QingdaoU/Judger
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Merge branch 'master' of https://git.coding.net/virusdefender/judger

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* 'master' of https://git.coding.net/virusdefender/judger:
  add whitelist
This commit is contained in:
virusdefender 2016-01-13 11:57:08 +08:00
commit 495a58b129
1 changed files with 7 additions and 3 deletions
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10
libexecwhitelist.c
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@ -29,7 +29,9 @@
#include <unistd.h> // readlink
#include <seccomp.h>
#include <stdio.h>
int syscalls_whitelist[] = {SCMP_SYS(read), SCMP_SYS(write), SCMP_SYS(open), SCMP_SYS(close),
SCMP_SYS(fstat), SCMP_SYS(mmap), SCMP_SYS(mprotect), SCMP_SYS(munmap),
SCMP_SYS(brk), SCMP_SYS(access), SCMP_SYS(exit_group), SCMP_SYS(arch_prctl)};
typedef int (*main_t)(int, char **, char **);
#ifndef __unbounded
@ -48,6 +50,7 @@ int __libc_start_main(main_t main, int argc,
int i;
ssize_t len;
void *libc;
int whitelist_length = sizeof(syscalls_whitelist) / sizeof(int);
scmp_filter_ctx ctx = NULL;
int (*libc_start_main)(main_t main,
int,
@ -65,9 +68,10 @@ int __libc_start_main(main_t main, int argc,
libc_start_main = dlsym(libc, "__libc_start_main");
if (!libc_start_main) exit(-2);
ctx = seccomp_init(SCMP_ACT_ALLOW);
ctx = seccomp_init(SCMP_ACT_KILL);
if (!ctx) goto out;
if (seccomp_rule_add(ctx, SCMP_ACT_KILL, SCMP_SYS(clone), 0)) goto out;
for(i = 0; i < whitelist_length; i++)
if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscalls_whitelist[i], 0)) goto out;
if (seccomp_load(ctx)) goto out;
out:
if (ctx) seccomp_release(ctx);