diff options
| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2023-10-09 12:24:27 -0600 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-10-16 09:37:31 +0200 |
| commit | 9e13ec61de2a51195b122a79461431d8cb99d7b5 (patch) | |
| tree | 2b22f00a73489d5b278e8c69a162db70b55005e1 | |
| parent | 6465e260f48790807eef06b583b38ca9789b6072 (diff) | |
iommu/virtio: Add __counted_by for struct viommu_request and use struct_size()
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 via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
While there, use struct_size() helper, instead of the open-coded
version, to calculate the size for the allocation of the whole
flexible structure, including of course, the flexible-array member.
This code was found with the help of Coccinelle, and audited and
fixed manually.
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/ZSRFW0yDlDo8+at3@work
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/virtio-iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 17dcd826f5c2..379ebe03efb6 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -85,7 +85,7 @@ struct viommu_request { void *writeback; unsigned int write_offset; unsigned int len; - char buf[]; + char buf[] __counted_by(len); }; #define VIOMMU_FAULT_RESV_MASK 0xffffff00 @@ -230,7 +230,7 @@ static int __viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len, if (write_offset <= 0) return -EINVAL; - req = kzalloc(sizeof(*req) + len, GFP_ATOMIC); + req = kzalloc(struct_size(req, buf, len), GFP_ATOMIC); if (!req) return -ENOMEM; |