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unshare on parent Zygote only

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Calling unshare on child Zygotes crash at a sanity check but they end up inheriting the namespace either way.

closes #1
This commit is contained in:
snake-4
2024-03-26 18:26:24 +01:00
parent 72afc9e4fc
commit 58782b21f8
1 changed files with 20 additions and 7 deletions
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27
module/jni/main.cpp
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@@ -56,13 +56,26 @@ public:
{
LOGD("Creating new mount namespace for parent pid=%d uid=%d", getpid(), args->uid);
/*
* Mount the pseudo app mount namespace's root as MS_SLAVE, so every mount/umount from
* Zygote shared pre-specialization mountspace is propagated to this one.
*/
if (mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) == -1)
{
LOGE("mount(\"rootfs\", \"/\", NULL, (MS_SLAVE | MS_REC), NULL) returned -1");
/*
* preAppSpecialize is before ensureInAppMountNamespace.
* postAppSpecialize is after seccomp setup.
* So we unshare here to create a pseudo app mount namespace
*/
if (unshare(CLONE_NEWNS) == -1)
{
LOGE("unshare(CLONE_NEWNS) returned -1: %d (%s)", errno, strerror(errno));
// Don't unmount anything in global namespace
return;
}
/*
* Mount the pseudo app mount namespace's root as MS_SLAVE, so every mount/umount from
* Zygote shared pre-specialization mountspace is propagated to this one.
*/
if (mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) == -1)
{
LOGE("mount(\"rootfs\", \"/\", NULL, (MS_SLAVE | MS_REC), NULL) returned -1");
}
}
do_unmount();