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Message-Id: <20210920163934.874877269@linuxfoundation.org>
Date: Mon, 20 Sep 2021 18:42:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Juhee Kang <claudiajkang@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Yonghong Song <yhs@...com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 110/260] samples: bpf: Fix tracex7 error raised on the missing argument
From: Juhee Kang <claudiajkang@...il.com>
[ Upstream commit 7d07006f05922b95518be403f08ef8437b67aa32 ]
The current behavior of 'tracex7' doesn't consist with other bpf samples
tracex{1..6}. Other samples do not require any argument to run with, but
tracex7 should be run with btrfs device argument. (it should be executed
with test_override_return.sh)
Currently, tracex7 doesn't have any description about how to run this
program and raises an unexpected error. And this result might be
confusing since users might not have a hunch about how to run this
program.
// Current behavior
# ./tracex7
sh: 1: Syntax error: word unexpected (expecting ")")
// Fixed behavior
# ./tracex7
ERROR: Run with the btrfs device argument!
In order to fix this error, this commit adds logic to report a message
and exit when running this program with a missing argument.
Additionally in test_override_return.sh, there is a problem with
multiple directory(tmpmnt) creation. So in this commit adds a line with
removing the directory with every execution.
Signed-off-by: Juhee Kang <claudiajkang@...il.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Acked-by: Yonghong Song <yhs@...com>
Link: https://lore.kernel.org/bpf/20210727041056.23455-1-claudiajkang@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
samples/bpf/test_override_return.sh | 1 +
samples/bpf/tracex7_user.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/samples/bpf/test_override_return.sh b/samples/bpf/test_override_return.sh
index e68b9ee6814b..35db26f736b9 100755
--- a/samples/bpf/test_override_return.sh
+++ b/samples/bpf/test_override_return.sh
@@ -1,5 +1,6 @@
#!/bin/bash
+rm -r tmpmnt
rm -f testfile.img
dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1
DEVICE=$(losetup --show -f testfile.img)
diff --git a/samples/bpf/tracex7_user.c b/samples/bpf/tracex7_user.c
index ea6dae78f0df..2ed13e9f3fcb 100644
--- a/samples/bpf/tracex7_user.c
+++ b/samples/bpf/tracex7_user.c
@@ -13,6 +13,11 @@ int main(int argc, char **argv)
char command[256];
int ret;
+ if (!argv[1]) {
+ fprintf(stderr, "ERROR: Run with the btrfs device argument!\n");
+ return 0;
+ }
+
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
if (load_bpf_file(filename)) {
--
2.30.2
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