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Clean up kernel code (#2898)

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1) Fix memory leak of callback head in allowlist.c
2) Remove duplicated logic and incorrect log in kernel_umount.c
3) Prevent sleep in kprobe context in ksud.c
4) Remove useless is_unsupported_uid, use euid for security enhance,
   add FIXME in setuid_hook.c
5) Remove useless fd argument for execve hook, fix incorrent pointer
   usage in syscall_hook_manager.c and sucompat.c
6) Use correct errno in supercalls.c

---------

Co-authored-by: Ylarod <me@ylarod.cn>
This commit is contained in:
ShirkNeko
2025-11-09 19:20:30 +08:00
parent ad0f3f6025
commit 3a0f9b4e2c
8 changed files with 39 additions and 49 deletions
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8
kernel/sucompat.c
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@@ -63,8 +63,8 @@ bool ksu_sucompat_hook_state __read_mostly = true;
static inline void __user *userspace_stack_buffer(const void *d, size_t len)
{
/* To avoid having to mmap a page in userspace, just write below the stack
* pointer. */
// To avoid having to mmap a page in userspace, just write below the stack
// pointer.
char __user *p = (void __user *)current_user_stack_pointer() - len;
return copy_to_user(p, d, len) ? NULL : p;
@@ -190,7 +190,7 @@ int ksu_handle_stat(int *dfd, const char __user **filename_user, int *flags)
return 0;
}
int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
int ksu_handle_execve_sucompat(const char __user **filename_user,
void *__never_use_argv, void *__never_use_envp,
int *__never_use_flags)
{
@@ -282,7 +282,7 @@ int __ksu_handle_devpts(struct inode *inode)
return 0;
}
// sucompat: permited process can execute 'su' to gain root access.
// sucompat: permitted process can execute 'su' to gain root access.
void ksu_sucompat_init()
{
if (ksu_register_feature_handler(&su_compat_handler)) {