go, branch go1.15.6

[release-branch.go1.15] go1.15.6

2020-12-03T17:27:17Z

Change-Id: I9e050e1463f1bc01c04d1817aef2f81a5aac4d42 Reviewed-on: https://go-review.googlesource.com/c/go/+/275132 Run-TryBot: Carlos Amedee TryBot-Result: Go Bot Reviewed-by: Dmitri Shuralyov Trust: Carlos Amedee

[release-branch.go1.15] cmd/link: recompute heapPos after copyHeap

2020-12-03T14:06:12Z

Immediately after a forward Seek, the offset we're writing to is beyond len(buf)+len(heap): |<--- buf --->|<--- heap --->| ^ off If we do a copyHeap at this point, the new heapPos should not be 0: |<---------- buf ----------->|<-heap->| ^ off Recompute it. Updates #42082 Fixes #42948 Change-Id: Icb3e4e1c7bf7d1fd3d76a2e0d7dfcb319c661534 Reviewed-on: https://go-review.googlesource.com/c/go/+/270942 Run-TryBot: Carlos Amedee TryBot-Result: Go Bot Reviewed-by: Than McIntosh Reviewed-by: Jeremy Faller Trust: Cherry Zhang

[release-branch.go1.15] cmd/compile: sign extend consant folding properly

2020-12-03T13:58:28Z

MOVLconst must have a properly sign-extended auxint constant. The bit operations in these rules don't enforce that invariant. The easiest fix is just to turn on properly typed auxint fields (which is what fixed this issue at tip). Fixes #42753 Change-Id: I264245fad45067a6ade65326f7fe681feb5f3739 Reviewed-on: https://go-review.googlesource.com/c/go/+/272028 Trust: Keith Randall Run-TryBot: Keith Randall TryBot-Result: Go Bot Reviewed-by: David Chase

[release-branch.go1.15] cmd/compile: do not emit an extra debug_line entry for the end of seq addr

2020-11-23T19:42:26Z

Uses DW_LNS_advance_pc directly, instead of calling putpclcdelta because the latter will create a new debug_line entry for the end of sequence address. Updates #42484. Fixes #42521. Change-Id: Ib6355605cac101b9bf37a3b4961ab0cee678a839 Reviewed-on: https://go-review.googlesource.com/c/go/+/268937 Trust: Than McIntosh Run-TryBot: Than McIntosh TryBot-Result: Go Bot Reviewed-by: Than McIntosh Reviewed-by: Cherry Zhang Reviewed-on: https://go-review.googlesource.com/c/go/+/269517

[release-branch.go1.15] internal/poll: use copy_file_range only on Linux kernel >= 5.3

2020-11-20T21:54:27Z

https://man7.org/linux/man-pages/man2/copy_file_range.2.html#VERSIONS states: A major rework of the kernel implementation occurred in 5.3. Areas of the API that weren't clearly defined were clarified and the API bounds are much more strictly checked than on earlier kernels. Applications should target the behaviour and requirements of 5.3 kernels. Rather than attempting to detect the file system for source and destination files (which means two additional statfs syscalls) and skip copy_file_range in case of known defects (e.g. CIFS -> CIFS), just assume copy_file_range to be broken on kernels < 5.3. Fixes #42550 Change-Id: I3a531296182c1d6e341772cc9d2be5bf83e52575 Reviewed-on: https://go-review.googlesource.com/c/go/+/268338 Trust: Tobias Klauser Run-TryBot: Tobias Klauser TryBot-Result: Go Bot Reviewed-by: Ian Lance Taylor (cherry picked from commit 1c7650aa93bd53b7df0bbb34693fc5a16d9f67af) Reviewed-on: https://go-review.googlesource.com/c/go/+/269759 Trust: Ian Lance Taylor Run-TryBot: Ian Lance Taylor Reviewed-by: Dmitri Shuralyov

[release-branch.go1.15] runtime: block signals in needm before allocating M

2020-11-20T20:38:12Z

Otherwise, if a signal occurs just after we allocated the M, we can deadlock if the signal handler needs to allocate an M itself. For #42207 Fixes #42636 Change-Id: I76f44547f419e8b1c14cbf49bf602c6e645d8c14 Reviewed-on: https://go-review.googlesource.com/c/go/+/265759 Trust: Ian Lance Taylor Run-TryBot: Ian Lance Taylor TryBot-Result: Go Bot Reviewed-by: Bryan C. Mills (cherry picked from commit 368c40116434532dc0b53b72fa04788ca6742898) Reviewed-on: https://go-review.googlesource.com/c/go/+/271847

[release-branch.go1.15] cmd/go: permit CGO_LDFLAGS to appear in //go:ldflag

2020-11-16T14:56:38Z

For #42565 Fixes #42567 Change-Id: If7cf39905d124dbd54dfac6a53ee38270498efed Reviewed-on: https://go-review.googlesource.com/c/go/+/269818 Trust: Ian Lance Taylor Run-TryBot: Ian Lance Taylor TryBot-Result: Go Bot Reviewed-by: Jay Conrod (cherry picked from commit 782cf560db4c919790fdb476d1bbe18e5ddf5ffd) Reviewed-on: https://go-review.googlesource.com/c/go/+/270137

[release-branch.go1.15] all: merge release-branch.go1.15-security into release-branch.go1.15

2020-11-12T20:49:20Z

Change-Id: I5690e7f4f7f04b9df1881fa60f3d3c6841cefe40

[release-branch.go1.15-security] go1.15.5

2020-11-12T16:39:58Z

Change-Id: Id3b116c0f54c2131111bc8afacb8d81d06f96461 Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/901407 Reviewed-by: Katie Hockman

[release-branch.go1.15-security] math/big: fix shift for recursive division

2020-11-11T23:35:42Z

The previous s value could cause a crash for certain inputs. Will check in tests and documentation improvements later. Thanks to the Go Ethereum team and the OSS-Fuzz project for reporting this. Thanks to Rémy Oudompheng and Robert Griesemer for their help developing and validating the fix. Fixes CVE-2020-28362 Change-Id: Ibbf455c4436bcdb07c84a34fa6551fb3422356d3 Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/899974 Reviewed-by: Roland Shoemaker Reviewed-by: Filippo Valsorda (cherry picked from commit 28015462c2a83239543dc2bef651e9a5f234b633) Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/901065