main/musl: fix popen/posix_spawn under qemu-user emulation

cherry-pick upstream commit working around the qemu-user deficiency.

11 files changed, 93 insertions, 39 deletions

diff --git a/main/musl/0001-fix-Makefile-so-make-install-works-before-include-bi.patch b/main/musl/0001-fix-Makefile-so-make-install-works-before-include-bi.patch
index 42d5be18bb..c34d8c31d5 100644
--- a/main/musl/0001-fix-Makefile-so-make-install-works-before-include-bi.patch
+++ b/main/musl/0001-fix-Makefile-so-make-install-works-before-include-bi.patch
@@ -1,8 +1,8 @@
 From 997d58d8052fb9f8374afd2fb456785f53217f50 Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Mon, 1 Jul 2013 13:43:43 -0400
-Subject: [PATCH 1/9] fix Makefile so "make install" works before include/bits
- symlink exists
+Subject: [PATCH 01/10] fix Makefile so "make install" works before
+ include/bits symlink exists
 
 previously, determination of the list of header files for installation
 depended on the include/bits symlink (to the arch-specific files)
diff --git a/main/musl/0002-add-stubs-for-additional-legacy-ether.h-functions.patch b/main/musl/0002-add-stubs-for-additional-legacy-ether.h-functions.patch
index fb25c9ae11..42a78e15c5 100644
--- a/main/musl/0002-add-stubs-for-additional-legacy-ether.h-functions.patch
+++ b/main/musl/0002-add-stubs-for-additional-legacy-ether.h-functions.patch
@@ -1,7 +1,7 @@
 From 6e31b284fe98686f8a763de775a087da3be05024 Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Mon, 1 Jul 2013 13:50:02 -0400
-Subject: [PATCH 2/9] add stubs for additional legacy ether.h functions
+Subject: [PATCH 02/10] add stubs for additional legacy ether.h functions
 
 these would not be expensive to actually implement, but reading
 /etc/ethers does not sound like a particularly useful feature, so for
diff --git a/main/musl/0003-add-legacy-scsi-scsi_ioctl.h-header.patch b/main/musl/0003-add-legacy-scsi-scsi_ioctl.h-header.patch
index fe67990a45..0904f610c8 100644
--- a/main/musl/0003-add-legacy-scsi-scsi_ioctl.h-header.patch
+++ b/main/musl/0003-add-legacy-scsi-scsi_ioctl.h-header.patch
@@ -1,7 +1,7 @@
 From 5ece469f37e5cdddb86871b56f4f74674690fbe4 Mon Sep 17 00:00:00 2001
 From: rofl0r <retnyg@gmx.net>
 Date: Wed, 3 Jul 2013 17:52:44 +0200
-Subject: [PATCH 3/9] add legacy scsi/scsi_ioctl.h header
+Subject: [PATCH 03/10] add legacy scsi/scsi_ioctl.h header
 
 ---
  include/scsi/scsi_ioctl.h | 11 +++++++++++
diff --git a/main/musl/0004-add-legacy-sys-ttydefaults.h-header.patch b/main/musl/0004-add-legacy-sys-ttydefaults.h-header.patch
index e5d6f2cea4..e05106d72a 100644
--- a/main/musl/0004-add-legacy-sys-ttydefaults.h-header.patch
+++ b/main/musl/0004-add-legacy-sys-ttydefaults.h-header.patch
@@ -1,7 +1,7 @@
 From 129a34db6328cb13fec4d5f2d2703cb7922e8634 Mon Sep 17 00:00:00 2001
 From: rofl0r <retnyg@gmx.net>
 Date: Wed, 3 Jul 2013 17:55:37 +0200
-Subject: [PATCH 4/9] add legacy sys/ttydefaults.h header
+Subject: [PATCH 04/10] add legacy sys/ttydefaults.h header
 
