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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /samples/bpf/test_overhead_kprobe_kern.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'samples/bpf/test_overhead_kprobe_kern.c')
-rw-r--r--samples/bpf/test_overhead_kprobe_kern.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/samples/bpf/test_overhead_kprobe_kern.c b/samples/bpf/test_overhead_kprobe_kern.c
new file mode 100644
index 000000000..8fdd2c9c5
--- /dev/null
+++ b/samples/bpf/test_overhead_kprobe_kern.c
@@ -0,0 +1,49 @@
+/* Copyright (c) 2016 Facebook
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#include <linux/version.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <uapi/linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define _(P) \
+ ({ \
+ typeof(P) val = 0; \
+ bpf_probe_read_kernel(&val, sizeof(val), &(P)); \
+ val; \
+ })
+
+SEC("kprobe/__set_task_comm")
+int prog(struct pt_regs *ctx)
+{
+ struct signal_struct *signal;
+ struct task_struct *tsk;
+ char oldcomm[TASK_COMM_LEN] = {};
+ char newcomm[TASK_COMM_LEN] = {};
+ u16 oom_score_adj;
+ u32 pid;
+
+ tsk = (void *)PT_REGS_PARM1(ctx);
+
+ pid = _(tsk->pid);
+ bpf_probe_read_kernel_str(oldcomm, sizeof(oldcomm), &tsk->comm);
+ bpf_probe_read_kernel_str(newcomm, sizeof(newcomm),
+ (void *)PT_REGS_PARM2(ctx));
+ signal = _(tsk->signal);
+ oom_score_adj = _(signal->oom_score_adj);
+ return 0;
+}
+
+SEC("kprobe/urandom_read")
+int prog2(struct pt_regs *ctx)
+{
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = LINUX_VERSION_CODE;