linux-kernel - [PATCH AUTOSEL 6.1 02/18] bpf: Print a warning only if writing to unprivileged_bpf

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Message-Id: <20230709151446.513549-2-sashal@kernel.org>
Date:   Sun,  9 Jul 2023 11:14:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kui-Feng Lee <thinker.li@...il.com>,
        Kui-Feng Lee <kuifeng@...a.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, Sasha Levin <sashal@...nel.org>,
        ast@...nel.org, daniel@...earbox.net, bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 02/18] bpf: Print a warning only if writing to unprivileged_bpf_disabled.

From: Kui-Feng Lee <thinker.li@...il.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@...a.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Acked-by: Yonghong Song <yhs@...com>
Link: https://lore.kernel.org/bpf/20230502181418.308479-1-kuifeng@meta.com
Signed-off-by: Sasha Levin <sashal@...nel.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