[arch-commits] Commit in linux-lts/trunk (2 files)
Andreas Radke
andyrtr at archlinux.org
Sun Mar 12 13:15:20 UTC 2017
Date: Sunday, March 12, 2017 @ 13:15:19
Author: andyrtr
Revision: 290674
upgpkg: linux-lts 4.9.14-1
upstream update 4.9.14; apply fix for CVE-2017-2636
Added:
linux-lts/trunk/0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch
Modified:
linux-lts/trunk/PKGBUILD
---------------------------------------------------+
0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch | 311 ++++++++++++++++++++
PKGBUILD | 13
2 files changed, 320 insertions(+), 4 deletions(-)
Added: 0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch
===================================================================
--- 0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch (rev 0)
+++ 0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch 2017-03-12 13:15:19 UTC (rev 290674)
@@ -0,0 +1,311 @@
+>From 1dea7a8061ad9212f4464464a80d0dcd477eceab Mon Sep 17 00:00:00 2001
+From: Alexander Popov <alex.popov () linux com>
+Date: Tue, 28 Feb 2017 19:28:54 +0300
+Subject: [PATCH 1/1] tty: n_hdlc: get rid of racy n_hdlc.tbuf
+
+Currently N_HDLC line discipline uses a self-made singly linked list for
+data buffers and has n_hdlc.tbuf pointer for buffer retransmitting after
+an error.
+
+The commit be10eb7589337e5defbe214dae038a53dd21add8
+("tty: n_hdlc add buffer flushing") introduced racy access to n_hdlc.tbuf.
+After tx error concurrent flush_tx_queue() and n_hdlc_send_frames() can put
+one data buffer to tx_free_buf_list twice. That causes double free in
+n_hdlc_release().
+
+Let's use standard kernel linked list and get rid of n_hdlc.tbuf:
+in case of tx error put current data buffer after the head of tx_buf_list.
+
+Signed-off-by: Alexander Popov <alex.popov () linux com>
+---
+ drivers/tty/n_hdlc.c | 132 +++++++++++++++++++++++++++------------------------
+ 1 file changed, 69 insertions(+), 63 deletions(-)
+
+diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
+index eb27883..728c824 100644
+--- a/drivers/tty/n_hdlc.c
++++ b/drivers/tty/n_hdlc.c
+@@ -114,7 +114,7 @@
+ #define DEFAULT_TX_BUF_COUNT 3
+
+ struct n_hdlc_buf {
+- struct n_hdlc_buf *link;
++ struct list_head list_item;
+ int count;
+ char buf[1];
+ };
+@@ -122,8 +122,7 @@ struct n_hdlc_buf {
+ #define N_HDLC_BUF_SIZE (sizeof(struct n_hdlc_buf) + maxframe)
+
+ struct n_hdlc_buf_list {
+- struct n_hdlc_buf *head;
+- struct n_hdlc_buf *tail;
++ struct list_head list;
+ int count;
+ spinlock_t spinlock;
+ };
+@@ -136,7 +135,6 @@ struct n_hdlc_buf_list {
+ * @backup_tty - TTY to use if tty gets closed
+ * @tbusy - reentrancy flag for tx wakeup code
+ * @woke_up - FIXME: describe this field
+- * @tbuf - currently transmitting tx buffer
+ * @tx_buf_list - list of pending transmit frame buffers
+ * @rx_buf_list - list of received frame buffers
+ * @tx_free_buf_list - list unused transmit frame buffers
+@@ -149,7 +147,6 @@ struct n_hdlc {
+ struct tty_struct *backup_tty;
+ int tbusy;
+ int woke_up;
+- struct n_hdlc_buf *tbuf;
+ struct n_hdlc_buf_list tx_buf_list;
+ struct n_hdlc_buf_list rx_buf_list;
+ struct n_hdlc_buf_list tx_free_buf_list;
+@@ -159,6 +156,8 @@ struct n_hdlc {
+ /*
+ * HDLC buffer list manipulation functions
+ */
++static void n_hdlc_buf_return(struct n_hdlc_buf_list *buf_list,
++ struct n_hdlc_buf *buf);
+ static void n_hdlc_buf_put(struct n_hdlc_buf_list *list,
