diff options
Diffstat (limited to 'kernel/features/mm.c')
| -rw-r--r-- | kernel/features/mm.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/features/mm.c b/kernel/features/mm.c index d9e4577..9f0bd07 100644 --- a/kernel/features/mm.c +++ b/kernel/features/mm.c @@ -602,11 +602,17 @@ void memory_bypass_disable(void) u8 memory_is_user(const void *addr) { + if (!addr) + return 0; + return PDI((u32)addr) >= PAGE_KERNEL_COUNT; } u8 memory_readable(const void *addr) { + if (!addr) + return 0; + struct proc *proc = proc_current(); if (proc && !memory_bypass_validity) return memory_is_user(addr) && virtual_user_readable(proc->page_dir, (u32)addr); @@ -616,6 +622,9 @@ u8 memory_readable(const void *addr) u8 memory_writable(const void *addr) { + if (!addr) + return 0; + struct proc *proc = proc_current(); if (proc && !memory_bypass_validity) return memory_is_user(addr) && virtual_user_writable(proc->page_dir, (u32)addr); |