0001187: sigaltstack ss->ss_flags cannot contain extension flags

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Category

Severity

Type

Date Submitted

Last Update

0001187

[1003.1(2016)/Issue7+TC2] System Interfaces

Editorial

Enhancement Request

2018-02-07 00:48

Reporter

nsz

View Status

public

Assigned To

Priority

normal

Resolution

Open

Status

New

Name

Szabolcs Nagy

Organization

musl libc

User Reference

Section

sigaltstack

Page Number

Line Number

Interp Status

---

Final Accepted Text

Summary

0001187: sigaltstack ss->ss_flags cannot contain extension flags

Description

The way sigaltstack is specified currently, the caller can only set
ss->ss_flags to SS_DISABLE or 0, other values shall fail with EINVAL.

This makes extensions, such as SS_AUTODISARM on linux, non-conforming
http://man7.org/linux/man-pages/man2/sigaltstack.2.html [^]
even though posix usually allows such extension flags with implementation
defined behaviour so it is easy to add new features.

Desired Action

allow other flags than SS_DISABLE, e.g. change

The sigaltstack() function shall fail if:

    [EINVAL]
        The ss argument is not a null pointer, and the ss_flags member pointed to by ss contains flags other than SS_DISABLE.

to

The sigaltstack() function shall fail if:

    [EINVAL]
        The ss argument is not a null pointer, and the ss_flags member pointed to by ss has SS_ONSTACK or invalid flags set.

or just change "shall" to "may".

Issue History
Date Modified	Username	Field	Change
2018-02-07 00:48	nsz	New Issue
2018-02-07 00:48	nsz	Name	=> Szabolcs Nagy
2018-02-07 00:48	nsz	Organization	=> musl libc
2018-02-07 00:48	nsz	Section	=> sigaltstack

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