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Kernel: Assert if rounding-up-to-page-size would wrap around to 0

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If we try to align a number above 0xfffff000 to the next multiple of
the page size (4 KiB), it would wrap around to 0. This is most likely
never what we want, so let's assert if that happens.
This commit is contained in:
Andreas Kling
2021-02-14 09:57:19 +01:00
parent 198d641808
commit 09b1b09c19
19 changed files with 67 additions and 40 deletions
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6
Kernel/Syscalls/execve.cpp
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@@ -167,7 +167,7 @@ static KResultOr<RequiredLoadRange> get_required_load_range(FileDescription& pro
size_t executable_size = inode.size();
auto region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_ROUND_UP(executable_size), "ELF memory range calculation", Region::Access::Read);
auto region = MM.allocate_kernel_region_with_vmobject(*vmobject, page_round_up(executable_size), "ELF memory range calculation", Region::Access::Read);
if (!region) {
dbgln("Could not allocate memory for ELF");
return ENOMEM;
@@ -203,7 +203,7 @@ static KResultOr<FlatPtr> get_interpreter_load_offset(const Elf32_Ehdr& main_pro
constexpr FlatPtr minimum_interpreter_load_offset_randomization_size = 10 * MiB;
auto random_load_offset_in_range([](auto start, auto size) {
return PAGE_ROUND_DOWN(start + get_good_random<FlatPtr>() % size);
return page_round_down(start + get_good_random<FlatPtr>() % size);
});
if (main_program_header.e_type == ET_DYN) {
@@ -263,7 +263,7 @@ static KResultOr<LoadResult> load_elf_object(NonnullOwnPtr<Space> new_space, Fil
size_t executable_size = inode.size();
auto executable_region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_ROUND_UP(executable_size), "ELF loading", Region::Access::Read);
auto executable_region = MM.allocate_kernel_region_with_vmobject(*vmobject, page_round_up(executable_size), "ELF loading", Region::Access::Read);
if (!executable_region) {
dbgln("Could not allocate memory for ELF loading");
return ENOMEM;