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kernel: support the case that init_task.mnt_ns != zygote.mnt_ns(WSA) (#698)

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Basic support for the case that init_task.mnt_ns != zygote.mnt_ns(WSA),
just copy nsproxy and fs pointers for solve #276.

Note the copy in `apk_sign.c` is not required but suggested for
secure(ensure the checked mnt_ns is what ns android running, not created
by user, although many distributions does not have user ns.).

Tested with latest release on Win10 19045.3086(with WSAPatch).

Further review required for:
- [x] Security of this operation (without locking).
- [x] The impact of these modifications on other Android distributions.
This commit is contained in:
4qwerty7
2023-07-02 00:20:01 +08:00
committed by GitHub
parent 6ef5e4ef76
commit c0066b68f5
6 changed files with 96 additions and 38 deletions
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3
kernel/uid_observer.c
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@@ -39,8 +39,7 @@ static bool is_uid_exist(uid_t uid, void *data)
static void do_update_uid(struct work_struct *work)
{
KWORKER_INSTALL_KEYRING();
struct file *fp = filp_open(SYSTEM_PACKAGES_LIST_PATH, O_RDONLY, 0);
struct file *fp = ksu_filp_open_compat(SYSTEM_PACKAGES_LIST_PATH, O_RDONLY, 0);
if (IS_ERR(fp)) {
pr_err("do_update_uid, open " SYSTEM_PACKAGES_LIST_PATH
" failed: %d\n",