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Kernel: Allow PROT_NONE in mmap and mprotect for stack regions

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To allow for userspace guard pages (ruby uses this).
Redundant since serenity creates them automatically,
but should be allowed anyway.
This commit is contained in:
Eric Seifert 2021-09-22 17:56:12 -07:00 • committed by Brian Gianforcaro
commit 8924b1f532
Notes: sideshowbarker 2024-07-18 03:33:07 +09:00
1 changed files with 2 additions and 6 deletions
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8
Kernel/Syscalls/mmap.cpp
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@ -80,12 +80,8 @@ static bool validate_mmap_prot(int prot, bool map_stack, bool map_anonymous, Mem
if (make_writable && make_executable)
return false;
if (map_stack) {
if (make_executable)
return false;
if (!make_readable || !make_writable)
return false;
}
if (map_stack && make_executable)
return false;
if (region) {
if (make_writable && region->has_been_executable())