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Revert "Unmount isolated process which forks from zygote unconditionally (#2747)"

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This reverts commit 695e749e3e.
This commit is contained in:
ShirkNeko
2025-09-25 16:13:07 +08:00
parent 0af1ab2845
commit 23ed4384e6
1 changed files with 9 additions and 20 deletions
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29
kernel/core_hook.c
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@@ -66,7 +66,7 @@ static inline bool is_allow_su()
return ksu_is_allow_uid(current_uid().val);
}
static inline bool is_unsupported_app_uid(uid_t uid)
static inline bool is_unsupported_uid(uid_t uid)
{
#define LAST_APPLICATION_UID 19999
uid_t appid = uid % 100000;
@@ -628,13 +628,14 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
return 0;
}
static bool is_non_appuid(kuid_t uid)
static bool is_appuid(kuid_t uid)
{
#define PER_USER_RANGE 100000
#define FIRST_APPLICATION_UID 10000
#define LAST_APPLICATION_UID 19999
uid_t appid = uid.val % PER_USER_RANGE;
return appid < FIRST_APPLICATION_UID;
return appid >= FIRST_APPLICATION_UID && appid <= LAST_APPLICATION_UID;
}
static bool should_umount(struct path *path)
@@ -706,25 +707,13 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
return 0;
}
if (is_non_appuid(new_uid)) {
#ifdef CONFIG_KSU_DEBUG
pr_info("handle setuid ignore non application uid: %d\n", new_uid.val);
#endif
if (!is_appuid(new_uid) || is_unsupported_uid(new_uid.val)) {
// pr_info("handle setuid ignore non application or isolated uid: %d\n", new_uid.val);
return 0;
}
// isolated process may be directly forked from zygote, always unmount
if (is_unsupported_app_uid(new_uid.val)) {
#ifdef CONFIG_KSU_DEBUG
pr_info("handle umount for unsupported application uid: %d\n", new_uid.val);
#endif
goto do_umount;
}
if (ksu_is_allow_uid(new_uid.val)) {
#ifdef CONFIG_KSU_DEBUG
pr_info("handle setuid ignore allowed application: %d\n", new_uid.val);
#endif
// pr_info("handle setuid ignore allowed application: %d\n", new_uid.val);
return 0;
}
@@ -736,11 +725,11 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
#endif
}
do_umount:
// check old process's selinux context, if it is not zygote, ignore it!
// because some su apps may setuid to untrusted_app but they are in global mount namespace
// when we umount for such process, that is a disaster!
if (!is_zygote(old->security)) {
bool is_zygote_child = is_zygote(old->security);
if (!is_zygote_child) {
pr_info("handle umount ignore non zygote child: %d\n",
current->pid);
return 0;