CVE-2024-46738

In the Linux kernel, the following vulnerability has been resolved:

VMCI: Fix use-after-free when removing resource in vmci_resource_remove()

When removing a resource from vmci_resource_table in

vmci_resource_remove(), the search is performed using the resource

handle by comparing context and resource fields.

It is possible though to create two resources with different types

but same handle (same context and resource fields).

When trying to remove one of the resources, vmci_resource_remove()

may not remove the intended one, but the object will still be freed

as in the case of the datagram type in vmci_datagram_destroy_handle().

vmci_resource_table will still hold a pointer to this freed resource

leading to a use-after-free vulnerability.

BUG: KASAN: use-after-free in vmci_handle_is_equal include/linux/vmw_vmci_defs.h:142 [inline]

BUG: KASAN: use-after-free in vmci_resource_remove+0x3a1/0x410 drivers/misc/vmw_vmci/vmci_resource.c:147

Read of size 4 at addr ffff88801c16d800 by task syz-executor197/1592

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0x82/0xa9 lib/dump_stack.c:106

print_address_description.constprop.0+0x21/0x366 mm/kasan/report.c:239

__kasan_report.cold+0x7f/0x132 mm/kasan/report.c:425

kasan_report+0x38/0x51 mm/kasan/report.c:442

vmci_handle_is_equal include/linux/vmw_vmci_defs.h:142 [inline]

vmci_resource_remove+0x3a1/0x410 drivers/misc/vmw_vmci/vmci_resource.c:147

vmci_qp_broker_detach+0x89a/0x11b9 drivers/misc/vmw_vmci/vmci_queue_pair.c:2182

ctx_free_ctx+0x473/0xbe1 drivers/misc/vmw_vmci/vmci_context.c:444

kref_put include/linux/kref.h:65 [inline]

vmci_ctx_put drivers/misc/vmw_vmci/vmci_context.c:497 [inline]

vmci_ctx_destroy+0x170/0x1d6 drivers/misc/vmw_vmci/vmci_context.c:195

vmci_host_close+0x125/0x1ac drivers/misc/vmw_vmci/vmci_host.c:143

__fput+0x261/0xa34 fs/file_table.c:282

task_work_run+0xf0/0x194 kernel/task_work.c:164

tracehook_notify_resume include/linux/tracehook.h:189 [inline]

exit_to_user_mode_loop+0x184/0x189 kernel/entry/common.c:187

exit_to_user_mode_prepare+0x11b/0x123 kernel/entry/common.c:220

__syscall_exit_to_user_mode_work kernel/entry/common.c:302 [inline]

syscall_exit_to_user_mode+0x18/0x42 kernel/entry/common.c:313

do_syscall_64+0x41/0x85 arch/x86/entry/common.c:86

entry_SYSCALL_64_after_hwframe+0x6e/0x0

This change ensures the type is also checked when removing

the resource from vmci_resource_table in vmci_resource_remove().