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965de87e54
This adds a basic test for bpf_override_return to verify it works. We override the main function for mounting a btrfs fs so it'll return -ENOMEM and then make sure that trying to mount a btrfs fs will fail. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
16 lines
335 B
C
16 lines
335 B
C
#include <uapi/linux/ptrace.h>
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#include <uapi/linux/bpf.h>
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#include <linux/version.h>
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#include "bpf_helpers.h"
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SEC("kprobe/open_ctree")
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int bpf_prog1(struct pt_regs *ctx)
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{
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unsigned long rc = -12;
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bpf_override_return(ctx, rc);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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