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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2014-05-13 08:22:39 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2014-05-13 08:22:39 -0300
commitfbf11371027cbe3afb893d10bbafe9e9be052163 (patch)
treef8d3e6644d466cf951c9bf0cec3aeff2514ec002 /libre/linux-libre
parentd1044a10cb6342a37b6be31e37b604b8e7ed746a (diff)
linux-libre-3.14.3-2: fix CVE-2014-0196
Diffstat (limited to 'libre/linux-libre')
-rw-r--r--libre/linux-libre/CVE-2014-0196.patch80
-rw-r--r--libre/linux-libre/PKGBUILD9
2 files changed, 87 insertions, 2 deletions
diff --git a/libre/linux-libre/CVE-2014-0196.patch b/libre/linux-libre/CVE-2014-0196.patch
new file mode 100644
index 000000000..a58707d56
--- /dev/null
+++ b/libre/linux-libre/CVE-2014-0196.patch
@@ -0,0 +1,80 @@
+From 4291086b1f081b869c6d79e5b7441633dc3ace00 Mon Sep 17 00:00:00 2001
+From: Peter Hurley <peter@hurleysoftware.com>
+Date: Sat, 3 May 2014 14:04:59 +0200
+Subject: n_tty: Fix n_tty_write crash when echoing in raw mode
+
+The tty atomic_write_lock does not provide an exclusion guarantee for
+the tty driver if the termios settings are LECHO & !OPOST. And since
+it is unexpected and not allowed to call TTY buffer helpers like
+tty_insert_flip_string concurrently, this may lead to crashes when
+concurrect writers call pty_write. In that case the following two
+writers:
+* the ECHOing from a workqueue and
+* pty_write from the process
+race and can overflow the corresponding TTY buffer like follows.
+
+If we look into tty_insert_flip_string_fixed_flag, there is:
+ int space = __tty_buffer_request_room(port, goal, flags);
+ struct tty_buffer *tb = port->buf.tail;
+ ...
+ memcpy(char_buf_ptr(tb, tb->used), chars, space);
+ ...
+ tb->used += space;
+
+so the race of the two can result in something like this:
+ A B
+__tty_buffer_request_room
+ __tty_buffer_request_room
+memcpy(buf(tb->used), ...)
+tb->used += space;
+ memcpy(buf(tb->used), ...) ->BOOM
+
+B's memcpy is past the tty_buffer due to the previous A's tb->used
+increment.
+
+Since the N_TTY line discipline input processing can output
+concurrently with a tty write, obtain the N_TTY ldisc output_lock to
+serialize echo output with normal tty writes. This ensures the tty
+buffer helper tty_insert_flip_string is not called concurrently and
+everything is fine.
+
+Note that this is nicely reproducible by an ordinary user using
+forkpty and some setup around that (raw termios + ECHO). And it is
+present in kernels at least after commit
+d945cb9cce20ac7143c2de8d88b187f62db99bdc (pty: Rework the pty layer to
+use the normal buffering logic) in 2.6.31-rc3.
+
+js: add more info to the commit log
+js: switch to bool
+js: lock unconditionally
+js: lock only the tty->ops->write call
+
+References: CVE-2014-0196
+Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz>
+Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
+Signed-off-by: Jiri Slaby <jslaby@suse.cz>
+Cc: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
+index 41fe8a0..fe9d129 100644
+--- a/drivers/tty/n_tty.c
++++ b/drivers/tty/n_tty.c
+@@ -2353,8 +2353,12 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
+ if (tty->ops->flush_chars)
+ tty->ops->flush_chars(tty);
+ } else {
++ struct n_tty_data *ldata = tty->disc_data;
++
+ while (nr > 0) {
++ mutex_lock(&ldata->output_lock);
+ c = tty->ops->write(tty, b, nr);
++ mutex_unlock(&ldata->output_lock);
+ if (c < 0) {
+ retval = c;
+ goto break_out;
+--
+cgit v0.10.1-7-g08dc
+
diff --git a/libre/linux-libre/PKGBUILD b/libre/linux-libre/PKGBUILD
index db1d1c223..663e3c916 100644
--- a/libre/linux-libre/PKGBUILD
+++ b/libre/linux-libre/PKGBUILD
@@ -1,4 +1,4 @@
-# $Id: PKGBUILD 212093 2014-05-06 20:49:41Z tpowa $
+# $Id: PKGBUILD 212325 2014-05-12 18:58:13Z tpowa $
# Maintainer: Tobias Powalowski <tpowa@archlinux.org>
# Maintainer: Thomas Baechler <thomas@archlinux.org>
# Maintainer (Parabola): André Silva <emulatorman@parabola.nu>
@@ -12,7 +12,7 @@ pkgbase=linux-libre # Build stock -LIBRE kernel
_basekernel=3.14
_sublevel=3
pkgver=${_basekernel}.${_sublevel}
-pkgrel=1
+pkgrel=2
_lxopkgver=${_basekernel}.3 # nearly always the same as pkgver
arch=('i686' 'x86_64' 'mips64el')
url="http://linux-libre.fsfla.org/"
@@ -21,6 +21,7 @@ makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc')
options=('!strip')
source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_basekernel}-gnu/linux-libre-${_basekernel}-gnu.tar.xz"
"http://linux-libre.fsfla.org/pub/linux-libre/releases/${pkgver}-gnu/patch-${_basekernel}-gnu-${pkgver}-gnu.xz"
+ 'CVE-2014-0196.patch'
# the main kernel config files
'config.i686' 'config.x86_64'
# standard config files for mkinitcpio ramdisk
@@ -43,6 +44,7 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_basekernel}-gn
"http://www.linux-libre.fsfla.org/pub/linux-libre/lemote/gnewsense/pool/debuginfo/linux-patches-${_lxopkgver}-gnu_0loongsonlibre_mipsel.tar.xz")
sha256sums=('477555c709b9407fe37dbd70d3331ff9dde1f9d874aba2741f138d07ae6f281b'
'fcd8398a41a7e55e44123857342fd9041ae1bdacbcf8c5099a53293c96e6fba6'
+ '56d6dc13617645184e2a14b2ee466ccba5241961953f4950aed7377bc34902d7'
'71891ae6903598f4686e86fdb0d371ff9e179e8dac1d2cf60ca16c5190916745'
'fca0060bde385e2c292489087af0aa5f48da594221a6d162fc6f8ba2159571e8'
'dfe01c93d83cdac9ca502715ceb6ac9502d327c939fec2e3052a5a58422dc176'
@@ -81,6 +83,9 @@ prepare() {
# add freedo as boot logo
patch -p1 -i "${srcdir}/boot-logo.patch"
+ # fix upstream CVE-2014-0196
+ patch -p1 -i "${srcdir}/CVE-2014-0196.patch"
+
# add latest fixes from stable queue, if needed
# http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git