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Cygwin: setpriority, sched_setparam: add missing process access right

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set_and_check_winprio() also requires PROCESS_QUERY_LIMITED_INFORMATION.
Also add an early check for this access right to set_and_check_winprio().

Fixes: 153b51ee08ef ("Cygwin: setpriority, sched_setparam: fail if Windows sets a lower priority")
Signed-off-by: Christian Franke <christian.franke@t-online.de>
This commit is contained in:
Christian Franke 2024-12-02 17:07:18 +01:00 committed by Corinna Vinschen
parent b99742712e
commit a82bf55908
3 changed files with 8 additions and 3 deletions
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2
winsup/cygwin/miscfuncs.cc
View File

@ -190,6 +190,8 @@ bool
set_and_check_winprio (HANDLE proc, DWORD prio)
{
DWORD prev_prio = GetPriorityClass (proc);
if (!prev_prio)
return false;
if (prev_prio == prio)
return true;

4
winsup/cygwin/sched.cc
View File

@ -260,7 +260,9 @@ sched_setparam (pid_t pid, const struct sched_param *param)
set_errno (ESRCH);
return -1;
}
process = OpenProcess (PROCESS_SET_INFORMATION, FALSE, p->dwProcessId);
process = OpenProcess (PROCESS_SET_INFORMATION |
PROCESS_QUERY_LIMITED_INFORMATION,
FALSE, p->dwProcessId);
if (!process)
{
set_errno (ESRCH);

5
winsup/cygwin/syscalls.cc
View File

@ -3869,8 +3869,9 @@ setpriority (int which, id_t who, int value)
continue;
break;
}
HANDLE proc_h = OpenProcess (PROCESS_SET_INFORMATION, FALSE,
p->dwProcessId);
HANDLE proc_h = OpenProcess (PROCESS_SET_INFORMATION |
PROCESS_QUERY_LIMITED_INFORMATION,
FALSE, p->dwProcessId);
if (!proc_h)
error = EPERM;
else