🛡️ CVE-2025-38400 — debian-linux

nfs: Clean up /proc/net/rpc/nfs when nfs_fs_proc_net_init() fails.

In the Linux kernel, the following vulnerability has been resolved:

nfs: Clean up /proc/net/rpc/nfs when nfs_fs_proc_net_init() fails.

syzbot reported a warning below [1] following a fault injection in

nfs_fs_proc_net_init(). [0]

When nfs_fs_proc_net_init() fails, /proc/net/rpc/nfs is not removed.

Later, rpc_proc_exit() tries to remove /proc/net/rpc, and the warning

is logged as the directory is not empty.

Let's handle the error of nfs_fs_proc_net_init() properly.

[0]:

FAULT_INJECTION: forcing a failure.

name failslab, interval 1, probability 0, space 0, times 0

CPU: 1 UID: 0 PID: 6120 Comm: syz.2.27 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025

Call Trace:

<TASK>

dump_stack_lvl (lib/dump_stack.c:123)

should_fail_ex (lib/fault-inject.c:73 lib/fault-inject.c:174)

should_failslab (mm/failslab.c:46)

kmem_cache_alloc_noprof (mm/slub.c:4178 mm/slub.c:4204)

__proc_create (fs/proc/generic.c:427)

proc_create_reg (fs/proc/generic.c:554)

proc_create_net_data (fs/proc/proc_net.c:120)

nfs_fs_proc_net_init (fs/nfs/client.c:1409)

nfs_net_init (fs/nfs/inode.c:2600)

ops_init (net/core/net_namespace.c:138)

setup_net (net/core/net_namespace.c:443)

copy_net_ns (net/core/net_namespace.c:576)

create_new_namespaces (kernel/nsproxy.c:110)

unshare_nsproxy_namespaces (kernel/nsproxy.c:218 (discriminator 4))

ksys_unshare (kernel/fork.c:3123)

__x64_sys_unshare (kernel/fork.c:3190)

do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)

entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)

</TASK>

[1]:

remove_proc_entry: removing non-empty directory 'net/rpc', leaking at least 'nfs'

WARNING: CPU: 1 PID: 6120 at fs/proc/generic.c:727 remove_proc_entry+0x45e/0x530 fs/proc/generic.c:727

Modules linked in:

CPU: 1 UID: 0 PID: 6120 Comm: syz.2.27 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025

RIP: 0010:remove_proc_entry+0x45e/0x530 fs/proc/generic.c:727

Code: 3c 02 00 0f 85 85 00 00 00 48 8b 93 d8 00 00 00 4d 89 f0 4c 89 e9 48 c7 c6 40 ba a2 8b 48 c7 c7 60 b9 a2 8b e8 33 81 1d ff 90 <0f> 0b 90 90 e9 5f fe ff ff e8 04 69 5e ff 90 48 b8 00 00 00 00 00

RSP: 0018:ffffc90003637b08 EFLAGS: 00010282

RAX: 0000000000000000 RBX: ffff88805f534140 RCX: ffffffff817a92c8

RDX: ffff88807da99e00 RSI: ffffffff817a92d5 RDI: 0000000000000001

RBP: ffff888033431ac0 R08: 0000000000000001 R09: 0000000000000000

R10: 0000000000000001 R11: 0000000000000001 R12: ffff888033431a00

R13: ffff888033431ae4 R14: ffff888033184724 R15: dffffc0000000000

FS: 0000555580328500(0000) GS:ffff888124a62000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f71733743e0 CR3: 000000007f618000 CR4: 00000000003526f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

sunrpc_exit_net+0x46/0x90 net/sunrpc/sunrpc_syms.c:76

ops_exit_list net/core/net_namespace.c:200 [inline]

ops_undo_list+0x2eb/0xab0 net/core/net_namespace.c:253

setup_net+0x2e1/0x510 net/core/net_namespace.c:457

copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:574

create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110

unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218

ksys_unshare+0x45b/0xa40 kernel/fork.c:3121

__do_sys_unshare kernel/fork.c:3192 [inline]

__se_sys_unshare kernel/fork.c:3190 [inline]

__x64_sys_unshare+0x31/0x40 kernel/fork.c:3190

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

RIP: 0033:0x7fa1a6b8e929

Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c

---truncated---