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Kernel: Wrap process address spaces in SpinlockProtected

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This forces anyone who wants to look into and/or manipulate an address
space to lock it. And this replaces the previous, more flimsy, manual
spinlock use.

Note that pointers *into* the address space are not safe to use after
you unlock the space. We've got many issues like this, and we'll have
to track those down as wlel.
This commit is contained in:
Andreas Kling 2022-08-23 17:58:05 +02:00
parent d6ef18f587
commit cf16b2c8e6
38 changed files with 708 additions and 627 deletions
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4
Kernel/FileSystem/AnonymousFile.cpp
View file

@ -17,12 +17,12 @@ AnonymousFile::AnonymousFile(NonnullLockRefPtr<Memory::AnonymousVMObject> vmobje
AnonymousFile::~AnonymousFile() = default;
ErrorOr<Memory::Region*> AnonymousFile::mmap(Process& process, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
ErrorOr<Memory::Region*> AnonymousFile::mmap(Process&, Memory::AddressSpace& address_space, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
if (offset != 0)
return EINVAL;
return process.address_space().allocate_region_with_vmobject(range, m_vmobject, offset, {}, prot, shared);
return address_space.allocate_region_with_vmobject(range, m_vmobject, offset, {}, prot, shared);
}
ErrorOr<NonnullOwnPtr<KString>> AnonymousFile::pseudo_path(OpenFileDescription const&) const

2
Kernel/FileSystem/AnonymousFile.h
View file

@ -20,7 +20,7 @@ public:
virtual ~AnonymousFile() override;
virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
virtual ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
private:
virtual StringView class_name() const override { return "AnonymousFile"sv; }

2
Kernel/FileSystem/File.cpp
View file

@ -35,7 +35,7 @@ ErrorOr<void> File::ioctl(OpenFileDescription&, unsigned, Userspace<void*>)
return ENOTTY;
}
ErrorOr<Memory::Region*> File::mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64, int, bool)
ErrorOr<Memory::Region*> File::mmap(Process&, Memory::AddressSpace&, OpenFileDescription&, Memory::VirtualRange const&, u64, int, bool)
{
return ENODEV;
}

2
Kernel/FileSystem/File.h
View file

@ -90,7 +90,7 @@ public:
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) = 0;
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) = 0;
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg);
virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
virtual ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
virtual ErrorOr<struct stat> stat() const { return EBADF; }
// Although this might be better described "name" or "description", these terms already have other meanings.

4
Kernel/FileSystem/InodeFile.cpp
View file

@ -85,7 +85,7 @@ ErrorOr<void> InodeFile::ioctl(OpenFileDescription& description, unsigned reques
}
}
ErrorOr<Memory::Region*> InodeFile::mmap(Process& process, OpenFileDescription& description, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
ErrorOr<Memory::Region*> InodeFile::mmap(Process&, Memory::AddressSpace& address_space, OpenFileDescription& description, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
LockRefPtr<Memory::InodeVMObject> vmobject;
@ -94,7 +94,7 @@ ErrorOr<Memory::Region*> InodeFile::mmap(Process& process, OpenFileDescription&
else
vmobject = TRY(Memory::PrivateInodeVMObject::try_create_with_inode(inode()));
auto path = TRY(description.pseudo_path());
return process.address_space().allocate_region_with_vmobject(range, vmobject.release_nonnull(), offset, path->view(), prot, shared);
return address_space.allocate_region_with_vmobject(range, vmobject.release_nonnull(), offset, path->view(), prot, shared);
}
ErrorOr<NonnullOwnPtr<KString>> InodeFile::pseudo_path(OpenFileDescription const&) const

2
Kernel/FileSystem/InodeFile.h
View file

@ -33,7 +33,7 @@ public:
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
virtual ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
virtual ErrorOr<struct stat> stat() const override { return inode().metadata().stat(); }
virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;

4
Kernel/FileSystem/OpenFileDescription.cpp
View file

@ -374,9 +374,9 @@ InodeMetadata OpenFileDescription::metadata() const
return {};
}
ErrorOr<Memory::Region*> OpenFileDescription::mmap(Process& process, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
ErrorOr<Memory::Region*> OpenFileDescription::mmap(Process& process, Memory::AddressSpace& address_space, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
return m_file->mmap(process, *this, range, offset, prot, shared);
return m_file->mmap(process, address_space, *this, range, offset, prot, shared);
}
ErrorOr<void> OpenFileDescription::truncate(u64 length)

2
Kernel/FileSystem/OpenFileDescription.h
View file

@ -92,7 +92,7 @@ public:
RefPtr<Custody> custody();
RefPtr<Custody const> custody() const;
ErrorOr<Memory::Region*> mmap(Process&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
bool is_blocking() const;
void set_blocking(bool b);