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nfs: Handle error of rpc_proc_register() in nfs_net_init().
jira LE-3201 cve CVE-2024-36939 Rebuild_History Non-Buildable kernel-rt-4.18.0-553.22.1.rt7.363.el8_10 Rebuild_CHGLOG: - nfs: handle error of rpc_proc_register() in init_nfs_fs() (Scott Mayhew) [RHEL-39904] {CVE-2024-36939} Rebuild_FUZZ: 86.21% commit-author Kuniyuki Iwashima <[email protected]> commit 24457f1 Empty-Commit: Cherry-Pick Conflicts during history rebuild. Will be included in final tarball splat. Ref for failed cherry-pick at: ciq/ciq_backports/kernel-rt-4.18.0-553.22.1.rt7.363.el8_10/24457f1b.failed syzkaller reported a warning [0] triggered while destroying immature netns. rpc_proc_register() was called in init_nfs_fs(), but its error has been ignored since at least the initial commit 1da177e ("Linux-2.6.12-rc2"). Recently, commit d47151b ("nfs: expose /proc/net/sunrpc/nfs in net namespaces") converted the procfs to per-netns and made the problem more visible. Even when rpc_proc_register() fails, nfs_net_init() could succeed, and thus nfs_net_exit() will be called while destroying the netns. Then, remove_proc_entry() will be called for non-existing proc directory and trigger the warning below. Let's handle the error of rpc_proc_register() properly in nfs_net_init(). [0]: name 'nfs' WARNING: CPU: 1 PID: 1710 at fs/proc/generic.c:711 remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711 Modules linked in: CPU: 1 PID: 1710 Comm: syz-executor.2 Not tainted 6.8.0-12822-gcd51db110a7e #12 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711 Code: 41 5d 41 5e c3 e8 85 09 b5 ff 48 c7 c7 88 58 64 86 e8 09 0e 71 02 e8 74 09 b5 ff 4c 89 e6 48 c7 c7 de 1b 80 84 e8 c5 ad 97 ff <0f> 0b eb b1 e8 5c 09 b5 ff 48 c7 c7 88 58 64 86 e8 e0 0d 71 02 eb RSP: 0018:ffffc9000c6d7ce0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880422b8b00 RCX: ffffffff8110503c RDX: ffff888030652f00 RSI: ffffffff81105045 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff81bb62cb R12: ffffffff84807ffc R13: ffff88804ad6fcc0 R14: ffffffff84807ffc R15: ffffffff85741ff8 FS: 00007f30cfba8640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff51afe8000 CR3: 000000005a60a005 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> rpc_proc_unregister+0x64/0x70 net/sunrpc/stats.c:310 nfs_net_exit+0x1c/0x30 fs/nfs/inode.c:2438 ops_exit_list+0x62/0xb0 net/core/net_namespace.c:170 setup_net+0x46c/0x660 net/core/net_namespace.c:372 copy_net_ns+0x244/0x590 net/core/net_namespace.c:505 create_new_namespaces+0x2ed/0x770 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xae/0x160 kernel/nsproxy.c:228 ksys_unshare+0x342/0x760 kernel/fork.c:3322 __do_sys_unshare kernel/fork.c:3393 [inline] __se_sys_unshare kernel/fork.c:3391 [inline] __x64_sys_unshare+0x1f/0x30 kernel/fork.c:3391 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x4f/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x46/0x4e RIP: 0033:0x7f30d0febe5d Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48 RSP: 002b:00007f30cfba7cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00000000004bbf80 RCX: 00007f30d0febe5d RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c020600 RBP: 00000000004bbf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 000000000000000b R14: 00007f30d104c530 R15: 0000000000000000 </TASK> Fixes: 1da177e ("Linux-2.6.12-rc2") Reported-by: syzkaller <[email protected]> Signed-off-by: Kuniyuki Iwashima <[email protected]> Signed-off-by: Trond Myklebust <[email protected]> (cherry picked from commit 24457f1) Signed-off-by: Jonathan Maple <[email protected]> # Conflicts: # fs/nfs/inode.c
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‎ciq/ciq_backports/kernel-rt-4.18.0-553.22.1.rt7.363.el8_10/24457f1b.failed

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nfs: Handle error of rpc_proc_register() in nfs_net_init().
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jira LE-3201
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cve CVE-2024-36939
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Rebuild_History Non-Buildable kernel-rt-4.18.0-553.22.1.rt7.363.el8_10
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Rebuild_CHGLOG: - nfs: handle error of rpc_proc_register() in init_nfs_fs() (Scott Mayhew) [RHEL-39904] {CVE-2024-36939}
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Rebuild_FUZZ: 86.21%
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commit-author Kuniyuki Iwashima <[email protected]>
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commit 24457f1be29f1e7042e50a7749f5c2dde8c433c8
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Empty-Commit: Cherry-Pick Conflicts during history rebuild.
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Will be included in final tarball splat. Ref for failed cherry-pick at:
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ciq/ciq_backports/kernel-rt-4.18.0-553.22.1.rt7.363.el8_10/24457f1b.failed
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syzkaller reported a warning [0] triggered while destroying immature
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netns.
