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os: enable the close-on-exec flag for openFdAt

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There's a race here with fork/exec, enable the close-on-exec flag
for the new file descriptor.

Fixes #33405

Change-Id: If95bae97a52b7026a930bb3427e47bae3b0032ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/188537
Run-TryBot: Baokun Lee <nototon@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Baokun Lee 2019-08-02 00:31:57 +08:00 committed by Ian Lance Taylor
parent e7c51cad71
commit 2d6ee6e89a
1 changed files with 1 additions and 1 deletions
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2
src/os/removeall_at.go
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@ -173,7 +173,7 @@ func openFdAt(dirfd int, name string) (*File, error) {
var r int
for {
var e error
r, e = unix.Openat(dirfd, name, O_RDONLY, 0)
r, e = unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC, 0)
if e == nil {
break
}