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syscall: add //go:norace to RawSyscall

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RawSyscall is used in a variety of rather unsafe conditions, such as
after fork in forkAndExecInChild1. Disable race instrumentation to avoid
calling TSAN in unsafe conditions.

For #51087

Change-Id: I47c35e6f0768c77ddab99010ea0404c45ad2f1da
Reviewed-on: https://go-review.googlesource.com/c/go/+/402914
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
This commit is contained in:
Michael Pratt 2022-04-28 11:44:28 -04:00 committed by Gopher Robot
parent 4d350710a2
commit 17371eea25
1 changed files with 4 additions and 0 deletions
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4
src/syscall/syscall_linux.go
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@ -46,11 +46,15 @@ func runtime_exitsyscall()
// uintptr arguments are pointers, because some values may look like pointers,
// but not really be pointers, and adjusting their value would break the call.
//
// //go:norace, on RawSyscall, to avoid race instrumentation if RawSyscall is
// called after fork, or from a signal handler.
//
// //go:linkname to ensure ABI wrappers are generated for external callers
// (notably x/sys/unix assembly).
//go:uintptrkeepalive
//go:nosplit
//go:norace
//go:linkname RawSyscall
func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
return RawSyscall6(trap, a1, a2, a3, 0, 0, 0)