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0e14189459
Add testcases to test bpf_send_signal_task(). In these new test cases, the main process triggers the BPF program and the forked process receives the signals. The target process's signal handler receives a cookie from the bpf program. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20241016084136.10305-3-puranjay@kernel.org
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <vmlinux.h>
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#include <linux/version.h>
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#include <bpf/bpf_helpers.h>
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struct task_struct *bpf_task_from_pid(int pid) __ksym;
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void bpf_task_release(struct task_struct *p) __ksym;
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int bpf_send_signal_task(struct task_struct *task, int sig, enum pid_type type, u64 value) __ksym;
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__u32 sig = 0, pid = 0, status = 0, signal_thread = 0, target_pid = 0;
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static __always_inline int bpf_send_signal_test(void *ctx)
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{
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struct task_struct *target_task = NULL;
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int ret;
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u64 value;
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if (status != 0 || pid == 0)
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return 0;
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if ((bpf_get_current_pid_tgid() >> 32) == pid) {
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if (target_pid) {
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target_task = bpf_task_from_pid(target_pid);
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if (!target_task)
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return 0;
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value = 8;
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}
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if (signal_thread) {
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if (target_pid)
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ret = bpf_send_signal_task(target_task, sig, PIDTYPE_PID, value);
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else
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ret = bpf_send_signal_thread(sig);
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} else {
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if (target_pid)
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ret = bpf_send_signal_task(target_task, sig, PIDTYPE_TGID, value);
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else
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ret = bpf_send_signal(sig);
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}
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if (ret == 0)
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status = 1;
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}
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if (target_task)
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bpf_task_release(target_task);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_enter_nanosleep")
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int send_signal_tp(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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SEC("tracepoint/sched/sched_switch")
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int send_signal_tp_sched(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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SEC("perf_event")
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int send_signal_perf(void *ctx)
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{
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return bpf_send_signal_test(ctx);
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}
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char __license[] SEC("license") = "GPL";
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