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89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
#include <linux/version.h>
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#include <linux/fs.h>
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#include <linux/nsproxy.h>
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#include <linux/sched/task.h>
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#include <linux/uaccess.h>
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#include "klog.h" // IWYU pragma: keep
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#include "kernel_compat.h"
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extern struct task_struct init_task;
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// mnt_ns context switch for environment that android_init->nsproxy->mnt_ns != init_task.nsproxy->mnt_ns, such as WSA
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struct ksu_ns_fs_saved {
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struct nsproxy *ns;
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struct fs_struct *fs;
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};
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static void ksu_save_ns_fs(struct ksu_ns_fs_saved *ns_fs_saved)
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{
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ns_fs_saved->ns = current->nsproxy;
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ns_fs_saved->fs = current->fs;
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}
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static void ksu_load_ns_fs(struct ksu_ns_fs_saved *ns_fs_saved)
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{
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current->nsproxy = ns_fs_saved->ns;
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current->fs = ns_fs_saved->fs;
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}
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static bool android_context_saved_checked = false;
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static bool android_context_saved_enabled = false;
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static struct ksu_ns_fs_saved android_context_saved;
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void ksu_android_ns_fs_check()
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{
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if (android_context_saved_checked)
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return;
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android_context_saved_checked = true;
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task_lock(current);
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if (current->nsproxy && current->fs &&
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current->nsproxy->mnt_ns != init_task.nsproxy->mnt_ns) {
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android_context_saved_enabled = true;
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pr_info("android context saved enabled due to init mnt_ns(%p) != android mnt_ns(%p)\n",
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current->nsproxy->mnt_ns, init_task.nsproxy->mnt_ns);
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ksu_save_ns_fs(&android_context_saved);
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} else {
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pr_info("android context saved disabled\n");
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}
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task_unlock(current);
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}
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struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
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{
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// switch mnt_ns even if current is not wq_worker, to ensure what we open is the correct file in android mnt_ns, rather than user created mnt_ns
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struct ksu_ns_fs_saved saved;
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if (android_context_saved_enabled) {
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pr_info("start switch current nsproxy and fs to android context\n");
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task_lock(current);
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ksu_save_ns_fs(&saved);
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ksu_load_ns_fs(&android_context_saved);
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task_unlock(current);
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}
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struct file *fp = filp_open(filename, flags, mode);
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if (android_context_saved_enabled) {
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task_lock(current);
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ksu_load_ns_fs(&saved);
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task_unlock(current);
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pr_info("switch current nsproxy and fs back to saved successfully\n");
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}
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return fp;
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}
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ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
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loff_t *pos)
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{
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return kernel_read(p, buf, count, pos);
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}
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ssize_t ksu_kernel_write_compat(struct file *p, const void *buf, size_t count,
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loff_t *pos)
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{
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return kernel_write(p, buf, count, pos);
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}
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long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
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long count)
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{
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return strncpy_from_user_nofault(dst, unsafe_addr, count);
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}
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