+ struct n_hdlc_buf *buf);
+ static struct n_hdlc_buf *n_hdlc_buf_get(struct n_hdlc_buf_list *list);
+@@ -208,16 +207,9 @@ static void flush_tx_queue(struct tty_struct *tty)
+ {
+ struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
+ struct n_hdlc_buf *buf;
+- unsigned long flags;
+
+ while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))
+ n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);
+- spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);
+- if (n_hdlc->tbuf) {
+- n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, n_hdlc->tbuf);
+- n_hdlc->tbuf = NULL;
+- }
+- spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
+ }
+
+ static struct tty_ldisc_ops n_hdlc_ldisc = {
+@@ -283,7 +275,6 @@ static void n_hdlc_release(struct n_hdlc *n_hdlc)
+ } else
+ break;
+ }
+- kfree(n_hdlc->tbuf);
+ kfree(n_hdlc);
+
+ } /* end of n_hdlc_release() */
+@@ -402,13 +393,7 @@ static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
+ n_hdlc->woke_up = 0;
+ spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
+
+- /* get current transmit buffer or get new transmit */
+- /* buffer from list of pending transmit buffers */
+-
+- tbuf = n_hdlc->tbuf;
+- if (!tbuf)
+- tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);
+-
++ tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);
+ while (tbuf) {
+ if (debuglevel >= DEBUG_LEVEL_INFO)
+ printk("%s(%d)sending frame %p, count=%d\n",
+@@ -420,7 +405,7 @@ static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
+
+ /* rollback was possible and has been done */
+ if (actual == -ERESTARTSYS) {
+- n_hdlc->tbuf = tbuf;
++ n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);
+ break;
+ }
+ /* if transmit error, throw frame away by */
+@@ -435,10 +420,7 @@ static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
+
+ /* free current transmit buffer */
+ n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, tbuf);
+-
+- /* this tx buffer is done */
+- n_hdlc->tbuf = NULL;
+-
++
+ /* wait up sleeping writers */
+ wake_up_interruptible(&tty->write_wait);
+
+@@ -448,10 +430,12 @@ static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
+ if (debuglevel >= DEBUG_LEVEL_INFO)
+ printk("%s(%d)frame %p pending\n",
+ __FILE__,__LINE__,tbuf);
+-
+- /* buffer not accepted by driver */
+- /* set this buffer as pending buffer */
+- n_hdlc->tbuf = tbuf;
++
++ /*
++ * the buffer was not accepted by driver,
++ * return it back into tx queue
++ */
++ n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);
+ break;
+ }
+ }
+@@ -749,7 +733,8 @@ static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
+ int error = 0;
+ int count;
+ unsigned long flags;
+-
++ struct n_hdlc_buf *buf = NULL;
++
+ if (debuglevel >= DEBUG_LEVEL_INFO)
+ printk("%s(%d)n_hdlc_tty_ioctl() called %d\n",
+ __FILE__,__LINE__,cmd);
+@@ -763,8 +748,10 @@ static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
+ /* report count of read data available */
+ /* in next available frame (if any) */
+ spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags);
+- if (n_hdlc->rx_buf_list.head)
+- count = n_hdlc->rx_buf_list.head->count;
++ buf = list_first_entry_or_null(&n_hdlc->rx_buf_list.list,
++ struct n_hdlc_buf, list_item);
++ if (buf)
++ count = buf->count;
+ else
+ count = 0;
+ spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags);