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rpc_proc_register() was called in init_nfs_fs(), but its error
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has been ignored since at least the initial commit 1da177e4c3f4
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("Linux-2.6.12-rc2").
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Recently, commit d47151b79e32 ("nfs: expose /proc/net/sunrpc/nfs
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in net namespaces") converted the procfs to per-netns and made
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the problem more visible.
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Even when rpc_proc_register() fails, nfs_net_init() could succeed,
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and thus nfs_net_exit() will be called while destroying the netns.
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Then, remove_proc_entry() will be called for non-existing proc
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directory and trigger the warning below.
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Let's handle the error of rpc_proc_register() properly in nfs_net_init().
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[0]:
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name 'nfs'
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WARNING: CPU: 1 PID: 1710 at fs/proc/generic.c:711 remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711
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Modules linked in:
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CPU: 1 PID: 1710 Comm: syz-executor.2 Not tainted 6.8.0-12822-gcd51db110a7e #12
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Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
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RIP: 0010:remove_proc_entry+0x1bb/0x2d0 fs/proc/generic.c:711
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Code: 41 5d 41 5e c3 e8 85 09 b5 ff 48 c7 c7 88 58 64 86 e8 09 0e 71 02 e8 74 09 b5 ff 4c 89 e6 48 c7 c7 de 1b 80 84 e8 c5 ad 97 ff <0f> 0b eb b1 e8 5c 09 b5 ff 48 c7 c7 88 58 64 86 e8 e0 0d 71 02 eb
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RSP: 0018:ffffc9000c6d7ce0 EFLAGS: 00010286
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RAX: 0000000000000000 RBX: ffff8880422b8b00 RCX: ffffffff8110503c
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RDX: ffff888030652f00 RSI: ffffffff81105045 RDI: 0000000000000001
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RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
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R10: 0000000000000001 R11: ffffffff81bb62cb R12: ffffffff84807ffc
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R13: ffff88804ad6fcc0 R14: ffffffff84807ffc R15: ffffffff85741ff8
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FS: 00007f30cfba8640(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
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CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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CR2: 00007ff51afe8000 CR3: 000000005a60a005 CR4: 0000000000770ef0
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DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
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DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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PKRU: 55555554
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Call Trace:
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<TASK>
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rpc_proc_unregister+0x64/0x70 net/sunrpc/stats.c:310
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nfs_net_exit+0x1c/0x30 fs/nfs/inode.c:2438
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ops_exit_list+0x62/0xb0 net/core/net_namespace.c:170
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setup_net+0x46c/0x660 net/core/net_namespace.c:372
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copy_net_ns+0x244/0x590 net/core/net_namespace.c:505
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create_new_namespaces+0x2ed/0x770 kernel/nsproxy.c:110
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unshare_nsproxy_namespaces+0xae/0x160 kernel/nsproxy.c:228
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ksys_unshare+0x342/0x760 kernel/fork.c:3322
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__do_sys_unshare kernel/fork.c:3393 [inline]
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__se_sys_unshare kernel/fork.c:3391 [inline]
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__x64_sys_unshare+0x1f/0x30 kernel/fork.c:3391
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do_syscall_x64 arch/x86/entry/common.c:52 [inline]
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do_syscall_64+0x4f/0x110 arch/x86/entry/common.c:83
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entry_SYSCALL_64_after_hwframe+0x46/0x4e
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RIP: 0033:0x7f30d0febe5d
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Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48
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RSP: 002b:00007f30cfba7cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
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RAX: ffffffffffffffda RBX: 00000000004bbf80 RCX: 00007f30d0febe5d
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RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c020600
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RBP: 00000000004bbf80 R08: 0000000000000000 R09: 0000000000000000
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R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
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R13: 000000000000000b R14: 00007f30d104c530 R15: 0000000000000000
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</TASK>
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Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
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Reported-by: syzkaller <[email protected]>
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Signed-off-by: Kuniyuki Iwashima <[email protected]>
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Signed-off-by: Trond Myklebust <[email protected]>
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(cherry picked from commit 24457f1be29f1e7042e50a7749f5c2dde8c433c8)
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Signed-off-by: Jonathan Maple <[email protected]>
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# Conflicts:
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# fs/nfs/inode.c
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diff --cc fs/nfs/inode.c
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index 912b54461f53,6fe4b47c3928..000000000000
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--- a/fs/nfs/inode.c
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+++ b/fs/nfs/inode.c
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@@@ -2349,7 -2426,15 +2349,16 @@@ EXPORT_SYMBOL_GPL(nfs_net_id)
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static int nfs_net_init(struct net *net)
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{
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- struct nfs_net *nn = net_generic(net, nfs_net_id);
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-
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nfs_clients_init(net);
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++<<<<<<< HEAD
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++=======
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+
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+ if (!rpc_proc_register(net, &nn->rpcstats)) {
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+ nfs_clients_exit(net);
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+ return -ENOMEM;
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+ }
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+
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++>>>>>>> 24457f1be29f (nfs: Handle error of rpc_proc_register() in nfs_net_init().)
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return nfs_fs_proc_net_init(net);
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}
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* Unmerged path fs/nfs/inode.c

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