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Kernel: Ensure that an unveil node with no permission is never accepted

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Otherwise nodes inheriting from root may still be accessed with
`access(..., F_OK)`.
Also adds a test case to TestKernelUnveil about this behaviour.
This commit is contained in:
Ali Mohammad Pur 2021-05-30 00:05:55 +04:30 • committed by Andreas Kling
parent 8ce015742d
commit 90de1ded55
Notes: sideshowbarker 2024-07-18 17:11:46 +09:00
2 changed files with 5 additions and 1 deletions
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2
Kernel/FileSystem/VirtualFileSystem.cpp
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@ -851,7 +851,7 @@ KResult VFS::validate_path_against_process_veil(StringView path, int options)
return EINVAL;
auto* unveiled_path = find_matching_unveiled_path(path);
if (!unveiled_path) {
if (!unveiled_path || unveiled_path->permissions() == UnveilAccess::None) {
dbgln("Rejecting path '{}' since it hasn't been unveiled.", path);
dump_backtrace();
return ENOENT;