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Revert "kernel: sucompat: increase reliability, commonize and micro-optimize tiann #2656"

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This reverts commit dd1eb98963.
This commit is contained in:
ShirkNeko
2025-09-28 19:36:36 +08:00
parent 7c4334e03a
commit 3a4775306e
5 changed files with 223 additions and 84 deletions
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24
kernel/kernel_compat.h
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@@ -57,6 +57,13 @@ static inline __maybe_unused size_t list_count_nodes(const struct list_head *hea
#endif
#endif
extern long ksu_strncpy_from_user_nofault(char *dst,
const void __user *unsafe_addr,
long count);
extern long ksu_strncpy_from_user_retry(char *dst,
const void __user *unsafe_addr,
long count);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || \
defined(CONFIG_IS_HW_HISI) || \
defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
@@ -71,7 +78,22 @@ extern ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
extern ssize_t ksu_kernel_write_compat(struct file *p, const void *buf,
size_t count, loff_t *pos);
extern long ksu_copy_from_user_nofault(void *dst, const void __user *src, size_t size);
extern long ksu_copy_from_user_retry(void *to, const void __user *from, unsigned long count);
/*
* ksu_copy_from_user_retry
* try nofault copy first, if it fails, try with plain
* paramters are the same as copy_from_user
* 0 = success
*/
static long ksu_copy_from_user_retry(void *to,
const void __user *from, unsigned long count)
{
long ret = ksu_copy_from_user_nofault(to, from, count);
if (likely(!ret))
return ret;
// we faulted! fallback to slow path
return copy_from_user(to, from, count);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
#define ksu_access_ok(addr, size) access_ok(addr, size)