https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0275a36723dd4552a26880e4ac8ba9b6dc41b17f
commit 0275a36723dd4552a26880e4ac8ba9b6dc41b17f Author: Christian Franke <[email protected]> Date: Sat Mar 8 14:05:20 2025 +0100 Cygwin: sched_setaffinity: fix EACCES if pid of other process is used GetProcessGroupAffinity() requires PROCESS_QUERY_LIMITED_INFORMATION. Fixes: 641ecb07533e ("Cygwin: Implement sched_[gs]etaffinity()") Signed-off-by: Christian Franke <[email protected]> Diff: --- winsup/cygwin/release/3.6.0 | 2 ++ winsup/cygwin/sched.cc | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/winsup/cygwin/release/3.6.0 b/winsup/cygwin/release/3.6.0 index 8225f2ccc..4c953a84d 100644 --- a/winsup/cygwin/release/3.6.0 +++ b/winsup/cygwin/release/3.6.0 @@ -126,3 +126,5 @@ Fixes: - Fix 'lost connection' error in scp. Addresses: https://cygwin.com/pipermail/cygwin/2025-January/257143.html + +- Fix EACCES error of sched_setaffinity(2) if pid of other process is used. diff --git a/winsup/cygwin/sched.cc b/winsup/cygwin/sched.cc index 86941b2ac..2f4fbc31a 100644 --- a/winsup/cygwin/sched.cc +++ b/winsup/cygwin/sched.cc @@ -661,7 +661,8 @@ sched_setaffinity (pid_t pid, size_t sizeof_set, const cpu_set_t *set) if (p) { process = pid && pid != myself->pid ? - OpenProcess (PROCESS_SET_INFORMATION, FALSE, + OpenProcess (PROCESS_SET_INFORMATION | + PROCESS_QUERY_LIMITED_INFORMATION, FALSE, p->dwProcessId) : GetCurrentProcess (); if (!GetProcessGroupAffinity (process, &groupcount, grouparray)) {
