syzbot <[email protected]> writes:
> syzbot has found a reproducer for the following issue on: > > HEAD commit: 99c710c4 Merge tag 'platform-drivers-x86-v5.10-2' of git:/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12a77ddd500000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c7a27a77f20fbc95 > dashboard link: https://syzkaller.appspot.com/bug?extid=71c4697e27c99fddcf17 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d6161d500000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f15e65500000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] My guess is someones error cleanup somewhere did the wrong thing. It looks like there was one forced failure in tomoyo and the rest were in io_uring. Adding the relevant maintainers perhaps one of them can see the problem. > > BUG: memory leak > unreferenced object 0xffff888101401300 (size 168): > comm "syz-executor355", pid 8461, jiffies 4294953658 (age 32.400s) > 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: > [<00000000caa0de2b>] prepare_creds+0x25/0x390 kernel/cred.c:258 > [<000000001821b99d>] copy_creds+0x3a/0x230 kernel/cred.c:358 > [<0000000022c32914>] copy_process+0x661/0x24d0 kernel/fork.c:1971 > [<00000000d3adca2d>] kernel_clone+0xf3/0x670 kernel/fork.c:2456 > [<00000000d11b7286>] __do_sys_clone+0x76/0xa0 kernel/fork.c:2573 > [<000000008280baad>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > [<00000000685d8cf0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > BUG: memory leak > unreferenced object 0xffff88810b0a6f20 (size 32): > comm "syz-executor355", pid 8461, jiffies 4294953658 (age 32.400s) > hex dump (first 32 bytes): > b0 6e 93 00 81 88 ff ff 00 00 00 00 00 00 00 00 .n.............. > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<000000007d750ba1>] kmalloc include/linux/slab.h:557 [inline] > [<000000007d750ba1>] kzalloc include/linux/slab.h:664 [inline] > [<000000007d750ba1>] lsm_cred_alloc security/security.c:533 [inline] > [<000000007d750ba1>] security_prepare_creds+0xa5/0xd0 > security/security.c:1632 > [<00000000ba63fcc7>] prepare_creds+0x277/0x390 kernel/cred.c:285 > [<000000001821b99d>] copy_creds+0x3a/0x230 kernel/cred.c:358 > [<0000000022c32914>] copy_process+0x661/0x24d0 kernel/fork.c:1971 > [<00000000d3adca2d>] kernel_clone+0xf3/0x670 kernel/fork.c:2456 > [<00000000d11b7286>] __do_sys_clone+0x76/0xa0 kernel/fork.c:2573 > [<000000008280baad>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > [<00000000685d8cf0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > BUG: memory leak > unreferenced object 0xffff888101ea2200 (size 256): > comm "syz-executor355", pid 8470, jiffies 4294953658 (age 32.400s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 20 59 03 01 81 88 ff ff 80 87 a8 10 81 88 ff ff Y.............. > backtrace: > [<000000002e0a7c5f>] kmem_cache_zalloc include/linux/slab.h:654 [inline] > [<000000002e0a7c5f>] __alloc_file+0x1f/0x130 fs/file_table.c:101 > [<000000001a55b73a>] alloc_empty_file+0x69/0x120 fs/file_table.c:151 > [<00000000fb22349e>] alloc_file+0x33/0x1b0 fs/file_table.c:193 > [<000000006e1465bb>] alloc_file_pseudo+0xb2/0x140 fs/file_table.c:233 > [<000000007118092a>] anon_inode_getfile fs/anon_inodes.c:91 [inline] > [<000000007118092a>] anon_inode_getfile+0xaa/0x120 fs/anon_inodes.c:74 > [<000000002ae99012>] io_uring_get_fd fs/io_uring.c:9198 [inline] > [<000000002ae99012>] io_uring_create fs/io_uring.c:9377 [inline] > [<000000002ae99012>] io_uring_setup+0x1125/0x1630 fs/io_uring.c:9411 > [<000000008280baad>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > [<00000000685d8cf0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Eric
