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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/24/2023 11:37 AM, Will Deacon wrote: > On Fri, Mar 03, 2023 at 05:06:18PM -0800, Elliot Berman wrote: >> When launching a virtual machine, Gunyah userspace allocates memory for >> the guest and informs Gunyah about these memory regions through >> SET_USER_MEMORY_REGION ioctl. >> >> Co-developed-by: Prakruthi Deepak Heragu >> Signed-off-by: Prakruthi Deepak Heragu >> Signed-off-by: Elliot Berman >> --- >> drivers/virt/gunyah/Makefile | 2 +- >> drivers/virt/gunyah/vm_mgr.c | 44 ++++++ >> drivers/virt/gunyah/vm_mgr.h | 25 ++++ >> drivers/virt/gunyah/vm_mgr_mm.c | 229 ++++++++++++++++++++++++++++++++ >> include/uapi/linux/gunyah.h | 29 ++++ >> 5 files changed, 328 insertions(+), 1 deletion(-) >> create mode 100644 drivers/virt/gunyah/vm_mgr_mm.c > > [...] > >> +int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region) >> +{ >> + struct gh_vm_mem *mapping, *tmp_mapping; >> + struct gh_rm_mem_entry *mem_entries; >> + phys_addr_t curr_page, prev_page; >> + struct gh_rm_mem_parcel *parcel; >> + int i, j, pinned, ret = 0; >> + size_t entry_size; >> + u16 vmid; >> + >> + if (!region->memory_size || !PAGE_ALIGNED(region->memory_size) || >> + !PAGE_ALIGNED(region->userspace_addr) || !PAGE_ALIGNED(region->guest_phys_addr)) >> + return -EINVAL; >> + >> + if (region->guest_phys_addr + region->memory_size < region->guest_phys_addr) >> + return -EOVERFLOW; >> + >> + ret = mutex_lock_interruptible(&ghvm->mm_lock); >> + if (ret) >> + return ret; >> + >> + mapping = __gh_vm_mem_find_by_label(ghvm, region->label); >> + if (mapping) { >> + mutex_unlock(&ghvm->mm_lock); >> + return -EEXIST; >> + } >> + >> + mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); >> + if (!mapping) { >> + mutex_unlock(&ghvm->mm_lock); >> + return -ENOMEM; >> + } >> + >> + mapping->parcel.label = region->label; >> + mapping->guest_phys_addr = region->guest_phys_addr; >> + mapping->npages = region->memory_size >> PAGE_SHIFT; >> + parcel = &mapping->parcel; >> + parcel->mem_handle = GH_MEM_HANDLE_INVAL; /* to be filled later by mem_share/mem_lend */ >> + parcel->mem_type = GH_RM_MEM_TYPE_NORMAL; >> + >> + /* Check for overlap */ >> + list_for_each_entry(tmp_mapping, &ghvm->memory_mappings, list) { >> + if (!((mapping->guest_phys_addr + (mapping->npages << PAGE_SHIFT) <= >> + tmp_mapping->guest_phys_addr) || >> + (mapping->guest_phys_addr >= >> + tmp_mapping->guest_phys_addr + (tmp_mapping->npages << PAGE_SHIFT)))) { >> + ret = -EEXIST; >> + goto free_mapping; >> + } >> + } >> + >> + list_add(&mapping->list, &ghvm->memory_mappings); >> + >> + mapping->pages = kcalloc(mapping->npages, sizeof(*mapping->pages), GFP_KERNEL); >> + if (!mapping->pages) { >> + ret = -ENOMEM; >> + mapping->npages = 0; /* update npages for reclaim */ >> + goto reclaim; >> + } >> + >> + pinned = pin_user_pages_fast(region->userspace_addr, mapping->npages, >> + FOLL_WRITE | FOLL_LONGTERM, mapping->pages); >> + if (pinned < 0) { >> + ret = pinned; >> + mapping->npages = 0; /* update npages for reclaim */ >> + goto reclaim; >> + } else if (pinned != mapping->npages) { >> + ret = -EFAULT; >> + mapping->npages = pinned; /* update npages for reclaim */ >> + goto reclaim; >> + } > > I think Fuad mentioned this on an older version of these patches, but it > looks like you're failing to account for the pinned memory here which is > a security issue depending on who is able to issue the ioctl() calling > into here. > > Specifically, I'm thinking that your kXalloc() calls should be using > GFP_KERNEL_ACCOUNT in this function and also that you should be calling > account_locked_vm() for the pages being pinned. > Added the accounting for the v12. > Finally, what happens if userspace passes in a file mapping? Userspace will get EBADADDR (-14) back when trying to launch the VM (pin_user_pages_fast returns this as you might have been expecting). We haven't yet had any need to support file-backed mappings. Thanks, Elliot _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel