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kernel: ignore path that's not mountpoint

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weishu
2023-10-12 14:24:41 +08:00
parent 8828939994
commit 79951f06ed
1 changed files with 9 additions and 2 deletions
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11
kernel/core_hook.c
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@@ -233,7 +233,8 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
// someone wants to be root manager, just check it! // someone wants to be root manager, just check it!
// arg3 should be `/data/user/<userId>/<manager_package_name>` // arg3 should be `/data/user/<userId>/<manager_package_name>`
char param[128]; char param[128];
if (ksu_strncpy_from_user_nofault(param, arg3, sizeof(param)) == -EFAULT) { if (ksu_strncpy_from_user_nofault(param, arg3, sizeof(param)) ==
-EFAULT) {
#ifdef CONFIG_KSU_DEBUG #ifdef CONFIG_KSU_DEBUG
pr_err("become_manager: copy param err\n"); pr_err("become_manager: copy param err\n");
#endif #endif
@@ -483,7 +484,8 @@ static bool should_umount(struct path *path)
return false; return false;
} }
static void ksu_umount_mnt(struct path *path, int flags) { static void ksu_umount_mnt(struct path *path, int flags)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0) #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
int err = path_umount(path, flags); int err = path_umount(path, flags);
if (err) { if (err) {
@@ -502,6 +504,11 @@ static void try_umount(const char *mnt, bool check_mnt, int flags)
return; return;
} }
if (path.dentry != path.mnt->mnt_root) {
// it is not root mountpoint, maybe umounted by others already.
return;
}
// we are only interest in some specific mounts // we are only interest in some specific mounts
if (check_mnt && !should_umount(&path)) { if (check_mnt && !should_umount(&path)) {
return; return;