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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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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758// SPDX-License-Identifier: GPL-2.0/* * binfmt_misc_ops handler for the transparent-mode case: match a synthetic * riscv ELF header and run the asserting interpreter transparently - the * argument vector untouched, the binary in AT_EXECFD and mm->exe_file * labeled with the binary. */#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_RISCV 243
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(transparent_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_RISCV;}
SEC("struct_ops.s/load")int BPF_PROG(transparent_load, struct linux_binprm *bprm){ char interp[] = "/tmp/binfmt_transparent_interp"; int err;
err = bpf_binprm_set_flags(bprm, BPF_BINPRM_TRANSPARENT); 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 transparent = { .match = (void *)transparent_match, .load = (void *)transparent_load, .name = "transparent",};