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Kernel: Make SharedInodeVMObject allocation OOM-safe

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This commit is contained in:
Andreas Kling 2021-07-11 17:52:07 +02:00
parent 59049ae4b7
commit af8c74a328
4 changed files with 17 additions and 6 deletions
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2
Kernel/FileSystem/InodeFile.cpp
View file

@ -97,7 +97,7 @@ KResultOr<Region*> InodeFile::mmap(Process& process, FileDescription& descriptio
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
RefPtr<InodeVMObject> vmobject;
if (shared)
vmobject = SharedInodeVMObject::create_with_inode(inode());
vmobject = SharedInodeVMObject::try_create_with_inode(inode());
else
vmobject = PrivateInodeVMObject::create_with_inode(inode());
if (!vmobject)

13
Kernel/Syscalls/execve.cpp
View file

@ -162,7 +162,11 @@ struct RequiredLoadRange {
static KResultOr<RequiredLoadRange> get_required_load_range(FileDescription& program_description)
{
auto& inode = *(program_description.inode());
auto vmobject = SharedInodeVMObject::create_with_inode(inode);
auto vmobject = SharedInodeVMObject::try_create_with_inode(inode);
if (!vmobject) {
dbgln("get_required_load_range: Unable to allocate SharedInodeVMObject");
return ENOMEM;
}
size_t executable_size = inode.size();
@ -263,7 +267,12 @@ static KResultOr<LoadResult> load_elf_object(NonnullOwnPtr<Space> new_space, Fil
FlatPtr load_offset, ShouldAllocateTls should_allocate_tls, ShouldAllowSyscalls should_allow_syscalls)
{
auto& inode = *(object_description.inode());
auto vmobject = SharedInodeVMObject::create_with_inode(inode);
auto vmobject = SharedInodeVMObject::try_create_with_inode(inode);
if (!vmobject) {
dbgln("load_elf_object: Unable to allocate SharedInodeVMObject");
return ENOMEM;
}
if (vmobject->writable_mappings()) {
dbgln("Refusing to execute a write-mapped program");
return ETXTBSY;

6
Kernel/VM/SharedInodeVMObject.cpp
View file

@ -9,12 +9,14 @@
namespace Kernel {
NonnullRefPtr<SharedInodeVMObject> SharedInodeVMObject::create_with_inode(Inode& inode)
RefPtr<SharedInodeVMObject> SharedInodeVMObject::try_create_with_inode(Inode& inode)
{
size_t size = inode.size();
if (auto shared_vmobject = inode.shared_vmobject())
return shared_vmobject.release_nonnull();
auto vmobject = adopt_ref(*new SharedInodeVMObject(inode, size));
auto vmobject = adopt_ref_if_nonnull(new (nothrow) SharedInodeVMObject(inode, size));
if (!vmobject)
return nullptr;
vmobject->inode().set_shared_vmobject(*vmobject);
return vmobject;
}

2
Kernel/VM/SharedInodeVMObject.h
View file

@ -16,7 +16,7 @@ class SharedInodeVMObject final : public InodeVMObject {
AK_MAKE_NONMOVABLE(SharedInodeVMObject);
public:
static NonnullRefPtr<SharedInodeVMObject> create_with_inode(Inode&);
static RefPtr<SharedInodeVMObject> try_create_with_inode(Inode&);
virtual RefPtr<VMObject> clone() override;
private: