https://bugs.kde.org/show_bug.cgi?id=480296
Bug ID: 480296
Summary: UB in plasma-workspace's ksmserver/legacy.cpp
(-Wrestrict with ::select)
Classification: Plasma
Product: plasmashell
Version: master
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: s...@gentoo.org
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
SUMMARY
See
https://invent.kde.org/plasma/plasma-workspace/-/blob/034205dd9dc667f6abcf8fb8a53baa6094bb4449/ksmserver/legacy.cpp#L179
where ::select is called as:
>::select(fd + 1, &fds, nullptr, &fds, &tmwait);
This triggers a warning
```
*
/var/tmp/portage/kde-plasma/plasma-workspace-6.0.49.9999/work/plasma-workspace-6.0.49.9999/ksmserver/legacy.cpp:179:30:
warning: passing argument 2 to ‘restrict’-qualified parameter aliases with
argument 4 [-Wrestrict]
```
with gcc version 14.0.1 20240121 (experimental) (Gentoo Hardened
14.0.1_pre20240121 p16) at least, and it looks right.
>From `select(3p`):
```
int select(int nfds, fd_set *restrict readfds,
fd_set *restrict writefds, fd_set *restrict errorfds,
struct timeval *restrict timeout);
```
&fds is passed as both `readfds` and `errorfds` which is forbidden.
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