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Kernel: Fix rounding of PT_LOAD mappings in sys$execve()

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We were not rounding the mappings down/up correctly, which could lead
to executables missing the last 4 KB of text and/or data.
This commit is contained in:
Andreas Kling 2021-03-12 17:26:24 +01:00
parent 4c7f486f39
commit 423ed53396
Notes: sideshowbarker 2024-07-18 21:28:14 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/423ed533965
1 changed files with 5 additions and 1 deletions
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6
Kernel/Syscalls/execve.cpp
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@ -340,7 +340,11 @@ static KResultOr<LoadResult> load_elf_object(NonnullOwnPtr<Space> new_space, Fil
if (program_header.is_writable())
prot |= PROT_WRITE;
auto region_name = String::formatted("{} (data-{}{})", elf_name, program_header.is_readable() ? "r" : "", program_header.is_writable() ? "w" : "");
auto range = new_space->allocate_range(program_header.vaddr().offset(load_offset), program_header.size_in_memory());
auto range_base = VirtualAddress { page_round_down(program_header.vaddr().offset(load_offset).get()) };
auto range_end = VirtualAddress { page_round_up(program_header.vaddr().offset(load_offset).offset(program_header.size_in_memory()).get()) };
auto range = new_space->allocate_range(range_base, range_end.get() - range_base.get());
if (!range.has_value()) {
ph_load_result = ENOMEM;
return IterationDecision::Break;