musl: backport patch to fix #37382

srcpkgs/musl/patches/avoid-set-id-setrlimit-misbehavior-and-hang-in-vfork.patch

@@ -0,0 +1,49 @@
+From a5aff1972c9e3981566414b09a28e331ccd2be5d Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Thu, 17 Sep 2020 15:09:46 -0400
+Subject: [PATCH 237/513] avoid set*id/setrlimit misbehavior and hang in
+ vforked/cloned child
+
+taking the deprecated/dropped vfork spec strictly, doing pretty much
+anything but execve in the child is wrong and undefined. however,
+these are commonly needed operations to setup the child state before
+exec, and historical implementations tolerated them.
+
+for single-threaded parents, these operations already worked as
+expected in the vforked child. however, due to the need for __synccall
+to synchronize id/resource limit changes among all threads, calling
+these functions in the vforked child of a multithreaded parent caused
+a misdirected broadcast signaling of all threads in the parent. these
+signals could kill the parent entirely if the synccall signal handler
+had never been installed in the parent, or could be ignored if it had,
+or could signal/kill one or more utterly wrong processes if the parent
+already terminated (due to vfork semantics, only possible via fatal
+signal) and the parent tids were recycled. in any case, the expected
+number of semaphore posts would never happen, so the child would
+permanently hang (with all signals blocked) waiting for them.
+
+to mitigate this, and also make the normal usage case work as
+intended, treat the condition where the caller's actual tid does not
+match the tid in its thread structure as single-threaded, and bypass
+the entire synccall broadcast operation.
+---
+ src/thread/synccall.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/thread/synccall.c b/src/thread/synccall.c
+index 648a6ad4..d58c851f 100644
+--- a/src/thread/synccall.c
++++ b/src/thread/synccall.c
+@@ -63,7 +63,8 @@ void __synccall(void (*func)(void *), void *ctx)
+ 	sem_init(&target_sem, 0, 0);
+ 	sem_init(&caller_sem, 0, 0);
+
+-	if (!libc.threads_minus_1) goto single_threaded;
++	if (!libc.threads_minus_1 || __syscall(SYS_gettid) != self->tid)
++		goto single_threaded;
+
+ 	callback = func;
+ 	context = ctx;
+-- 
+2.41.0
+

srcpkgs/musl/template

@@ -2,7 +2,7 @@
 pkgname=musl
 reverts="1.2.0_1"
 version=1.1.24
-revision=16
+revision=17
 archs="*-musl"
 bootstrap=yes
 build_style=gnu-configure