[Buildroot] [PATCH] busybox: add truncate fix patch

[Gustavo Zacarias]

Signed-off-by: Gustavo Zacarias <gustavo at zacarias.com.ar>
---
 package/busybox/0004-truncate-open-mode.patch | 74 +++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 package/busybox/0004-truncate-open-mode.patch

diff --git a/package/busybox/0004-truncate-open-mode.patch b/package/busybox/0004-truncate-open-mode.patch
new file mode 100644
index 0000000..f0dc6d1
--- /dev/null
+++ b/package/busybox/0004-truncate-open-mode.patch
@@ -0,0 +1,74 @@
+From be729c1d3b5c923f10871dd68ea94156d0f8c803 Mon Sep 17 00:00:00 2001
+From: Ari Sundholm <ari at tuxera.com>
+Date: Mon, 4 Jan 2016 15:40:37 +0200
+Subject: [PATCH] truncate: always set mode when opening file to avoid fortify
+ errors
+
+Busybox crashes due to no mode being given when opening:
+$ ./busybox truncate -s 1M foo
+*** invalid open64 call: O_CREAT without mode ***: ./busybox terminated
+======= Backtrace: =========
+/lib/x86_64-linux-gnu/libc.so.6(+0x7338f)[0x7f66d921338f]
+/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f66d92aac9c]
+/lib/x86_64-linux-gnu/libc.so.6(+0xeb6aa)[0x7f66d928b6aa]
+./busybox[0x4899f9]
+======= Memory map: ========
+00400000-004d0000 r-xp 00000000 00:1a 137559                             /home/ari/busybox/busybox
+006cf000-006d0000 r--p 000cf000 00:1a 137559                             /home/ari/busybox/busybox
+006d0000-006d1000 rw-p 000d0000 00:1a 137559                             /home/ari/busybox/busybox
+006d1000-006d4000 rw-p 00000000 00:00 0
+014e7000-01508000 rw-p 00000000 00:00 0                                  [heap]
+7f66d8f8a000-7f66d8fa0000 r-xp 00000000 08:07 1579008                    /lib/x86_64-linux-gnu/libgcc_s.so.1
+7f66d8fa0000-7f66d919f000 ---p 00016000 08:07 1579008                    /lib/x86_64-linux-gnu/libgcc_s.so.1
+7f66d919f000-7f66d91a0000 rw-p 00015000 08:07 1579008                    /lib/x86_64-linux-gnu/libgcc_s.so.1
+7f66d91a0000-7f66d935b000 r-xp 00000000 08:07 1578994                    /lib/x86_64-linux-gnu/libc-2.19.so
+7f66d935b000-7f66d955a000 ---p 001bb000 08:07 1578994                    /lib/x86_64-linux-gnu/libc-2.19.so
+7f66d955a000-7f66d955e000 r--p 001ba000 08:07 1578994                    /lib/x86_64-linux-gnu/libc-2.19.so
+7f66d955e000-7f66d9560000 rw-p 001be000 08:07 1578994                    /lib/x86_64-linux-gnu/libc-2.19.so
+7f66d9560000-7f66d9565000 rw-p 00000000 00:00 0
+7f66d9565000-7f66d966a000 r-xp 00000000 08:07 1579020                    /lib/x86_64-linux-gnu/libm-2.19.so
+7f66d966a000-7f66d9869000 ---p 00105000 08:07 1579020                    /lib/x86_64-linux-gnu/libm-2.19.so
+7f66d9869000-7f66d986a000 r--p 00104000 08:07 1579020                    /lib/x86_64-linux-gnu/libm-2.19.so
+7f66d986a000-7f66d986b000 rw-p 00105000 08:07 1579020                    /lib/x86_64-linux-gnu/libm-2.19.so
+7f66d986b000-7f66d988e000 r-xp 00000000 08:07 1578981                    /lib/x86_64-linux-gnu/ld-2.19.so
+7f66d9a64000-7f66d9a67000 rw-p 00000000 00:00 0
+7f66d9a8a000-7f66d9a8d000 rw-p 00000000 00:00 0
+7f66d9a8d000-7f66d9a8e000 r--p 00022000 08:07 1578981                    /lib/x86_64-linux-gnu/ld-2.19.so
+7f66d9a8e000-7f66d9a8f000 rw-p 00023000 08:07 1578981                    /lib/x86_64-linux-gnu/ld-2.19.so
+7f66d9a8f000-7f66d9a90000 rw-p 00000000 00:00 0
+7ffc47761000-7ffc47782000 rw-p 00000000 00:00 0                          [stack]
+7ffc477ab000-7ffc477ad000 r-xp 00000000 00:00 0                          [vdso]
+ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
+Aborted (core dumped)
+$
+
+Fix this by simply always setting the mode, as it doesn't hurt even
+when O_CREAT is not specified.
+
+This bug is a regression introduced in fc3e40e, as xopen(), which
+was originally used, would automatically set the mode.
+
+Signed-off-by: Ari Sundholm <ari at tuxera.com>
+Signed-off-by: Mike Frysinger <vapier at gentoo.org>
+(cherry picked from commit e111a1640494fe87fc913f94fae3bb805de0fc99)
+Signed-off-by: Gustavo Zacarias <gustavo at zacarias.com.ar>
+---
+ coreutils/truncate.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/coreutils/truncate.c b/coreutils/truncate.c
+index e5fa656..4c997bf 100644
+--- a/coreutils/truncate.c
++++ b/coreutils/truncate.c
+@@ -64,7 +64,7 @@ int truncate_main(int argc UNUSED_PARAM, char **argv)
+ 
+ 	argv += optind;
+ 	while (*argv) {
+-		int fd = open(*argv, flags);
++		int fd = open(*argv, flags, 0666);
+ 		if (fd < 0) {
+ 			if (errno != ENOENT || !(opts & OPT_NOCREATE)) {
+ 				bb_perror_msg("%s: open", *argv);
+-- 
+2.6.2
+
-- 
2.4.10