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| author | Tom <tomut@yahoo.com> | 2020-09-10 19:49:31 -0600 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2020-09-13 21:19:15 +0200 |
| commit | 7d1b8417bdf5d2818d1c9d310786cdf59650b104 (patch) | |
| tree | cb708ca30c6528286ad67fddd92624f6a1920e4b /Kernel/Arch/i386/CPU.h | |
| parent | 1c86ab010824b3e7985c99ff0fc604b0cd42f68d (diff) | |
| download | serenity-7d1b8417bdf5d2818d1c9d310786cdf59650b104.zip | |
Kernel: Add safe_memcpy, safe_memset and safe_strnlen
These special functions can be used to safely copy/set memory or
determine the length of a string, e.g. provided by user mode.
In the event of a page fault, safe_memcpy/safe_memset will return
false and safe_strnlen will return -1.
Diffstat (limited to 'Kernel/Arch/i386/CPU.h')
| -rw-r--r-- | Kernel/Arch/i386/CPU.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Kernel/Arch/i386/CPU.h b/Kernel/Arch/i386/CPU.h index 44bbcfb4c5..0431c60ca1 100644 --- a/Kernel/Arch/i386/CPU.h +++ b/Kernel/Arch/i386/CPU.h @@ -279,6 +279,10 @@ void flush_idt(); void load_task_register(u16 selector); void handle_crash(RegisterState&, const char* description, int signal, bool out_of_memory = false); +[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at); +[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at); +[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at); + #define LSW(x) ((u32)(x)&0xFFFF) #define MSW(x) (((u32)(x) >> 16) & 0xFFFF) #define LSB(x) ((x)&0xFF) |