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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162// SPDX-License-Identifier: GPL-2.0/* * binfmt_misc_ops handler for the selftest's fixed-interpreter case: match a * 64-bit aarch64 ELF header from the prefetched buffer and route it to a fixed * interpreter chosen by the program. This is the portable, self-contained * equivalent of routing a foreign binary to an emulator: it matches * programmatically and computes the interpreter, but points at a test binary * the harness installs rather than a system emulator. */#include "vmlinux.h"#include <bpf/bpf_helpers.h>#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
#define EI_CLASS 4#define ELFCLASS64 2#define EM_AARCH64 183
extern int bpf_binprm_set_interp(struct linux_binprm *bprm, const char *path, size_t path__sz) __ksym;
/* * A magic-style decision needs nothing beyond the prefetched bprm->buf, * even though the match program could read the file. */SEC("struct_ops.s/match")bool BPF_PROG(bpf_interp_match, struct linux_binprm *bprm){ __u16 machine;
if (bprm->buf[0] != 0x7f || bprm->buf[1] != 'E' || bprm->buf[2] != 'L' || bprm->buf[3] != 'F' || bprm->buf[EI_CLASS] != ELFCLASS64) return false;
/* e_machine is a 16-bit little-endian field at offset 18. */ machine = (__u8)bprm->buf[18] | ((__u16)(__u8)bprm->buf[19] << 8); return machine == EM_AARCH64;}
SEC("struct_ops.s/load")int BPF_PROG(bpf_interp_load, struct linux_binprm *bprm){ /* * Keep the path on the (writable) stack: bpf_binprm_set_interp() takes * a sized memory arg and the verifier rejects a read-only .rodata * buffer for it. The harness installs the interpreter at this path. */ char interp[] = "/tmp/binfmt_bpf_interp";
/* @path__sz includes the terminating NUL; 0 commits the selection. */ return bpf_binprm_set_interp(bprm, interp, sizeof(interp));}
SEC(".struct_ops.link")struct binfmt_misc_ops bpf_interp = { .match = (void *)bpf_interp_match, .load = (void *)bpf_interp_load, .name = "bpf_interp",};