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kernel: fix su not working in shell for 6.1 kernel

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weishu
2023-11-13 15:06:25 +08:00
parent 8fdff569d6
commit b7f937b7f9
1 changed files with 14 additions and 0 deletions
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14
kernel/sucompat.c
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@@ -75,12 +75,26 @@ int ksu_handle_stat(int *dfd, const char __user **filename_user, int *flags)
char path[sizeof(su) + 1]; char path[sizeof(su) + 1];
memset(path, 0, sizeof(path)); memset(path, 0, sizeof(path));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 18, 0)
// it becomes a `struct filename *` after 5.18
// https://elixir.bootlin.com/linux/v5.18/source/fs/stat.c#L216
const char sh[] = SH_PATH;
struct filename *filename = * ((struct filename **) filename_user);
if (IS_ERR(filename)) {
return 0;
}
if (likely(memcmp(filename->name, su, sizeof(su))))
return 0;
pr_info("vfs_statx su->sh!\n");
memcpy((void *)filename->name, sh, sizeof(sh));
#else
ksu_strncpy_from_user_nofault(path, *filename_user, sizeof(path)); ksu_strncpy_from_user_nofault(path, *filename_user, sizeof(path));
if (unlikely(!memcmp(path, su, sizeof(su)))) { if (unlikely(!memcmp(path, su, sizeof(su)))) {
pr_info("newfstatat su->sh!\n"); pr_info("newfstatat su->sh!\n");
*filename_user = sh_user_path(); *filename_user = sh_user_path();
} }
#endif
return 0; return 0;
} }