From e15c3098c6106d30f59615b5a2acd3becac94c9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89rico=20Rolim?= <erico.erc@gmail.com>
Date: Mon, 14 Dec 2020 10:47:59 -0300
Subject: [PATCH] libmilter: set explicit stack size.

Patch taken from alpine. libmilter stack overflows with musl's default
thread stack size.
---
 .../libmilter/patches/thread-stacksize.patch  | 42 +++++++++++++++++++
 srcpkgs/libmilter/template                    |  2 +-
 2 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 srcpkgs/libmilter/patches/thread-stacksize.patch

diff --git a/srcpkgs/libmilter/patches/thread-stacksize.patch b/srcpkgs/libmilter/patches/thread-stacksize.patch
new file mode 100644
index 00000000000..0881abdfd94
--- /dev/null
+++ b/srcpkgs/libmilter/patches/thread-stacksize.patch
@@ -0,0 +1,42 @@
+Set default pthread stack size to 256 KB
+
+This patch tries to fix various crashes for applications depending on libmilter
+by setting the stack size for pthreads to 256 KB. The default stack size for
+musl libc is set to 80 KB whereas glibc has it set to 8 MB. This causes problems
+when a large amount of memory is allocated on the stack.
+
+For example, opendkim allocates blocks of 64 KB multiple times, which causes
+libmilter (and therefore opendkim) to crash. For now, a stack size of 256 KB
+looks sufficient and makes opendkim stop crashing.
+
+Fixes https://bugs.alpinelinux.org/issues/6360
+
+--- libmilter/libmilter.h
++++ libmilter/libmilter.h
+@@ -127,10 +127,10 @@
+ # define MI_SOCK_READ(s, b, l)	read(s, b, l)
+ # define MI_SOCK_READ_FAIL(x)	((x) < 0)
+ # define MI_SOCK_WRITE(s, b, l)	write(s, b, l)
+-
+-# define thread_create(ptid,wr,arg) pthread_create(ptid, NULL, wr, arg)
+ # define sthread_get_id()	pthread_self()
+
++extern int thread_create(pthread_t *ptid, void *(*wr) (void *), void *arg);
++
+ typedef pthread_mutex_t smutex_t;
+ # define smutex_init(mp)	(pthread_mutex_init(mp, NULL) == 0)
+ # define smutex_destroy(mp)	(pthread_mutex_destroy(mp) == 0)
+--- libmilter/main.c
++++ libmilter/main.c
+@@ -16,6 +16,12 @@
+ #include <fcntl.h>
+ #include <sys/stat.h>
+
++int thread_create(pthread_t *ptid, void *(*wr) (void *), void *arg) {
++	pthread_attr_t attr;
++	pthread_attr_init(&attr);
++	pthread_attr_setstacksize(&attr,256*1024);
++	return pthread_create(ptid, &attr, wr, arg);
++}
+
+ static smfiDesc_ptr smfi = NULL;
diff --git a/srcpkgs/libmilter/template b/srcpkgs/libmilter/template
index b801ee3e5b9..0c4a3a84a54 100644
--- a/srcpkgs/libmilter/template
+++ b/srcpkgs/libmilter/template
@@ -1,7 +1,7 @@
 # Template file for 'libmilter'
 pkgname=libmilter
 version=1.0.2
-revision=3
+revision=4
 _pkgname=sendmail
 _version=8.15.2
 hostmakedepends="m4"