commit | 0dc7ef1ed506749c5813776e320916579da9c9fa | [log] [tgz] |
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author | Derek Bruening <bruening@google.com> | Fri Jul 16 01:38:22 2021 |
committer | GitHub <noreply@github.com> | Fri Jul 16 01:38:22 2021 |
tree | 3b13eda3fd21c90f4f6a4ac2f2f87d05485685f2 | |
parent | 53d5244f1be5bf7e4fbe393d4f53d0116c831aff [diff] |
i#4998: Fix incorrectly nested signals (#5008) Fixes a bug where DR delivers a signal while an app is inside its signal handler for that same signal and has blocked such self-nesting. The fix is to undo some of the sigsuspend-handling changes that cause this regression by moving the sigsuspend state restore to actual delivery rather than at pending signal time. The ignoring of the current blocked signal set does have to remain in some form to handle pselect and signals like it where we can't move the post-syscall action to after the signal delivery. Improves the linux.signest test to reproduce the original bug and verify the fix. Also adds a test case to ensure that signals are nested when not blocked. Fixes #4998
DynamoRIO is a runtime code manipulation system that supports code transformations on any part of a program, while it executes. DynamoRIO exports an interface for building dynamic tools for a wide variety of uses: program analysis and understanding, profiling, instrumentation, optimization, translation, etc. Unlike many dynamic tool systems, DynamoRIO is not limited to insertion of callouts/trampolines and allows arbitrary modifications to application instructions via a powerful IA-32/AMD64/ARM/AArch64 instruction manipulation library. DynamoRIO provides efficient, transparent, and comprehensive manipulation of unmodified applications running on stock operating systems (Windows, Linux, or Android) and commodity IA-32, AMD64, ARM, and AArch64 hardware. Mac OSX support is in progress.
DynamoRIO is the basis for some well-known external tools:
Tools built on DynamoRIO and available in the release package include:
DynamoRIO‘s powerful API abstracts away the details of the underlying infrastructure and allows the tool builder to concentrate on analyzing or modifying the application’s runtime code stream. API documentation is included in the release package and can also be browsed online. Slides from our past tutorials are also available.
DynamoRIO is available free of charge as a binary package for both Windows and Linux. DynamoRIO's source code is available primarily under a BSD license.
Use the discussion list to ask questions.
To report a bug, use the issue tracker.
See also the DynamoRIO home page: http://dynamorio.org/