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| author | Kui-Feng Lee <thinker.li@gmail.com> | 2023-05-02 20:14:18 +0200 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2023-05-03 01:20:31 +0200 |
| commit | fedf99200ab086c42a572fca1d7266b06cdc3e3f (patch) | |
| tree | e88d5e59b04d90a7f3bc739305c82f619b023897 /kernel/bpf/syscall.c | |
| parent | bpf: Emit struct bpf_tcp_sock type in vmlinux BTF (diff) | |
| download | linux-fedf99200ab086c42a572fca1d7266b06cdc3e3f.tar.xz linux-fedf99200ab086c42a572fca1d7266b06cdc3e3f.zip | |
bpf: Print a warning only if writing to unprivileged_bpf_disabled.
Only print the warning message if you are writing to
"/proc/sys/kernel/unprivileged_bpf_disabled".
The kernel may print an annoying warning when you read
"/proc/sys/kernel/unprivileged_bpf_disabled" saying
WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible
via Spectre v2 BHB attacks!
However, this message is only meaningful when the feature is
disabled or enabled.
Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20230502181418.308479-1-kuifeng@meta.com
Diffstat (limited to '')
| -rw-r--r-- | kernel/bpf/syscall.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 14f39c1e573e..909c112ef537 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5380,7 +5380,8 @@ static int bpf_unpriv_handler(struct ctl_table *table, int write, *(int *)table->data = unpriv_enable; } - unpriv_ebpf_notify(unpriv_enable); + if (write) + unpriv_ebpf_notify(unpriv_enable); return ret; } |