From: Gautam Menghani <gautammenghani201@gmail.com>
To: keescook@chromium.org, shuah@kernel.org, brauner@kernel.org,
paul.walmsley@sifive.com, palmer@dabbelt.com,
aou@eecs.berkeley.edu, guoren@kernel.org
Cc: Gautam Menghani <gautammenghani201@gmail.com>,
luto@amacapital.net, wad@chromium.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org, bpf@vger.kernel.org,
linux-csky@vger.kernel.org,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: [PATCH] selftests/seccomp: Check CAP_SYS_ADMIN capability in the test mode_filter_without_nnp
Date: Sun, 31 Jul 2022 14:55:29 +0530 [thread overview]
Message-ID: <20220731092529.28760-1-gautammenghani201@gmail.com> (raw)
In the "mode_filter_without_nnp" test in seccomp_bpf, there is currently
a TODO which asks to check the capability CAP_SYS_ADMIN instead of euid.
This patch adds support to check if the calling process has the flag
CAP_SYS_ADMIN, and also if this flag has CAP_EFFECTIVE set.
Signed-off-by: Gautam Menghani <gautammenghani201@gmail.com>
---
tools/testing/selftests/seccomp/seccomp_bpf.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 136df5b76319..16b0edc520ef 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -392,6 +392,8 @@ TEST(mode_filter_without_nnp)
.filter = filter,
};
long ret;
+ cap_t cap = cap_get_proc();
+ cap_flag_value_t is_cap_sys_admin = 0;
ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
ASSERT_LE(0, ret) {
@@ -400,8 +402,8 @@ TEST(mode_filter_without_nnp)
errno = 0;
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
/* Succeeds with CAP_SYS_ADMIN, fails without */
- /* TODO(wad) check caps not euid */
- if (geteuid()) {
+ cap_get_flag(cap, CAP_SYS_ADMIN, CAP_EFFECTIVE, &is_cap_sys_admin);
+ if (!is_cap_sys_admin) {
EXPECT_EQ(-1, ret);
EXPECT_EQ(EACCES, errno);
} else {
--
2.34.1
next reply other threads:[~2022-07-31 9:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-31 9:25 Gautam Menghani [this message]
2022-08-22 8:49 ` [PATCH] selftests/seccomp: Check CAP_SYS_ADMIN capability in the test mode_filter_without_nnp Gautam Menghani
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