9f7fa22589
Add bpf_testmod module, which is conceptually out-of-tree module and provides ways for selftests/bpf to test various kernel module-related functionality: raw tracepoint, fentry/fexit/fmod_ret, etc. This module will be auto-loaded by test_progs test runner and expected by some of selftests to be present and loaded. Pahole currently isn't able to generate BTF for static functions in kernel modules, so make sure traced function is global. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20201203204634.1325171-7-andrii@kernel.org
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <linux/error-injection.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/sysfs.h>
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#include <linux/tracepoint.h>
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#include "bpf_testmod.h"
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#define CREATE_TRACE_POINTS
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#include "bpf_testmod-events.h"
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noinline ssize_t
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bpf_testmod_test_read(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t len)
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{
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struct bpf_testmod_test_read_ctx ctx = {
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.buf = buf,
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.off = off,
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.len = len,
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};
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trace_bpf_testmod_test_read(current, &ctx);
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return -EIO; /* always fail */
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}
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EXPORT_SYMBOL(bpf_testmod_test_read);
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ALLOW_ERROR_INJECTION(bpf_testmod_test_read, ERRNO);
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static struct bin_attribute bin_attr_bpf_testmod_file __ro_after_init = {
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.attr = { .name = "bpf_testmod", .mode = 0444, },
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.read = bpf_testmod_test_read,
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};
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static int bpf_testmod_init(void)
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{
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return sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
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}
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static void bpf_testmod_exit(void)
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{
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return sysfs_remove_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
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}
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module_init(bpf_testmod_init);
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module_exit(bpf_testmod_exit);
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MODULE_AUTHOR("Andrii Nakryiko");
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MODULE_DESCRIPTION("BPF selftests module");
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MODULE_LICENSE("Dual BSD/GPL");
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