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Kernel: Don't let locks of the same owner conflict with each other

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Documentation on POSIX locks seems sparse, but this is how the Linux
kernel implementation handles it.
This commit is contained in:
Tim Schumacher 2022-06-17 19:06:05 +02:00 • committed by Brian Gianforcaro
commit cd189999d1
Notes: sideshowbarker 2024-07-17 09:35:30 +09:00
1 changed files with 4 additions and 0 deletions
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4
Kernel/FileSystem/Inode.cpp
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@ -348,6 +348,10 @@ ErrorOr<void> Inode::get_flock(OpenFileDescription const& description, Userspace
if (!range_overlap(lock.start, lock.len, lookup.l_start, lookup.l_len))
continue;
// Locks with the same owner can't conflict with each other.
if (lock.pid == Process::current().pid())
continue;
if ((lookup.l_type == F_RDLCK && lock.type == F_WRLCK) || lookup.l_type == F_WRLCK) {
lookup = { lock.type, SEEK_SET, lock.start, lock.len, lock.pid };
return copy_to_user(reference_lock, &lookup);