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Nicky f7e7903105 Fix ASAN errors from LLVector4a::memcpyNonAliased16 
Found by running with -fsanitze=thread
Suggestion to avoid accessing invalid memory:

In both cases memory will be allocated by can be accessed beyond bounds.

In LLPolyMesh it can be off by at least one (+x%2). Though I am not even sure if even in best case it always will be a multiple of 16.

In LLViewerJointMesh::updateFaceData the code tries to account for padding by, but the allocation in LLPolyMeshSharedData::allocateVertexData is done without any padding. Thus the sizes must not match.

Replacing the calls with memcpy as a quick fix to see if the error goes away fixed address sanitzer complaining.

It is up to debate if memcpy is a good replacement. LLVector4a::memcpyNonAliased16 was invented for performance. But on the other hand one could argue that nowadays every stdlib maintainer will very heavily optmize functions like memcpy themselves and could take advantage of CPU features the old LL implementation does not take into account.

AVX comes to mind. In any case did I not measure any of this.
 		2025-03-11 03:21:43 +02:00
.github Merge branch 'develop' into release/2024.12-ForeverFPS 2025-02-19 15:34:58 -05:00
doc secondlife/viewer#2483: Fix label typo in PBR terrain texture transforms tab 2024-09-03 10:10:32 -07:00
etc fixup tabs 2024-03-11 14:41:12 -07:00
indra Fix ASAN errors from LLVector4a::memcpyNonAliased16 2025-03-11 03:21:43 +02:00
scripts trailing spaces from other branches 2024-09-19 12:40:56 -04:00
.clang-format More changes to Clang-Format to match the current coding standard (#2375) 2024-08-21 19:46:49 +03:00
.editorconfig Add editorconfig 2024-05-01 08:23:35 -07:00
.git-blame-ignore-revs add some more whitespace commits to .git-blame-ignore-revs 2024-09-18 20:04:24 -07:00
.gitattributes Protect NSIS scripts from eol-style translations. (#1556) 2024-05-23 11:23:50 -07:00
.gitignore Merge branch 'main' into DRTVWR-489 2023-12-15 07:06:15 +02:00
.pre-commit-config.yaml Trim trailing whitespace 2024-05-29 08:10:00 -07:00
CONTRIBUTING.md Add a basic CONTRIBUTING.md 2024-01-26 23:58:47 -08:00
LICENSE
…
README.md Add a basic CONTRIBUTING.md 2024-01-26 23:58:47 -08:00
autobuild.xml Introduce OpenXR SDK prebuilt package and cmake setup (#2503) 2024-09-04 23:10:50 -04:00
build.sh remove dead code in build.sh 2024-09-19 12:02:57 -07:00
buildscripts_support_functions SL-18837: Get buildscripts_support_functions from sling-buildscripts 2023-06-28 16:58:32 -04:00

README.md

Second Life Logo

Second Life is a free 3D virtual world where users can create, connect and chat with others from around the world. This repository contains the source code for the official client.

Open Source

Second Life provides a huge variety of tools for expression, content creation, socialization and play. Its vibrancy is only possible because of input and contributions from its residents. The client codebase has been open source since 2007 and is available under the LGPL license. The Open Source Portal contains additional information about Linden Lab's open source history and projects.

Download

Most people use a pre-built viewer release to access Second Life. Windows and macOS builds are published on the official website. More experimental viewers, such as release candidates and project viewers, are detailed on the Alternate Viewers page.

Third Party Viewers

Third party maintained forks, which include Linux compatible builds, are indexed in the Third Party Viewer Directory.

Build Instructions

Windows

Mac

Linux

Contribute

Help make Second Life better! You can get involved with improvements by filing bugs, suggesting enhancements, submitting pull requests and more. See the CONTRIBUTING and the open source portal for details.