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[Qemu-devel] [PATCH] -chroot and -su options.
From: |
Rob Landley |
Subject: |
[Qemu-devel] [PATCH] -chroot and -su options. |
Date: |
Mon, 3 Mar 2008 18:28:22 -0600 |
User-agent: |
KMail/1.9.6 (enterprise 0.20070907.709405) |
Quick and dirty patch to teach qemu application emulation how to chroot (and
drop privs), so you don't have to pollute a target filesystem with host code,
and/or figure out how to build qemu static in order to run a dynamic binary.
diff --git a/linux-user/main.c b/linux-user/main.c
index 124b98c..b010fd2 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -1905,6 +1905,10 @@ void usage(void)
"-cpu model select CPU (-cpu ? for list)\n"
"-drop-ld-preload drop LD_PRELOAD for target process\n"
"\n"
+ "Root options:\n"
+ "-chroot dir chroot to dir\n"
+ "-su uid:gid set numeric user and group IDs\n"
+ "\n"
"Debug options:\n"
"-d options activate log (logfile=%s)\n"
"-p pagesize set the host page size to 'pagesize'\n"
@@ -2011,6 +2015,28 @@ int main(int argc, char **argv)
drop_ld_preload = 1;
} else if (!strcmp(r, "strace")) {
do_strace = 1;
+ } else if (!strcmp(r, "chroot")) {
+ if (chdir(argv[optind++]) || chroot(".")) {
+ fprintf(stderr, "Can't chroot to '%s' (are you root?)\n",
+ argv[--optind]);
+ _exit(1);
+ }
+ } else if (!strcmp(r, "su")) {
+ int temp;
+ char *gid = strchr(argv[optind], ':');
+ if (gid) {
+ temp = atoi(++gid);
+ if (setresgid(temp, temp, temp)) {
+ fprintf(stderr, "Can't set gid to %d (are you root?)\n",
+ temp);
+ _exit(1);
+ }
+ }
+ temp = atoi(argv[optind++]);
+ if (setresuid(temp, temp, temp)) {
+ fprintf(stderr, "Can't set uid to %d (are you root?)\n", temp);
+ _exit(1);
+ }
} else
{
usage();
--
"One of my most productive days was throwing away 1000 lines of code."
- Ken Thompson.
- [Qemu-devel] [PATCH] -chroot and -su options.,
Rob Landley <=
Re: [Qemu-devel] [PATCH] -chroot and -su options., Anderson Lizardo, 2008/03/14