |
| [ 22.056461] generic_shutdown_super+0x70/0x590 |
| [ 22.056879] kill_anon_super+0x3a/0x60 |
| [ 22.057234] rpc_kill_sb+0x121/0x200 |
| |
| The Linux kernel CVE team has assigned CVE-2023-52803 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 4.19.318 with commit 17866066b8ac1cc38fb449670bc15dc9fee4b40a |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 5.4.280 with commit 7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5 |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 5.10.202 with commit dedf2a0eb9448ae73b270743e6ea9b108189df46 |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 5.15.140 with commit 194454afa6aa9d6ed74f0c57127bc8beb27c20df |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 6.1.64 with commit 7749fd2dbef72a52b5c9ffdbf877691950ed4680 |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 6.5.13 with commit 1cdb52ffd6600a37bd355d8dce58ecd03e55e618 |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 6.6.3 with commit cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a |
| Issue introduced in 3.4 with commit 0157d021d23a087eecfa830502f81cfe843f0d16 and fixed in 6.7 with commit bfca5fb4e97c46503ddfc582335917b0cc228264 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2023-52803 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| include/linux/sunrpc/clnt.h |
| net/sunrpc/clnt.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/17866066b8ac1cc38fb449670bc15dc9fee4b40a |
| https://git.kernel.org/stable/c/7d61d1da2ed1f682c41cae0c8d4719cdaccee5c5 |
| https://git.kernel.org/stable/c/dedf2a0eb9448ae73b270743e6ea9b108189df46 |
| https://git.kernel.org/stable/c/194454afa6aa9d6ed74f0c57127bc8beb27c20df |
| https://git.kernel.org/stable/c/7749fd2dbef72a52b5c9ffdbf877691950ed4680 |
| https://git.kernel.org/stable/c/1cdb52ffd6600a37bd355d8dce58ecd03e55e618 |
| https://git.kernel.org/stable/c/cc2e7ebbeb1d0601f7f3c8d93b78fcc03a95e44a |
| https://git.kernel.org/stable/c/bfca5fb4e97c46503ddfc582335917b0cc228264 |
