linux-kernel - [PATCH linu-next] samples/bpf: use absolute path for dd

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Date:   Thu, 22 Sep 2022 09:02:31 +0000
From:   cgel.zte@...il.com
To:     ast@...nel.org
Cc:     daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xu Panda <xu.panda@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH linu-next] samples/bpf: use absolute path for dd

From: Xu Panda <xu.panda@....com.cn>

Not using absolute path when invoking dd can lead to serious security
issues.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Xu Panda <xu.panda@....com.cn>
---
 samples/bpf/trace_event_user.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c
index 9664749bf618..d841918accc9 100644
--- a/samples/bpf/trace_event_user.c
+++ b/samples/bpf/trace_event_user.c
@@ -126,7 +126,7 @@ static void print_stacks(void)

 static inline int generate_load(void)
 {
-       if (system("dd if=/dev/zero of=/dev/null count=5000k status=none") < 0) {
+       if (system("/usr/bin/dd if=/dev/zero of=/dev/null count=5000k status=none") < 0) {
                printf("failed to generate some load with dd: %s\n", strerror(errno));
                return -1;
        }
-- 
2.15.2