Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 6.1 02/18] bpf: Print a warning only if writing to unprivileged_bpf_disabled. | Date | Sun, 9 Jul 2023 11:14:30 -0400 |
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From: Kui-Feng Lee <thinker.li@gmail.com>
[ Upstream commit fedf99200ab086c42a572fca1d7266b06cdc3e3f ]
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 Signed-off-by: Sasha Levin <sashal@kernel.org> --- kernel/bpf/syscall.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 6c61dba26f4d9..f04e1f1fc4b6b 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5284,7 +5284,8 @@ 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; } -- 2.39.2
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