+@@ -776,8 +763,10 @@ static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
+ count = tty_chars_in_buffer(tty);
+ /* add size of next output frame in queue */
+ spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock,flags);
+- if (n_hdlc->tx_buf_list.head)
+- count += n_hdlc->tx_buf_list.head->count;
++ buf = list_first_entry_or_null(&n_hdlc->tx_buf_list.list,
++ struct n_hdlc_buf, list_item);
++ if (buf)
++ count += buf->count;
+ spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock,flags);
+ error = put_user(count, (int __user *)arg);
+ break;
+@@ -825,14 +814,14 @@ static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
+ poll_wait(filp, &tty->write_wait, wait);
+
+ /* set bits for operations that won't block */
+- if (n_hdlc->rx_buf_list.head)
++ if (!list_empty(&n_hdlc->rx_buf_list.list))
+ mask |= POLLIN | POLLRDNORM; /* readable */
+ if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
+ mask |= POLLHUP;
+ if (tty_hung_up_p(filp))
+ mask |= POLLHUP;
+ if (!tty_is_writelocked(tty) &&
+- n_hdlc->tx_free_buf_list.head)
++ !list_empty(&n_hdlc->tx_free_buf_list.list))
+ mask |= POLLOUT | POLLWRNORM; /* writable */
+ }
+ return mask;
+@@ -856,7 +845,12 @@ static struct n_hdlc *n_hdlc_alloc(void)
+ spin_lock_init(&n_hdlc->tx_free_buf_list.spinlock);
+ spin_lock_init(&n_hdlc->rx_buf_list.spinlock);
+ spin_lock_init(&n_hdlc->tx_buf_list.spinlock);
+-
++
++ INIT_LIST_HEAD(&n_hdlc->rx_free_buf_list.list);
++ INIT_LIST_HEAD(&n_hdlc->tx_free_buf_list.list);
++ INIT_LIST_HEAD(&n_hdlc->rx_buf_list.list);
++ INIT_LIST_HEAD(&n_hdlc->tx_buf_list.list);
++
+ /* allocate free rx buffer list */
+ for(i=0;i<DEFAULT_RX_BUF_COUNT;i++) {
+ buf = kmalloc(N_HDLC_BUF_SIZE, GFP_KERNEL);
+@@ -884,53 +878,65 @@ static struct n_hdlc *n_hdlc_alloc(void)
+ } /* end of n_hdlc_alloc() */
+
+ /**
++ * n_hdlc_buf_return - put the HDLC buffer after the head of the specified list
++ * @buf_list - pointer to the buffer list
++ * @buf - pointer to the buffer
++ */
++static void n_hdlc_buf_return(struct n_hdlc_buf_list *buf_list,
++ struct n_hdlc_buf *buf)
++{
++ unsigned long flags;
++
++ spin_lock_irqsave(&buf_list->spinlock, flags);
++
++ list_add(&buf->list_item, &buf_list->list);
++ buf_list->count++;
++
++ spin_unlock_irqrestore(&buf_list->spinlock, flags);
++}
++
++/**
+ * n_hdlc_buf_put - add specified HDLC buffer to tail of specified list
+- * @list - pointer to buffer list
++ * @buf_list - pointer to buffer list
+ * @buf - pointer to buffer
+ */
+-static void n_hdlc_buf_put(struct n_hdlc_buf_list *list,
++static void n_hdlc_buf_put(struct n_hdlc_buf_list *buf_list,
+ struct n_hdlc_buf *buf)
+ {
+ unsigned long flags;
+- spin_lock_irqsave(&list->spinlock,flags);
+-
+- buf->link=NULL;
+- if (list->tail)
+- list->tail->link = buf;
+- else
+- list->head = buf;
+- list->tail = buf;
+- (list->count)++;
+-
+- spin_unlock_irqrestore(&list->spinlock,flags);
+-
++
++ spin_lock_irqsave(&buf_list->spinlock, flags);
++
++ list_add_tail(&buf->list_item, &buf_list->list);
++ buf_list->count++;
++
++ spin_unlock_irqrestore(&buf_list->spinlock, flags);
+ } /* end of n_hdlc_buf_put() */
+
+ /**
+ * n_hdlc_buf_get - remove and return an HDLC buffer from list
+- * @list - pointer to HDLC buffer list
++ * @buf_list - pointer to HDLC buffer list
+ *
+ * Remove and return an HDLC buffer from the head of the specified HDLC buffer
+ * list.
