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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657// SPDX-License-Identifier: GPL-2.0/* * binfmt_misc_ops handler for the loader-substitution case: match the * marker the harness poked into the payload's e_ident padding and ask for * the selected interpreter to be substituted for the binary's PT_INTERP, * so the binary itself runs as a fully native exec. */#include "vmlinux.h"#include <bpf/bpf_helpers.h>#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
#define EI_CLASS 4#define EI_PAD 9#define ELFCLASS64 2
extern int bpf_binprm_set_interp(struct linux_binprm *bprm, const char *path, size_t path__sz) __ksym;extern int bpf_binprm_set_flags(struct linux_binprm *bprm, enum bpf_binprm_flags flags) __ksym;
SEC("struct_ops.s/match")bool BPF_PROG(loader_match, struct linux_binprm *bprm){ if (bprm->buf[0] != 0x7f || bprm->buf[1] != 'E' || bprm->buf[2] != 'L' || bprm->buf[3] != 'F' || bprm->buf[EI_CLASS] != ELFCLASS64) return false;
/* The harness marks the payload with "LDRTST" at EI_PAD. */ return bprm->buf[EI_PAD + 0] == 'L' && bprm->buf[EI_PAD + 1] == 'D' && bprm->buf[EI_PAD + 2] == 'R' && bprm->buf[EI_PAD + 3] == 'T' && bprm->buf[EI_PAD + 4] == 'S' && bprm->buf[EI_PAD + 5] == 'T';}
SEC("struct_ops.s/load")int BPF_PROG(loader_load, struct linux_binprm *bprm){ char interp[] = "/tmp/binfmt_loader_interp"; int err;
err = bpf_binprm_set_flags(bprm, BPF_BINPRM_LOADER); if (err) return err;
/* @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 loader = { .match = (void *)loader_match, .load = (void *)loader_load, .name = "loader",};