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GGitHub[lldb] Fix a use-after-free in SymbolFileCTF (#151586)

e1d45b1b创建于 2025年8月1日历史提交

文件	最后提交记录	最后更新时间
CMakeLists.txt	[lldb] Support Compact C Type Format (CTF) Add support for the Compact C Type Format (CTF) in LLDB. The format describes the layout and sizes of C types. It is most commonly consumed by dtrace. We generate CTF for the XNU kernel and want to be able to use this in LLDB to debug kernels for which we don't have dSYMs (anymore). CTF is a much more limited debug format than DWARF which allows is to be an order of magnitude smaller: a 1GB dSYM can be converted to a handful of megabytes of CTF. For XNU, the goal is not to replace DWARF, but rather to have CTF serve as a "better than nothing" debug info format when DWARF is not available. It's worth noting that the LLVM toolchain does not support emitting CTF. XNU uses ctfconvert to generate CTF from DWARF which is used for testing. Differential revision: https://reviews.llvm.org/D154862	3 年前
CTFTypes.h	[lldb] Improve memory usage by freeing CTF types (NFC) Improve memory usage by reducing the lifetime of CTF types. Once a CTF type has been converted to a (complete) LLDB type, there's no need to keep it in memory anymore. For most types, we can free them right after creating the corresponding LLDB types. The only exception is record types, which are only completed lazily. Differential revision: https://reviews.llvm.org/D156606	2 年前
SymbolFileCTF.cpp	[lldb] Fix a use-after-free in SymbolFileCTF (#151586) This fixes a use-after-free in SymbolFileCTF. Previously, we would remove the underlying CTF type as soon as we resolved it. However, it's possible that we're still holding onto the CTF type while we're parsing a dependent type, like a modifier, resulting in a use-after-free. This patch addresses the issue by delaying the removal of the CTF type until the type is fully resolved. I have a XNU kernel binary that reproduces the issue and confirmed that this solves the memory issue using ASan. However I haven't been able to craft types by hand that reproduce this issue for a test case. rdar://156660866	1 年前
SymbolFileCTF.h	Add support for inline DWARF source files. (#75880) LLVM supports DWARF 5 linetable extension to store source files inline in DWARF. This is particularly useful for compiler-generated source code. This implementation tries to materialize them as temporary files lazily, so SBAPI clients don't need to be aware of them. rdar://110926168	2 年前