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934d9746ed
We do not actually test the bpf_override_return helper functionality itself at the moment, only the bpf program being able to attach it. Adding test that override prctl syscall return value on top of kprobe and kprobe.multi. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/bpf/20260112121157.854473-2-jolsa@kernel.org
29 lines
505 B
C
29 lines
505 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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int pid = 0;
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SEC("kprobe.multi")
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int test_override(struct pt_regs *ctx)
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{
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if (bpf_get_current_pid_tgid() >> 32 != pid)
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return 0;
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bpf_override_return(ctx, 123);
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return 0;
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}
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SEC("kprobe")
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int test_kprobe_override(struct pt_regs *ctx)
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{
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if (bpf_get_current_pid_tgid() >> 32 != pid)
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return 0;
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bpf_override_return(ctx, 123);
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return 0;
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}
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