+ * Returns a pointer to HDLC buffer if available, otherwise %NULL.
+ */
+-static struct n_hdlc_buf* n_hdlc_buf_get(struct n_hdlc_buf_list *list)
++static struct n_hdlc_buf *n_hdlc_buf_get(struct n_hdlc_buf_list *buf_list)
+ {
+ unsigned long flags;
+ struct n_hdlc_buf *buf;
+- spin_lock_irqsave(&list->spinlock,flags);
+-
+- buf = list->head;
++
++ spin_lock_irqsave(&buf_list->spinlock, flags);
++
++ buf = list_first_entry_or_null(&buf_list->list,
++ struct n_hdlc_buf, list_item);
+ if (buf) {
+- list->head = buf->link;
+- (list->count)--;
++ list_del(&buf->list_item);
++ buf_list->count--;
+ }
+- if (!list->head)
+- list->tail = NULL;
+-
+- spin_unlock_irqrestore(&list->spinlock,flags);
++
++ spin_unlock_irqrestore(&buf_list->spinlock, flags);
+ return buf;
+-
+ } /* end of n_hdlc_buf_get() */
+
+ static char hdlc_banner[] __initdata =
+--
+2.7.4
+
Modified: PKGBUILD
===================================================================
--- PKGBUILD 2017-03-12 12:48:30 UTC (rev 290673)
+++ PKGBUILD 2017-03-12 13:15:19 UTC (rev 290674)
@@ -4,7 +4,7 @@
pkgbase=linux-lts
#pkgbase=linux-lts-custom
_srcname=linux-4.9
-pkgver=4.9.13
+pkgver=4.9.14
pkgrel=1
arch=('i686' 'x86_64')
url="https://www.kernel.org/"
@@ -19,17 +19,19 @@
'99-linux.hook'
# standard config files for mkinitcpio ramdisk
linux-lts.preset
- change-default-console-loglevel.patch)
+ change-default-console-loglevel.patch
+ 0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch)
# https://www.kernel.org/pub/linux/kernel/v4.x/sha256sums.asc
sha256sums=('029098dcffab74875e086ae970e3828456838da6e0ba22ce3f64ef764f3d7f1a'
'SKIP'
- '87a0f07dd393e2d08850f0536417d091684535ff0c8ab8f8d9aeab1db38589bf'
+ '056282412144bdb8bb1d33a5b22a5605ed836a8061dfd65926e25ba71119d518'
'SKIP'
'd577759532f56b0df073cdc0f2aa3975f1325b8a91851050bb678e18ace6700c'
'521943d91f3e2a42b9848c429063db2b554e4433366fa8341ab9186a1151d0ca'
'834bd254b56ab71d73f59b3221f056c72f559553c04718e350ab2a3e2991afe0'
'1f036f7464da54ae510630f0edb69faa115287f86d9f17641197ffda8cfd49e0'
- '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99')
+ '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
+ 'd0b412416963cefbb9baa06ef055e2b9485e2b9f948da14dfe50ee863577405c')
validpgpkeys=('ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds <torvalds at linux-foundation.org>
'647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman (Linux kernel stable release signing key) <greg at kroah.com>
)
@@ -45,6 +47,9 @@
# add latest fixes from stable queue, if needed
# http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
+ # patch for CVE-2017-2636)
+ patch -p1 -i "${srcdir}/0001-tty-n_hdlc-get-rid-of-racy-n_hdlc_tbuf.patch"
+
# set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param)
# remove this when a Kconfig knob is made available by upstream
# (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
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