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The Go programming language
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Jason A. Donenfeld ba42120723 runtime: properly compute whether PC is inside vDSO pages 
The old calculation just looked whether PC was within a page of a vDSO
symbol. This doesn't work because the vDSO .text might span two whole
pages, with trampolines and such redirecting PC around between them.

This manifests itself with the new vDSO getrandom() function, where on
PowerPC, the trampoline is quite far away from the actual C function it
jumps into. The effect is that the signal handler doesn't know it's
interrupting a vDSO call and forgets to restore g to R30, resulting in a
crash.

Fix this by storing the start and end of the LOAD section from the
program headers. We could be more specific and parse out the .text
section, but PT_LOAD is good enough and appears to work well.

Change-Id: I3cf16955177eedb51e28b3b1a0191b32c3327a42
Reviewed-on: https://go-review.googlesource.com/c/go/+/616015
Auto-Submit: Jason Donenfeld <Jason@zx2c4.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-09-26 16:51:09 +00:00
.github .github: update language change proposal template 2024-08-08 19:02:29 +00:00
api net,net/netip: implement the encoding.(Binary|Text)Appender 2024-09-23 18:10:51 +00:00
doc net,net/netip: implement the encoding.(Binary|Text)Appender 2024-09-23 18:10:51 +00:00
lib lib/time: update to 2024b/2024b 2024-09-23 14:25:08 +00:00
misc misc/wasm: move wasm runtime files to lib/wasm 2024-08-30 19:15:21 +00:00
src runtime: properly compute whether PC is inside vDSO pages 2024-09-26 16:51:09 +00:00
test reflect: remove calling mapiterkey, mapiterelem 2024-09-18 20:57:20 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 4.0 Attribution license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.