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runtime: improve asanread/asanwrite nosplit comment

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Explain the conditions under which they are called on stacks that
cannot grow.

Change-Id: I08ee5480face7fbedeccc09e55b8149c5a793c2e
Reviewed-on: https://go-review.googlesource.com/c/go/+/376036
Trust: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Fannie Zhang <Fannie.Zhang@arm.com>
This commit is contained in:
Austin Clements 2022-01-06 15:25:01 -05:00
parent c7fa66179b
commit 1cc3c73580
1 changed files with 3 additions and 2 deletions
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5
src/runtime/asan.go
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@ -26,8 +26,9 @@ func ASanWrite(addr unsafe.Pointer, len int) {
// Private interface for the runtime.
const asanenabled = true
// Mark asan(read, write) as NOSPLIT, because they may run
// on stacks that cannot grow. See issue #50391.
// asan{read,write} are nosplit because they may be called between
// fork and exec, when the stack must not grow. See issue #50391.
//go:nosplit
func asanread(addr unsafe.Pointer, sz uintptr) {
sp := getcallersp()