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Austin Clements 9f6df6c940 runtime: use 4 byte writes in amd64p32 memmove/memclr
Currently, amd64p32's memmove and memclr use 8 byte writes as much as
possible and 1 byte writes for the tail of the object. However, if an
object ends with a 4 byte pointer at an 8 byte aligned offset, this
may copy/zero the pointer field one byte at a time, allowing the
garbage collector to observe a partially copied pointer.

Fix this by using 4 byte writes instead of 8 byte writes.

Updates #12552.

Change-Id: I13324fd05756fb25ae57e812e836f0a975b5595c
Reviewed-on: https://go-review.googlesource.com/15370
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2015-10-02 22:49:15 +00:00
api api: update go1.5.txt 2015-07-30 21:14:09 +00:00
doc doc: add text/template blocks and redefinition to go1.6.txt 2015-09-28 23:55:27 +00:00
lib/time lib/time: update to IANA release 2015e. 2015-07-22 02:56:31 +00:00
misc misc/cgo/testsanitizers: skip test for version of clang before 3.6 2015-10-02 14:17:33 +00:00
src runtime: use 4 byte writes in amd64p32 memmove/memclr 2015-10-02 22:49:15 +00:00
test cmd/compile: repair escape analysis of range &fixedArray 2015-10-01 18:49:18 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore y.output 2015-06-10 00:28:52 +00:00
AUTHORS A+C: automated updates 2015-09-10 00:59:04 +00:00
CONTRIBUTING.md doc: suggest security@golang.org for reporting security issues 2015-06-26 09:53:36 +00:00
CONTRIBUTORS A+C: automated updates 2015-09-10 00:59:04 +00:00
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README.md readme: emphasize issue tracker is for bugs/proposals 2015-10-02 18:44:14 +00:00
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