_xeroxz
/
physmeme
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

sometimes the gdrv returns an invalid virtual address that is 1 page

Browse Source 
ahead of the actual mapping... added a try/catch around memcmp
master
xerox 4 years ago
parent 61fb1b0638
commit 48e3357155
2 changed files with 110 additions and 78 deletions
Show Stats Download Patch File Download Diff File

94
physmeme-lib/kernel_ctx/kernel_ctx.cpp
Unescape View File

@ -43,22 +43,30 @@ namespace physmeme
{
// scan every page of the physical memory range
for (auto page = page_va; page < page_va + end; page += 0x1000)
{
if (!is_page_found.load()) // keep scanning until its found
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, end);
}
}
@ -77,21 +85,25 @@ namespace physmeme
{
if (!is_page_found.load())
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, 0x1000 * 512);
@ -106,21 +118,25 @@ namespace physmeme
{
if (!is_page_found.load())
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, remainder);

94
physmeme/kernel_ctx/kernel_ctx.cpp
Unescape View File

@ -43,22 +43,30 @@ namespace physmeme
{
// scan every page of the physical memory range
for (auto page = page_va; page < page_va + end; page += 0x1000)
{
if (!is_page_found.load()) // keep scanning until its found
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, end);
}
}
@ -77,21 +85,25 @@ namespace physmeme
{
if (!is_page_found.load())
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, 0x1000 * 512);
@ -106,21 +118,25 @@ namespace physmeme
{
if (!is_page_found.load())
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
__try
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
physmeme::unmap_phys(page_va, remainder);

Write Preview
Loading…
Cancel
Save