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Michael Anthony Knyszek 2e455ec2eb runtime: avoid overflow from linearAlloc 
Currently linearAlloc manages an exclusive "end" address for the top of
its reserved space. While unlikely for a linearAlloc to be allocated
with an "end" address hitting the top of the address space, it is
possible and could lead to overflow.

Avoid overflow by chopping off the last byte from the linearAlloc if
it's bumping up against the top of the address space defensively. In
practice, this means that if 32-bit platforms map the top of the address
space and use the linearAlloc to acquire arenas, the top arena will not
be usable.

Fixes #35954.

Change-Id: I512cddcd34fd1ab15cb6ca92bbf899fc1ef22ff6
Reviewed-on: https://go-review.googlesource.com/c/go/+/231338
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
 		2020-05-07 21:40:09 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api all: remove scattered remnants of darwin/386 2020-04-08 18:37:38 +00:00
doc syscall: if Setctty, require that Ctty be a child descriptor 2020-05-01 21:57:29 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc cmd/cgo: use type aliases for #define type macros 2020-05-01 18:01:28 +00:00
src runtime: avoid overflow from linearAlloc 2020-05-07 21:40:09 +00:00
test cmd/compile: optimize make+copy pattern to avoid memclr 2020-05-07 17:50:24 +00:00
.gitattributes build: force all Windows batch files to CRLF 2020-03-22 08:42:38 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add Alexey Semenyuk (individual CLA) 2020-05-01 19:36:54 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Alexey Semenyuk (individual CLA) 2020-05-01 19:36:54 +00:00
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +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.

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