Hi All, We had been running syzkaller on v5.10.y and a "memory leak in do_seccomp" was being reported on it. I got some time to check that today and have managed to get a syzkaller reproducer. I dont have a C reproducer which I can share but I can use the syz-reproducer to reproduce this with next-20210730. The old report on v5.10.y is at https://elisa-builder-00.iol.unh.edu/syzkaller/report?id=f6ddd3b592f00e95f9cbd2e74f70a5b04b015c6f BUG: memory leak unreferenced object 0xffff888019282c00 (size 512): comm "syz-executor.1", pid 7389, jiffies 4294761829 (age 17.841s) hex dump (first 32 bytes): 01 00 00 00 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 ................ backtrace: [<00000000762c0963>] do_seccomp+0x2d5/0x27d0 [<0000000006e512d1>] do_syscall_64+0x3b/0x90 [<0000000094ae9ff8>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffffc900006b5000 (size 4096): comm "syz-executor.1", pid 7389, jiffies 4294761829 (age 17.841s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 05 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000854901e5>] __vmalloc_node_range+0x550/0x9a0 [<000000002686628f>] __vmalloc_node+0xb5/0x100 [<0000000004cbd298>] bpf_prog_alloc_no_stats+0x38/0x350 [<0000000009149728>] bpf_prog_alloc+0x24/0x170 [<000000000fe7f1e7>] bpf_prog_create_from_user+0xad/0x2e0 [<000000000c70eb02>] do_seccomp+0x325/0x27d0 [<0000000006e512d1>] do_syscall_64+0x3b/0x90 [<0000000094ae9ff8>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff888026eb1000 (size 2048): comm "syz-executor.1", pid 7389, jiffies 4294761829 (age 17.842s) hex dump (first 32 bytes): 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 00 ................ backtrace: [<0000000072de7240>] bpf_prog_alloc_no_stats+0xeb/0x350 [<0000000009149728>] bpf_prog_alloc+0x24/0x170 [<000000000fe7f1e7>] bpf_prog_create_from_user+0xad/0x2e0 [<000000000c70eb02>] do_seccomp+0x325/0x27d0 [<0000000006e512d1>] do_syscall_64+0x3b/0x90 [<0000000094ae9ff8>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff888014dddac0 (size 16): comm "syz-executor.1", pid 7389, jiffies 4294761829 (age 17.842s) hex dump (first 16 bytes): 01 00 ca 08 80 88 ff ff c8 ef df 14 80 88 ff ff ................ backtrace: [<00000000c5d4ed93>] bpf_prog_store_orig_filter+0x7b/0x1e0 [<000000007cb21c2a>] bpf_prog_create_from_user+0x1c6/0x2e0 [<000000000c70eb02>] do_seccomp+0x325/0x27d0 [<0000000006e512d1>] do_syscall_64+0x3b/0x90 [<0000000094ae9ff8>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff888014dfefc8 (size 8): comm "syz-executor.1", pid 7389, jiffies 4294761829 (age 17.842s) hex dump (first 8 bytes): 06 00 00 00 ff ff ff 7f ........ backtrace: [<00000000ee5550f8>] kmemdup+0x23/0x50 [<00000000f1acd067>] bpf_prog_store_orig_filter+0x103/0x1e0 [<000000007cb21c2a>] bpf_prog_create_from_user+0x1c6/0x2e0 [<000000000c70eb02>] do_seccomp+0x325/0x27d0 [<0000000006e512d1>] do_syscall_64+0x3b/0x90 [<0000000094ae9ff8>] entry_SYSCALL_64_after_hwframe+0x44/0xae Not sure if this has been already reported or not, but I will be happy to test if you have a fix for this. -- Regards Sudip
