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111 lines
2.3 KiB
111 lines
2.3 KiB
// Copyright 2016 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package unix |
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import ( |
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"errors" |
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"fmt" |
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"strconv" |
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) |
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// Pledge implements the pledge syscall. |
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// |
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// This changes both the promises and execpromises; use PledgePromises or |
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// PledgeExecpromises to only change the promises or execpromises |
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// respectively. |
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// |
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// For more information see pledge(2). |
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func Pledge(promises, execpromises string) error { |
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if err := pledgeAvailable(); err != nil { |
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return err |
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} |
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pptr, err := BytePtrFromString(promises) |
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if err != nil { |
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return err |
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} |
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exptr, err := BytePtrFromString(execpromises) |
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if err != nil { |
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return err |
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} |
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return pledge(pptr, exptr) |
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} |
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// PledgePromises implements the pledge syscall. |
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// |
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// This changes the promises and leaves the execpromises untouched. |
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// |
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// For more information see pledge(2). |
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func PledgePromises(promises string) error { |
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if err := pledgeAvailable(); err != nil { |
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return err |
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} |
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pptr, err := BytePtrFromString(promises) |
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if err != nil { |
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return err |
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} |
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return pledge(pptr, nil) |
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} |
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// PledgeExecpromises implements the pledge syscall. |
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// |
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// This changes the execpromises and leaves the promises untouched. |
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// |
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// For more information see pledge(2). |
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func PledgeExecpromises(execpromises string) error { |
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if err := pledgeAvailable(); err != nil { |
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return err |
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} |
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exptr, err := BytePtrFromString(execpromises) |
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if err != nil { |
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return err |
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} |
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return pledge(nil, exptr) |
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} |
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// majmin returns major and minor version number for an OpenBSD system. |
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func majmin() (major int, minor int, err error) { |
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var v Utsname |
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err = Uname(&v) |
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if err != nil { |
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return |
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} |
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major, err = strconv.Atoi(string(v.Release[0])) |
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if err != nil { |
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err = errors.New("cannot parse major version number returned by uname") |
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return |
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} |
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minor, err = strconv.Atoi(string(v.Release[2])) |
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if err != nil { |
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err = errors.New("cannot parse minor version number returned by uname") |
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return |
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} |
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return |
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} |
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// pledgeAvailable checks for availability of the pledge(2) syscall |
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// based on the running OpenBSD version. |
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func pledgeAvailable() error { |
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maj, min, err := majmin() |
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if err != nil { |
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return err |
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} |
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// Require OpenBSD 6.4 as a minimum. |
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if maj < 6 || (maj == 6 && min <= 3) { |
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return fmt.Errorf("cannot call Pledge on OpenBSD %d.%d", maj, min) |
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} |
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return nil |
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}
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