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kernel: use rename lsm hook

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This commit is contained in:
weishu
2023-01-19 16:34:21 +07:00
parent da377a9fa9
commit 2844df865b
4 changed files with 52 additions and 36 deletions
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33
kernel/uid_observer.c
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@@ -126,7 +126,7 @@ static void update_uid()
ksu_queue_work(&ksu_update_uid_work);
}
static int renameat_handler_pre(struct kprobe *p, struct pt_regs *regs)
int ksu_handle_rename(struct dentry *old_dentry, struct dentry *new_dentry)
{
if (!current->mm) {
// skip kernel threads
@@ -138,27 +138,17 @@ static int renameat_handler_pre(struct kprobe *p, struct pt_regs *regs)
return 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
// https://elixir.bootlin.com/linux/v5.12-rc1/source/include/linux/fs.h
struct renamedata *rd = PT_REGS_PARM1(regs);
struct dentry *old_entry = rd->old_dentry;
struct dentry *new_entry = rd->new_dentry;
#else
struct dentry *old_entry = PT_REGS_PARM2(regs);
struct dentry *new_entry = PT_REGS_PARM4(regs);
#endif
if (!old_entry || !new_entry) {
if (!old_dentry || !new_dentry) {
return 0;
}
// /data/system/packages.list.tmp -> /data/system/packages.list
if (strcmp(new_entry->d_iname, "packages.list")) {
if (strcmp(new_dentry->d_iname, "packages.list")) {
return 0;
}
char path[128];
char *buf = dentry_path_raw(new_entry, path, sizeof(path));
char *buf = dentry_path_raw(new_dentry, path, sizeof(path));
if (IS_ERR(buf)) {
pr_err("dentry_path_raw failed.\n");
return 0;
@@ -167,30 +157,21 @@ static int renameat_handler_pre(struct kprobe *p, struct pt_regs *regs)
if (strcmp(buf, "/system/packages.list")) {
return 0;
}
pr_info("renameat: %s -> %s\n, new path: %s", old_entry->d_iname,
new_entry->d_iname, buf);
pr_info("renameat: %s -> %s\n, new path: %s", old_dentry->d_iname,
new_dentry->d_iname, buf);
update_uid();
return 0;
}
static struct kprobe renameat_kp = {
.symbol_name = "vfs_rename",
.pre_handler = renameat_handler_pre,
};
int ksu_uid_observer_init()
{
INIT_WORK(&ksu_update_uid_work, do_update_uid);
int rc = register_kprobe(&renameat_kp);
pr_info("renameat kp: %d\n", rc);
return rc;
return 0;
}
int ksu_uid_observer_exit()
{
unregister_kprobe(&renameat_kp);
return 0;
}