CVE-2023-53090

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amdkfd: Fix an illegal memory access<br /> <br /> In the kfd_wait_on_events() function, the kfd_event_waiter structure is<br /> allocated by alloc_event_waiters(), but the event field of the waiter<br /> structure is not initialized; When copy_from_user() fails in the<br /> kfd_wait_on_events() function, it will enter exception handling to<br /> release the previously allocated memory of the waiter structure;<br /> Due to the event field of the waiters structure being accessed<br /> in the free_waiters() function, this results in illegal memory access<br /> and system crash, here is the crash log:<br /> <br /> localhost kernel: RIP: 0010:native_queued_spin_lock_slowpath+0x185/0x1e0<br /> localhost kernel: RSP: 0018:ffffaa53c362bd60 EFLAGS: 00010082<br /> localhost kernel: RAX: ff3d3d6bff4007cb RBX: 0000000000000282 RCX: 00000000002c0000<br /> localhost kernel: RDX: ffff9e855eeacb80 RSI: 000000000000279c RDI: ffffe7088f6a21d0<br /> localhost kernel: RBP: ffffe7088f6a21d0 R08: 00000000002c0000 R09: ffffaa53c362be64<br /> localhost kernel: R10: ffffaa53c362bbd8 R11: 0000000000000001 R12: 0000000000000002<br /> localhost kernel: R13: ffff9e7ead15d600 R14: 0000000000000000 R15: ffff9e7ead15d698<br /> localhost kernel: FS: 0000152a3d111700(0000) GS:ffff9e855ee80000(0000) knlGS:0000000000000000<br /> localhost kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> localhost kernel: CR2: 0000152938000010 CR3: 000000044d7a4000 CR4: 00000000003506e0<br /> localhost kernel: Call Trace:<br /> localhost kernel: _raw_spin_lock_irqsave+0x30/0x40<br /> localhost kernel: remove_wait_queue+0x12/0x50<br /> localhost kernel: kfd_wait_on_events+0x1b6/0x490 [hydcu]<br /> localhost kernel: ? ftrace_graph_caller+0xa0/0xa0<br /> localhost kernel: kfd_ioctl+0x38c/0x4a0 [hydcu]<br /> localhost kernel: ? kfd_ioctl_set_trap_handler+0x70/0x70 [hydcu]<br /> localhost kernel: ? kfd_ioctl_create_queue+0x5a0/0x5a0 [hydcu]<br /> localhost kernel: ? ftrace_graph_caller+0xa0/0xa0<br /> localhost kernel: __x64_sys_ioctl+0x8e/0xd0<br /> localhost kernel: ? syscall_trace_enter.isra.18+0x143/0x1b0<br /> localhost kernel: do_syscall_64+0x33/0x80<br /> localhost kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9<br /> localhost kernel: RIP: 0033:0x152a4dff68d7<br /> <br /> Allocate the structure with kcalloc, and remove redundant 0-initialization<br /> and a redundant loop condition check.