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seccomp: add elevateprivileges argument to command line

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This patch introduces the new argument
[,elevateprivileges=allow|deny|children] to the `-sandbox on'. It allows
or denies Qemu process to elevate its privileges by blacklisting all
set*uid|gid system calls. The 'children' option will let forks and
execves run unprivileged.

Signed-off-by: Eduardo Otubo <otubo@redhat.com>
This commit is contained in:
Eduardo Otubo 2017-03-13 22:13:27 +01:00
parent 2b716fa6d6
commit 73a1e64725
4 changed files with 48 additions and 3 deletions
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27
vl.c
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@ -29,6 +29,7 @@
#ifdef CONFIG_SECCOMP
#include "sysemu/seccomp.h"
#include "sys/prctl.h"
#endif
#if defined(CONFIG_VDE)
@ -275,6 +276,10 @@ static QemuOptsList qemu_sandbox_opts = {
.name = "obsolete",
.type = QEMU_OPT_STRING,
},
{
.name = "elevateprivileges",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
@ -1056,6 +1061,28 @@ static int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp)
}
}
value = qemu_opt_get(opts, "elevateprivileges");
if (value) {
if (g_str_equal(value, "deny")) {
seccomp_opts |= QEMU_SECCOMP_SET_PRIVILEGED;
} else if (g_str_equal(value, "children")) {
seccomp_opts |= QEMU_SECCOMP_SET_PRIVILEGED;
/* calling prctl directly because we're
* not sure if host has CAP_SYS_ADMIN set*/
if (prctl(PR_SET_NO_NEW_PRIVS, 1)) {
error_report("failed to set no_new_privs "
"aborting");
return -1;
}
} else if (g_str_equal(value, "allow")) {
/* default value */
} else {
error_report("invalid argument for elevateprivileges");
return -1;
}
}
if (seccomp_start(seccomp_opts) < 0) {
error_report("failed to install seccomp syscall filter "
"in the kernel");