Validate texture copy ranges earlier to prevent integer overflow #3090
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nical
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cwfitzgerald
requested changes
Oct 12, 2022
validate_texture_copy_range has a number of important checks on sizes that we want to make as early as possible to prevent integer overflows in other places such as transfer::extract_texture_selector which computes copy_texture.origin.z + copy_size.depth_or_array_layers (overflow found by fuzzers as always). The fix is to call validate_texture_copy_range earlier, in particular before extract_texture_selector. Unfortunately it led to more code churn than I would have liked. Thankfully it is mechanical and simple: Rather than getting the texture reference from Tracker::set_single, we grab it earlier (for validation) and pass it to set_single instead of the texture guard. As a bonus we are looking texture texture up less often than we used to.
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Codecov Report
@@ Coverage Diff @@
## master #3090 +/- ##
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- Coverage 65.41% 47.14% -18.27%
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Files 82 82
Lines 39455 39436 -19
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- Hits 25809 18592 -7217
- Misses 13646 20844 +7198
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cwfitzgerald
approved these changes
Dec 1, 2022
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Checklist
cargo clippy.Connections
https://bugzilla.mozilla.org/show_bug.cgi?id=1791806
Description
validate_texture_copy_rangehas a number of important checks on sizes that we want to make as early as possible to prevent integer overflows in other places such astransfer::extract_texture_selectorwhich computescopy_texture.origin.z + copy_size.depth_or_array_layers(overflow found by a fuzzer, as always).The fix is to call validate_texture_copy_range earlier, in particular before extract_texture_selector.
Unfortunately it led to more code churn than I would have liked. Thankfully it is mechanical and simple: Rather than getting the texture reference from
Tracker::set_single, we grab it earlier (for validation) and pass it toset_singleinstead of the texture guard.As a bonus we are looking texture texture up less often than we used to, and we do all of the validation before starting to transition some states which sounds safer to me.
Testing
I did actually add a test this time around!