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memory leak in prepare_creds (5)

Status: upstream: reported C repro on 2025/11/07 07:29
Subsystems: lsm
[Documentation on labels]
Reported-by: syzbot+099461f8558eb0a1f4f3@syzkaller.appspotmail.com
Fix commit: nfsd: fix memory leak in nfsd_create_serv error paths
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 71d, last: 2d00h
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] nfsd: fix memory leak in nfsd_create_serv error paths 3 (3) 2025/11/17 16:15
[syzbot] [lsm?] memory leak in prepare_creds (5) 0 (1) 2025/11/07 07:29
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in prepare_creds (3) lsm 3 C 24 1087d 1365d 0/29 auto-obsoleted due to no activity on 2023/05/24 05:02
upstream memory leak in prepare_creds (2) lsm 3 C 2 1665d 1760d 20/29 fixed on 2021/11/10 00:50
upstream memory leak in prepare_creds (4) lsm 3 C 5 739d 838d 0/29 auto-obsoleted due to no activity on 2024/04/17 09:09
upstream memory leak in prepare_creds lsm 3 C 10 1792d 1966d 19/29 fixed on 2021/03/10 01:48

Sample crash report:
BUG: memory leak
unreferenced object 0xffff8881021aa540 (size 184):
  comm "syz-executor", pid 5991, jiffies 4294944209
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc cdc40c64):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_noprof+0x3b4/0x590 mm/slub.c:5270
    prepare_creds+0x22/0x5e0 kernel/cred.c:185
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810991d880 (size 32):
  comm "syz-executor", pid 5991, jiffies 4294944209
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    f8 52 86 00 81 88 ff ff 00 00 00 00 00 00 00 00  .R..............
  backtrace (crc 336e1c5f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    lsm_blob_alloc+0x4d/0x70 security/security.c:192
    lsm_cred_alloc security/security.c:209 [inline]
    security_prepare_creds+0x2f/0x270 security/security.c:2763
    prepare_creds+0x385/0x5e0 kernel/cred.c:215
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888108757600 (size 184):
  comm "syz-executor", pid 5991, jiffies 4294944267
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 26a27834):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_noprof+0x3b4/0x590 mm/slub.c:5270
    prepare_creds+0x22/0x5e0 kernel/cred.c:185
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810994fb00 (size 32):
  comm "syz-executor", pid 5991, jiffies 4294944267
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    f8 52 86 00 81 88 ff ff 00 00 00 00 00 00 00 00  .R..............
  backtrace (crc 336e1c5f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    lsm_blob_alloc+0x4d/0x70 security/security.c:192
    lsm_cred_alloc security/security.c:209 [inline]
    security_prepare_creds+0x2f/0x270 security/security.c:2763
    prepare_creds+0x385/0x5e0 kernel/cred.c:215
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888108757d80 (size 184):
  comm "syz-executor", pid 5991, jiffies 4294944343
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc d20c16cb):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_noprof+0x3b4/0x590 mm/slub.c:5270
    prepare_creds+0x22/0x5e0 kernel/cred.c:185
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810994f2e0 (size 32):
  comm "syz-executor", pid 5991, jiffies 4294944343
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    f8 52 86 00 81 88 ff ff 00 00 00 00 00 00 00 00  .R..............
  backtrace (crc 336e1c5f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    lsm_blob_alloc+0x4d/0x70 security/security.c:192
    lsm_cred_alloc security/security.c:209 [inline]
    security_prepare_creds+0x2f/0x270 security/security.c:2763
    prepare_creds+0x385/0x5e0 kernel/cred.c:215
    copy_creds+0x44/0x290 kernel/cred.c:286
    copy_process+0x979/0x2860 kernel/fork.c:2086
    kernel_clone+0x119/0x6c0 kernel/fork.c:2651
    __do_sys_clone+0x7b/0xb0 kernel/fork.c:2792
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF

Crashes (58):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/13 04:57 upstream 0f61b1860cc3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2026/01/04 14:31 upstream aacb0a6d604a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2026/01/02 08:02 upstream b69053dd3ffb d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/30 14:40 upstream 8640b74557fc d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/29 21:58 upstream 7839932417dd d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/28 14:38 upstream d26143bb38e2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/28 13:57 upstream d26143bb38e2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/25 07:08 upstream ccd1cdca5cd4 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/23 22:11 upstream b927546677c8 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/23 21:53 upstream b927546677c8 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/21 21:15 upstream 9094662f6707 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/21 20:27 upstream 9094662f6707 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/20 02:22 upstream dd9b004b7ff3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/20 00:54 upstream dd9b004b7ff3 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/18 01:30 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/18 00:51 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/17 23:50 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/17 23:12 upstream ea1013c15392 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/15 08:34 upstream 8f0b4cce4481 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/15 06:40 upstream 8f0b4cce4481 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/12 21:28 upstream 187d0801404f d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/12 20:36 upstream 187d0801404f d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/12 08:17 upstream d358e5254674 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/12 07:19 upstream d358e5254674 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/09 17:49 upstream cb015814f8b6 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/09 16:51 upstream cb015814f8b6 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/08 13:03 upstream ba65a4e7120a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/08 12:29 upstream ba65a4e7120a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/07 11:42 upstream cc3ee4ba57b7 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/07 10:36 upstream cc3ee4ba57b7 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 13:46 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 12:17 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 10:48 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 09:14 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 08:07 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 06:54 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 05:42 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/03 05:09 upstream d61f1cc5db79 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/01 06:04 upstream e69c7c175115 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/26 05:33 upstream 8a2bcda5e139 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/26 03:53 upstream 8a2bcda5e139 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/25 13:15 upstream ac3fd01e4c1e 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/25 12:06 upstream ac3fd01e4c1e 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/25 11:00 upstream ac3fd01e4c1e 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/25 09:53 upstream ac3fd01e4c1e 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/25 08:40 upstream ac3fd01e4c1e 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/24 09:24 upstream d0e88704d96c 4fb8ef37 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/24 08:15 upstream d0e88704d96c 4fb8ef37 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/21 13:15 upstream fd95357fd8c6 280ea308 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/10 16:53 upstream e9a6fb0bcdd7 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/08 05:20 upstream da32d155f4a8 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/07 15:13 upstream 4a0c9b339199 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/07 06:07 upstream c2c2ccfd4ba7 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/04 09:50 upstream 8bb886cb8f3a 686bf657 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/17 17:46 upstream ea1013c15392 d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/13 02:07 upstream 187d0801404f d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/12/12 23:18 upstream 187d0801404f d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
2025/11/07 04:56 upstream c2c2ccfd4ba7 4e1406b4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in prepare_creds
* Struck through repros no longer work on HEAD.