main/qemu: attempt fix linux-user for PIE executables

2 files changed, 94 insertions, 1 deletions

diff --git a/main/qemu/0001-elfload-load-PIE-executables-to-right-address.patch b/main/qemu/0001-elfload-load-PIE-executables-to-right-address.patch
new file mode 100644
index 0000000000..1cf0c2bd1b
--- /dev/null
+++ b/main/qemu/0001-elfload-load-PIE-executables-to-right-address.patch
@@ -0,0 +1,89 @@
+From 6818f32f74981d9bccec8afbab37c42b50ab58be Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
+Date: Thu, 4 Jul 2013 15:50:36 +0300
+Subject: [RFC PATCH] elfload: load PIE executables to right address
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+PIE images are ET_DYN images. Check first for pinterp_name to make
+sure the main executable always is loaded to correct place.
+
+See below for current behaviour of PIE executables:
+
+Reserved 0x7f000000 bytes of guest address space
+host mmap_min_addr=0x1000
+guest_base  0x7f7cb41d5000
+start    end      size     prot
+0037f400-003fe400 0007f000 r-x
+003fe400-003ff400 00001000 ---
+003ff400-003fe400 fffff000 rw-
+003fe400-003ff400 00001000 ---
+003ff400-003ffc00 00000800 rw-
+003ffc00-003fec00 fffff000 r-x
+003fec00-003ffc00 00001000 ---
+003ffc00-0007f000 ffc7f400 rw-
+start_brk   0x00000000
+end_code    0x7eff7ac0
+start_code  0x7eff7000
+start_data  0x7efffac0
+end_data    0x7efffc18
+start_stack 0x7eff6dc8
+brk         0x7efffc34
+entry       0x7e799b30
+00000000-00005000 ---p 00000000 00:00 0
+00005000-00015000 rw-p 00000000 00:00 0
+00015000-7e77d000 ---p 00000000 00:00 0
+7e77d000-7e7ec000 r-xp 00000000 68:03 14326298          /lib/libc.so
+7e7ec000-7e7f3000 ---p 00000000 00:00 0
+7e7f3000-7e7f4000 rw-p 0006e000 68:03 14326298          /lib/libc.so
+7e7f4000-7e7f6000 rw-p 00000000 00:00 0
+7e7f6000-7e7f7000 ---p 00000000 00:00 0
+7e7f7000-7eff7000 rw-p 00000000 00:00 0
+7eff7000-7eff8000 r-xp 00000000 68:03 9731305          /usr/bin/brk
+7eff8000-7efff000 ---p 00000000 00:00 0
+7e7f7000-7eff7000 rw-p 00000000 00:00 0          [stack]
+
+Showing how the main binary got loaded to wrong place.
+
+Signed-off-by: Timo Teräs <timo.teras@iki.fi>
+---
+I assume pinterp_name is only ever set for the main executable.
+Quick grep would indicate that this is indeed the case.
+
+ linux-user/elfload.c | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/linux-user/elfload.c b/linux-user/elfload.c
+index ddef23e..d6e00cd 100644
+--- a/linux-user/elfload.c
++++ b/linux-user/elfload.c
+@@ -1660,7 +1660,12 @@ static void load_elf_image(const char *image_name, int image_fd,
+     }
+ 
+     load_addr = loaddr;
+-    if (ehdr->e_type == ET_DYN) {
++    if (pinterp_name != NULL) {
++        /* This is the main executable.  Make sure that the low
++           address does not conflict with MMAP_MIN_ADDR or the
++           QEMU application itself.  */
++        probe_guest_base(image_name, loaddr, hiaddr);
++    } else if (ehdr->e_type == ET_DYN) {
+         /* The image indicates that it can be loaded anywhere.  Find a
+            location that can hold the memory space required.  If the
+            image is pre-linked, LOADDR will be non-zero.  Since we do
+@@ -1672,11 +1677,6 @@ static void load_elf_image(const char *image_name, int image_fd,
+         if (load_addr == -1) {
+             goto exit_perror;
+         }
+-    } else if (pinterp_name != NULL) {
+-        /* This is the main executable.  Make sure that the low
+-           address does not conflict with MMAP_MIN_ADDR or the
+-           QEMU application itself.  */
+-        probe_guest_base(image_name, loaddr, hiaddr);
+     }
+     load_bias = load_addr - loaddr;
+ 
+-- 
+1.8.3.2
+
diff --git a/main/qemu/APKBUILD b/main/qemu/APKBUILD
index f33e69f147..7d3477065f 100644
--- a/main/qemu/APKBUILD
+++ b/main/qemu/APKBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=qemu
 pkgver=1.5.1
-pkgrel=2
+pkgrel=3
 pkgdesc="QEMU is a generic machine emulator and virtualizer"
 url="http://qemu.org/"
 arch="all"
@@ -71,6 +71,7 @@ $pkgname-img
 $pkgname-guest-agent:guest
 "
 source="http://wiki.qemu-project.org/download/qemu-$pkgver.tar.bz2
+	0001-elfload-load-PIE-executables-to-right-address.patch
 	qemu-guest-agent.confd
 	qemu-guest-agent.initd
 	80-kvm.rules"
@@ -223,14 +224,17 @@ guest() {
 }
 
 md5sums="b56e73bdcfdb214d5c68e13111aca96f  qemu-1.5.1.tar.bz2
+672727bb1d8c8ab7b5def65dd1793c33  0001-elfload-load-PIE-executables-to-right-address.patch
 1663bc6977f6886a58394155b1bf3676  qemu-guest-agent.confd
 2035cd781ea810e94bda250c609d8d90  qemu-guest-agent.initd
 66660f143235201249dc0648b39b86ee  80-kvm.rules"
 sha256sums="4c15a1ee2f387983eb5c1497f66bf567c34d14ba48517148f6eafef8ae09e3e8  qemu-1.5.1.tar.bz2
+af35304b165622a53f7557b59ffd8da5030f5fd444e669c862f9410131f3b987  0001-elfload-load-PIE-executables-to-right-address.patch
 d84e53a94584f37f3bd1b21f44077b5de0d07094c6729f26ae20ab1f7b9cc298  qemu-guest-agent.confd
 982fa8ba67c728405305e4cf5a36a41a780b3d1f388ebd6377e7964c271a1c92  qemu-guest-agent.initd
 37f666f1cdb7d8a62171de69b531681dcb0fba74236729dac8b6c019232eba84  80-kvm.rules"
 sha512sums="ea28434f786bd36d99f7908380f9dcd18def36899d001170edb9c1e6c341d81fab64d7d13b9028b01cb479ecb35f62975fe928767ac585267dd4ef7ffeb7b823  qemu-1.5.1.tar.bz2
+405008589cad1c8b609eca004d520bf944366e8525f85a19fc6e283c95b84b6c2429822ba064675823ab69f1406a57377266a65021623d1cd581e7db000134fd  0001-elfload-load-PIE-executables-to-right-address.patch
 d90c034cae3f9097466854ed1a9f32ab4b02089fcdf7320e8f4da13b2b1ff65067233f48809911485e4431d7ec1a22448b934121bc9522a2dc489009e87e2b1f  qemu-guest-agent.confd
 761b4e2397569dae45ae3bb9e46e28746275297f629af9e9065525497fd26a48b65d8abcf4282727afd35309e338967acf6a1b14c3169577bdc16c1f42e618b3  qemu-guest-agent.initd
 9b7a89b20fcf737832cb7b4d5dc7d8301dd88169cbe5339eda69fbb51c2e537d8cb9ec7cf37600899e734209e63410d50d0821bce97e401421db39c294d97be2  80-kvm.rules"