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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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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677// SPDX-License-Identifier: GPL-2.0/* * binfmt_misc_ops handler for the selftest's bound-interpreter case: one * handler, one entry, an interpreter per guest architecture - each bound to * a file when the entry was registered rather than to a path resolved at * exec time. The load program names the one it wants; a name the entry did * not bind fails the exec, which the harness checks too. */#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 E_MACHINE_OFF 18#define EM_ARM 40#define EM_AARCH64 183#define EM_RISCV 243
extern int bpf_binprm_select_interp(struct linux_binprm *bprm, const char *name, size_t name__sz) __ksym;
/* The guest architecture of a 64-bit ELF, or zero if it is not one. */static __u16 elf_machine(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 0;
/* Little-endian 16-bit field, read byte-wise for the verifier. */ return (__u8)bprm->buf[E_MACHINE_OFF] | ((__u16)(__u8)bprm->buf[E_MACHINE_OFF + 1] << 8);}
SEC("struct_ops.s/match")bool BPF_PROG(interp_bind_match, struct linux_binprm *bprm){ __u16 machine = elf_machine(bprm);
return machine == EM_AARCH64 || machine == EM_RISCV || machine == EM_ARM;}
SEC("struct_ops.s/load")int BPF_PROG(interp_bind_load, struct linux_binprm *bprm){ /* * Names, not paths: each one selects a file the entry pre-opened, so * nothing is resolved here or later, in any namespace. The buffers * are on the stack because the verifier rejects .rodata for a sized * memory argument. */ char first[] = "first"; char second[] = "second"; char unbound[] = "unbound";
switch (elf_machine(bprm)) { case EM_AARCH64: return bpf_binprm_select_interp(bprm, first, sizeof(first)); case EM_RISCV: return bpf_binprm_select_interp(bprm, second, sizeof(second)); }
/* The entry bound nothing under this name: -ENOENT fails the exec. */ return bpf_binprm_select_interp(bprm, unbound, sizeof(unbound));}
SEC(".struct_ops.link")struct binfmt_misc_ops interp_bind = { .match = (void *)interp_bind_match, .load = (void *)interp_bind_load, .name = "interp_bind",};