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Kernel/Syscall: Make anon_create to not use Process::allocate_fd method

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Instead, allocate when acquiring the lock on m_fds struct, which is
safer to do in terms of safely mutating the m_fds struct, because we
don't use the big process lock in this syscall.
This commit is contained in:
Liav A 2022-08-19 13:29:43 +03:00 committed by Linus Groh
parent 0eaee045cf
commit 5331d243c6
Notes: sideshowbarker 2024-07-17 20:58:35 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/5331d243c6
Pull-request: https://github.com/SerenityOS/serenity/pull/14921
1 changed files with 5 additions and 3 deletions
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8
Kernel/Syscalls/anon_create.cpp
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@ -25,7 +25,6 @@ ErrorOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
if (size > NumericLimits<ssize_t>::max())
return EINVAL;
auto new_fd = TRY(allocate_fd());
auto vmobject = TRY(Memory::AnonymousVMObject::try_create_purgeable_with_size(size, AllocationStrategy::AllocateNow));
auto anon_file = TRY(AnonymousFile::try_create(move(vmobject)));
auto description = TRY(OpenFileDescription::try_create(move(anon_file)));
@ -37,8 +36,11 @@ ErrorOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
if (options & O_CLOEXEC)
fd_flags |= FD_CLOEXEC;
m_fds.with_exclusive([&](auto& fds) { fds[new_fd.fd].set(move(description), fd_flags); });
return new_fd.fd;
return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
auto new_fd = TRY(fds.allocate());
fds[new_fd.fd].set(move(description), fd_flags);
return new_fd.fd;
});
}
}