https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fdf0eaf11452d72945af31804e2a1048ee1b574c authored by Linus Torvalds on 16 July 2023, 22:10:37 UTC
Linux 6.5-rc2
Linux 6.5-rc2
Tip revision: fdf0eaf
dropper.c
// SPDX-License-Identifier: GPL-2.0
/*
* Naive system call dropper built on seccomp_filter.
*
* Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
* Author: Will Drewry <wad@chromium.org>
*
* The code may be used by anyone for any purpose,
* and can serve as a starting point for developing
* applications using prctl(PR_SET_SECCOMP, 2, ...).
*
* When run, returns the specified errno for the specified
* system call number against the given architecture.
*
*/
#include <errno.h>
#include <linux/audit.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
#include <linux/unistd.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <unistd.h>
static int install_filter(int arch, int nr, int error)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
(offsetof(struct seccomp_data, arch))),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, arch, 0, 3),
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
(offsetof(struct seccomp_data, nr))),
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, nr, 0, 1),
BPF_STMT(BPF_RET+BPF_K,
SECCOMP_RET_ERRNO|(error & SECCOMP_RET_DATA)),
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
};
struct sock_fprog prog = {
.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
.filter = filter,
};
if (error == -1) {
struct sock_filter kill = BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL);
filter[4] = kill;
}
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
perror("prctl(NO_NEW_PRIVS)");
return 1;
}
if (prctl(PR_SET_SECCOMP, 2, &prog)) {
perror("prctl(PR_SET_SECCOMP)");
return 1;
}
return 0;
}
int main(int argc, char **argv)
{
if (argc < 5) {
fprintf(stderr, "Usage:\n"
"dropper <arch> <syscall_nr> <errno> <prog> [<args>]\n"
"Hint: AUDIT_ARCH_I386: 0x%X\n"
" AUDIT_ARCH_X86_64: 0x%X\n"
" errno == -1 means SECCOMP_RET_KILL\n"
"\n", AUDIT_ARCH_I386, AUDIT_ARCH_X86_64);
return 1;
}
if (install_filter(strtol(argv[1], NULL, 0), strtol(argv[2], NULL, 0),
strtol(argv[3], NULL, 0)))
return 1;
execv(argv[4], &argv[4]);
printf("Failed to execv\n");
return 255;
}