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modules: check arch and block load on mismatch 

Add module_allow_arch() to set the target architecture.
In case a module is limited to some arch verify arches
match and ignore the module if not.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jose R. Ziviani <jziviani@suse.de>
Message-Id: <20210624103836.2382472-19-kraxel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-06-24 12:38:20 +02:00 committed by Paolo Bonzini
parent 819b8b13c1
commit d7795d3cc5
3 changed files with 33 additions and 0 deletions
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1
include/qemu/module.h
View File

@ -72,6 +72,7 @@ void module_call_init(module_init_type type);
bool module_load_one(const char *prefix, const char *lib_name, bool mayfail);
void module_load_qom_one(const char *type);
void module_load_qom_all(void);
void module_allow_arch(const char *arch);
/**
* DOC: module info annotation macros

3
softmmu/vl.c
View File

@ -126,6 +126,8 @@
#include "sysemu/iothread.h"
#include "qemu/guest-random.h"
#include "config-host.h"
#define MAX_VIRTIO_CONSOLES 1
typedef struct BlockdevOptionsQueueEntry {
@ -2740,6 +2742,7 @@ void qemu_init(int argc, char **argv, char **envp)
#ifdef CONFIG_MODULES
module_init_info(qemu_modinfo);
module_allow_arch(TARGET_NAME);
#endif
qemu_init_subsystems();

29
util/module.c
View File

@ -117,12 +117,33 @@ static const QemuModinfo module_info_stub[] = { {
/* end of list */
} };
static const QemuModinfo *module_info = module_info_stub;
static const char *module_arch;
void module_init_info(const QemuModinfo *info)
{
module_info = info;
}
void module_allow_arch(const char *arch)
{
module_arch = arch;
}
static bool module_check_arch(const QemuModinfo *modinfo)
{
if (modinfo->arch) {
if (!module_arch) {
/* no arch set -> ignore all */
return false;
}
if (strcmp(module_arch, modinfo->arch) != 0) {
/* mismatch */
return false;
}
}
return true;
}
static int module_load_file(const char *fname, bool mayfail, bool export_symbols)
{
GModule *g_module;
@ -224,6 +245,13 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
g_hash_table_add(loaded_modules, module_name);
for (modinfo = module_info; modinfo->name != NULL; modinfo++) {
if (modinfo->arch) {
if (strcmp(modinfo->name, module_name) == 0) {
if (!module_check_arch(modinfo)) {
return false;
}
}
}
if (modinfo->deps) {
if (strcmp(modinfo->name, module_name) == 0) {
/* we depend on other module(s) */
@ -345,6 +373,7 @@ void qemu_load_module_for_opts(const char *group)
#else
void module_allow_arch(const char *arch) {}
void qemu_load_module_for_opts(const char *group) {}
void module_load_qom_one(const char *type) {}
void module_load_qom_all(void) {}