vasilito
dc68054305
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Perform sanity checking for object sizes for uaccess.h and uio.h. */
|
|
#ifndef __LINUX_UCOPYSIZE_H__
|
|
#define __LINUX_UCOPYSIZE_H__
|
|
|
|
#include <linux/bug.h>
|
|
|
|
#ifdef CONFIG_HARDENED_USERCOPY
|
|
#include <linux/jump_label.h>
|
|
extern void __check_object_size(const void *ptr, unsigned long n,
|
|
bool to_user);
|
|
|
|
DECLARE_STATIC_KEY_MAYBE(CONFIG_HARDENED_USERCOPY_DEFAULT_ON,
|
|
validate_usercopy_range);
|
|
|
|
static __always_inline void check_object_size(const void *ptr, unsigned long n,
|
|
bool to_user)
|
|
{
|
|
if (!__builtin_constant_p(n) &&
|
|
static_branch_maybe(CONFIG_HARDENED_USERCOPY_DEFAULT_ON,
|
|
&validate_usercopy_range)) {
|
|
__check_object_size(ptr, n, to_user);
|
|
}
|
|
}
|
|
#else
|
|
static inline void check_object_size(const void *ptr, unsigned long n,
|
|
bool to_user)
|
|
{ }
|
|
#endif /* CONFIG_HARDENED_USERCOPY */
|
|
|
|
extern void __compiletime_error("copy source size is too small")
|
|
__bad_copy_from(void);
|
|
extern void __compiletime_error("copy destination size is too small")
|
|
__bad_copy_to(void);
|
|
|
|
void __copy_overflow(int size, unsigned long count);
|
|
|
|
static inline void copy_overflow(int size, unsigned long count)
|
|
{
|
|
if (IS_ENABLED(CONFIG_BUG))
|
|
__copy_overflow(size, count);
|
|
}
|
|
|
|
static __always_inline __must_check bool
|
|
check_copy_size(const void *addr, size_t bytes, bool is_source)
|
|
{
|
|
int sz = __builtin_object_size(addr, 0);
|
|
if (unlikely(sz >= 0 && sz < bytes)) {
|
|
if (!__builtin_constant_p(bytes))
|
|
copy_overflow(sz, bytes);
|
|
else if (is_source)
|
|
__bad_copy_from();
|
|
else
|
|
__bad_copy_to();
|
|
return false;
|
|
}
|
|
if (WARN_ON_ONCE(bytes > INT_MAX))
|
|
return false;
|
|
check_object_size(addr, bytes, is_source);
|
|
return true;
|
|
}
|
|
|
|
#endif /* __LINUX_UCOPYSIZE_H__ */
|