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kernel: use ksu_strncpy_from_user_retry when kprobes hook sucompat pagefaults

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Rifat Azad
2025-07-16 21:06:59 +06:00
parent b04f45c278
commit 89c9b1b8b8
1 changed files with 2 additions and 17 deletions
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19
kernel/sucompat.c
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@@ -211,23 +211,8 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
if (unlikely(!filename_user))
return 0;
// nofault variant fails probably due to pagefault_disable
// some cpus dont really have that good speculative execution
// substitute set_fs, check if pointer is valid
#if LINUX_VERSION_CODE < KERNEL_VERSION(5,0,0)
if (!access_ok(VERIFY_READ, *filename_user, sizeof(path)))
return 0;
#else
if (!access_ok(*filename_user, sizeof(path)))
return 0;
#endif
// success = returns number of bytes and should be less than path
long len = strncpy_from_user(path, *filename_user, sizeof(path));
if (len <= 0 || len > sizeof(path))
return 0;
// strncpy_from_user_nofault does this too
path[sizeof(path) - 1] = '\0';
memset(path, 0, sizeof(path));
ksu_strncpy_from_user_retry(path, *filename_user, sizeof(path));
if (likely(memcmp(path, su, sizeof(su))))
return 0;