Commit fedf9920 authored by Kui-Feng Lee's avatar Kui-Feng Lee Committed by Andrii Nakryiko
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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: default avatarKui-Feng Lee <kuifeng@meta.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20230502181418.308479-1-kuifeng@meta.com
parent bf6882ae

kernel/bpf/syscall.c

+2 −1
Original line number Diff line number Diff line
@@ -5380,6 +5380,7 @@ static int bpf_unpriv_handler(struct ctl_table *table, int write, 
		*(int *)table->data = unpriv_enable;

	}



	if (write)

		unpriv_ebpf_notify(unpriv_enable);



	return ret;