diff options
| author | Kees Cook <keescook@chromium.org> | 2023-09-22 10:51:02 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2023-10-08 22:46:04 -0700 |
| commit | 51a71ab21f61ceb104aad2c9d29cd7e445adf1c5 (patch) | |
| tree | 60840d0882abb68b2827d8b04adfdf3e1ca6532d /drivers/virt | |
| parent | 4a530cb932af31b0c919a109bc107dd186653381 (diff) | |
virt: acrn: Annotate struct vm_memory_region_batch with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct vm_memory_region_batch.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Fei Li <fei1.li@intel.com>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175102.work.020-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'drivers/virt')
| -rw-r--r-- | drivers/virt/acrn/acrn_drv.h | 2 | ||||
| -rw-r--r-- | drivers/virt/acrn/mm.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/virt/acrn/acrn_drv.h b/drivers/virt/acrn/acrn_drv.h index 5663c17ad37c..fb8438094f6f 100644 --- a/drivers/virt/acrn/acrn_drv.h +++ b/drivers/virt/acrn/acrn_drv.h @@ -60,7 +60,7 @@ struct vm_memory_region_batch { u16 reserved[3]; u32 regions_num; u64 regions_gpa; - struct vm_memory_region_op regions_op[]; + struct vm_memory_region_op regions_op[] __counted_by(regions_num); }; /** diff --git a/drivers/virt/acrn/mm.c b/drivers/virt/acrn/mm.c index b4ad8d452e9a..fa5d9ca6be57 100644 --- a/drivers/virt/acrn/mm.c +++ b/drivers/virt/acrn/mm.c @@ -250,11 +250,11 @@ int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap) ret = -ENOMEM; goto unmap_kernel_map; } + regions_info->regions_num = nr_regions; /* Fill each vm_memory_region_op */ vm_region = regions_info->regions_op; regions_info->vmid = vm->vmid; - regions_info->regions_num = nr_regions; regions_info->regions_gpa = virt_to_phys(vm_region); user_vm_pa = memmap->user_vm_pa; i = 0; |