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The test does the following:
- Mounts a loopback filesystem and appends the IMA policy to measure
executions only on this file-system. Restricting the IMA policy to
a particular filesystem prevents a system-wide IMA policy change.
- Executes an executable copied to this loopback filesystem.
- Calls the bpf_ima_inode_hash in the bprm_committed_creds hook and
checks if the call succeeded and checks if a hash was calculated.
The test shells out to the added ima_setup.sh script as the setup is
better handled in a shell script and is more complicated to do in the
test program or even shelling out individual commands from C.
The list of required configs (i.e. IMA, SECURITYFS,
IMA_{WRITE,READ}_POLICY) for running this test are also updated.
Suggested-by: Mimi Zohar <zohar@linux.ibm.com> (limit policy rule to loopback mount)
Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20201124151210.1081188-4-kpsingh@chromium.org
28 lines
544 B
C
28 lines
544 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2020 Google LLC.
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*/
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#include "vmlinux.h"
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#include <errno.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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long ima_hash_ret = -1;
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u64 ima_hash = 0;
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u32 monitored_pid = 0;
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char _license[] SEC("license") = "GPL";
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SEC("lsm.s/bprm_committed_creds")
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int BPF_PROG(ima, struct linux_binprm *bprm)
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{
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u32 pid = bpf_get_current_pid_tgid() >> 32;
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if (pid == monitored_pid)
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ima_hash_ret = bpf_ima_inode_hash(bprm->file->f_inode,
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&ima_hash, sizeof(ima_hash));
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return 0;
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}
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