Hello:
This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@xxxxxxxxxxxxx>:
On Tue, 29 Aug 2023 22:53:52 +0200 you wrote:
> syzbot reported a data race splat between two processes trying to
> update the same BPF map value via syscall on different CPUs:
>
> BUG: KCSAN: data-race in bpf_percpu_array_update / bpf_percpu_array_update
>
> write to 0xffffe8fffe7425d8 of 8 bytes by task 8257 on cpu 1:
> bpf_long_memcpy include/linux/bpf.h:428 [inline]
> bpf_obj_memcpy include/linux/bpf.h:441 [inline]
> copy_map_value_long include/linux/bpf.h:464 [inline]
> bpf_percpu_array_update+0x3bb/0x500 kernel/bpf/arraymap.c:380
> bpf_map_update_value+0x190/0x370 kernel/bpf/syscall.c:175
> generic_map_update_batch+0x3ae/0x4f0 kernel/bpf/syscall.c:1749
> bpf_map_do_batch+0x2df/0x3d0 kernel/bpf/syscall.c:4648
> __sys_bpf+0x28a/0x780
> __do_sys_bpf kernel/bpf/syscall.c:5241 [inline]
> __se_sys_bpf kernel/bpf/syscall.c:5239 [inline]
> __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5239
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> [...]
Here is the summary with links:
- [bpf] bpf: Annotate bpf_long_memcpy with data_race
https://git.kernel.org/bpf/bpf/c/6a86b5b5cd76
You are awesome, thank you!
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