 ---
  include/sys/ttydefaults.h | 39 +++++++++++++++++++++++++++++++++++++++
diff --git a/main/musl/0005-add-NFDBITS-in-sys-select.h-with-appropriate-feature.patch b/main/musl/0005-add-NFDBITS-in-sys-select.h-with-appropriate-feature.patch
index 3738bc5620..caf5ea390c 100644
--- a/main/musl/0005-add-NFDBITS-in-sys-select.h-with-appropriate-feature.patch
+++ b/main/musl/0005-add-NFDBITS-in-sys-select.h-with-appropriate-feature.patch
@@ -1,7 +1,7 @@
 From 9b9dc74b67b9ecd30db9f3266a5ce309b0ffbfef Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Sat, 6 Jul 2013 01:12:28 -0400
-Subject: [PATCH 5/9] add NFDBITS in sys/select.h with appropriate feature
+Subject: [PATCH 05/10] add NFDBITS in sys/select.h with appropriate feature
  tests
 
 the main use for this macro seems to be knowing the correct allocation
diff --git a/main/musl/0006-fix-off-by-one-array-bound-in-strsignal.patch b/main/musl/0006-fix-off-by-one-array-bound-in-strsignal.patch
index e349d3b29b..e5acb992d6 100644
--- a/main/musl/0006-fix-off-by-one-array-bound-in-strsignal.patch
+++ b/main/musl/0006-fix-off-by-one-array-bound-in-strsignal.patch
@@ -1,7 +1,7 @@
 From 9134a8ca79fa9c79eada278b10f4d6b1eaf271d3 Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Tue, 9 Jul 2013 02:11:52 -0400
-Subject: [PATCH 6/9] fix off-by-one array bound in strsignal
+Subject: [PATCH 06/10] fix off-by-one array bound in strsignal
 
 ---
  src/string/strsignal.c | 2 +-
diff --git a/main/musl/0007-fix-invalid-library-phdr-pointers-passed-to-callback.patch b/main/musl/0007-fix-invalid-library-phdr-pointers-passed-to-callback.patch
index 1ebc977479..39049963ca 100644
--- a/main/musl/0007-fix-invalid-library-phdr-pointers-passed-to-callback.patch
+++ b/main/musl/0007-fix-invalid-library-phdr-pointers-passed-to-callback.patch
@@ -1,8 +1,8 @@
 From 0ccea50c697512b4bcbe76780260dfba09450327 Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Wed, 10 Jul 2013 14:38:20 -0400
-Subject: [PATCH 7/9] fix invalid library phdr pointers passed to callback from
- dl_iterate_phdr
+Subject: [PATCH 07/10] fix invalid library phdr pointers passed to callback
+ from dl_iterate_phdr
 
 map_library was saving pointers to an automatic-storage buffer rather
 than pointers into the mapping. this should be a fairly simple fix,
diff --git a/main/musl/0008-add-some-ARM-EABI-specific-exception-handling-infras.patch b/main/musl/0008-add-some-ARM-EABI-specific-exception-handling-infras.patch
index 56b09d7cf2..85557f2f6d 100644
--- a/main/musl/0008-add-some-ARM-EABI-specific-exception-handling-infras.patch
+++ b/main/musl/0008-add-some-ARM-EABI-specific-exception-handling-infras.patch
@@ -1,7 +1,7 @@
 From f39afb9ffb34b747bfc1ec9d77b239c0c32a754d Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Wed, 10 Jul 2013 16:11:01 -0400
-Subject: [PATCH 8/9] add some ARM EABI-specific exception handling
+Subject: [PATCH 08/10] add some ARM EABI-specific exception handling
  infrastructure
 MIME-Version: 1.0
 Content-Type: text/plain; charset=UTF-8
diff --git a/main/musl/0009-add-PIE-support-for-ARM.patch b/main/musl/0009-add-PIE-support-for-ARM.patch
index 3ced0277a9..17035464ec 100644
--- a/main/musl/0009-add-PIE-support-for-ARM.patch
+++ b/main/musl/0009-add-PIE-support-for-ARM.patch
@@ -1,7 +1,7 @@
 From 84934ac8bcebb41ffca1703d97512682069c68ec Mon Sep 17 00:00:00 2001
 From: Rich Felker <dalias@aerifal.cx>
 Date: Wed, 10 Jul 2013 16:58:27 -0400
-Subject: [PATCH 9/9] add PIE support for ARM
+Subject: [PATCH 09/10] add PIE support for ARM
 
 ---
  crt/arm/Scrt1.s | 30 ++++++++++++++++++++++++++++++
diff --git a/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch b/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
new file mode 100644
index 0000000000..d6260a5f9d
--- /dev/null
+++ b/main/musl/0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
@@ -0,0 +1,50 @@
+From 53761b469221fbe062629c50249e3d534573eda9 Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Wed, 17 Jul 2013 13:54:41 -0400
+Subject: [PATCH 10/10] make posix_spawn (and functions that use it) use
+ CLONE_VFORK flag
+
+this is both a minor scheduling optimization and a workaround for a
+difficult-to-fix bug in qemu app-level emulation.
+
+from the scheduling standpoint, it makes no sense to schedule the
+parent thread again until the child has exec'd or exited, since the
+parent will immediately block again waiting for it.
+
+on the qemu side, as regular application code running on an underlying
+libc, qemu cannot make arbitrary clone syscalls itself without
+confusing the underlying implementation. instead, it breaks them down
+into either fork-like or pthread_create-like cases. it was treating
+the code in posix_spawn as pthread_create-like, due to CLONE_VM, which
+caused horribly wrong behavior: CLONE_FILES broke the synchronization
+mechanism, CLONE_SIGHAND broke the parent's signals, and CLONE_THREAD
+caused the child's exec to end the parent -- if it hadn't already
+crashed. however, qemu special-cases CLONE_VFORK and emulates that
+with fork, even when CLONE_VM is also specified. this also gives
+incorrect semantics for code that really needs the memory sharing, but
+posix_spawn does not make use of the vm sharing except to avoid
+momentary double commit charge.
+
+programs using posix_spawn (including via popen) should now work
+correctly under qemu app-level emulation.
+---
+ src/process/posix_spawn.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
+index e6a031c..68cf795 100644
+--- a/src/process/posix_spawn.c
++++ b/src/process/posix_spawn.c
+@@ -138,7 +138,8 @@ int __posix_spawnx(pid_t *restrict res, const char *restrict path,
+ 	args.envp = envp;
+ 	pthread_sigmask(SIG_BLOCK, SIGALL_SET, &args.oldmask);
+ 
+-	pid = __clone(child, stack+sizeof stack, CLONE_VM|SIGCHLD, &args);
++	pid = __clone(child, stack+sizeof stack,
++		CLONE_VM|CLONE_VFORK|SIGCHLD, &args);
+ 	close(args.p[1]);
+ 
+ 	if (pid > 0) {
+-- 
+1.8.3.2
+
diff --git a/main/musl/APKBUILD b/main/musl/APKBUILD
index 1a68391b10..df3998210f 100644
--- a/main/musl/APKBUILD
+++ b/main/musl/APKBUILD
@@ -2,7 +2,7 @@
 # Maintainer: William Pitcock <nenolod@dereferenced.org>
 pkgname=musl
 pkgver=0.9.11
-pkgrel=2
+pkgrel=3
 pkgdesc="the musl c library (libc) implementation"
 url="http://www.musl-libc.org/"
 arch="x86 x86_64 arm armel"
@@ -23,6 +23,7 @@ source="http://www.musl-libc.org/releases/musl-$pkgver.tar.gz
 	0007-fix-invalid-library-phdr-pointers-passed-to-callback.patch
 	0008-add-some-ARM-EABI-specific-exception-handling-infras.patch
 	0009-add-PIE-support-for-ARM.patch
+	0010-make-posix_spawn-and-functions-that-use-it-use-CLONE.patch
 
 	getopt_long.c
 	getent
@@ -85,38 +86,41 @@ crosstool() {
 }
 
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