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Groups > linux.kernel > #1620154

[PATCH 3.12 061/142] net: unix: properly re-increment inflight counter of GC discarded candidates

From Jiri Slaby <jslaby@suse.cz>
Newsgroups linux.kernel
Subject [PATCH 3.12 061/142] net: unix: properly re-increment inflight counter of GC discarded candidates
Date 2017-04-10 18:10 +0200
Message-ID <tuK37-2W1-7@gated-at.bofh.it> (permalink)
References <tuJA6-2uY-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Andrey Ulanov <andreyu@google.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit 7df9c24625b9981779afb8fcdbe2bb4765e61147 ]

Dmitry has reported that a BUG_ON() condition in unix_notinflight()
may be triggered by a simple code that forwards unix socket in an
SCM_RIGHTS message.
That is caused by incorrect unix socket GC implementation in unix_gc().

The GC first collects list of candidates, then (a) decrements their
"children's" inflight counter, (b) checks which inflight counters are
now 0, and then (c) increments all inflight counters back.
(a) and (c) are done by calling scan_children() with inc_inflight or
dec_inflight as the second argument.

Commit 6209344f5a37 ("net: unix: fix inflight counting bug in garbage
collector") changed scan_children() such that it no longer considers
sockets that do not have UNIX_GC_CANDIDATE flag. It also added a block
of code that that unsets this flag _before_ invoking
scan_children(, dec_iflight, ). This may lead to incorrect inflight
counters for some sockets.

This change fixes this bug by changing order of operations:
UNIX_GC_CANDIDATE is now unset only after all inflight counters are
restored to the original state.

  kernel BUG at net/unix/garbage.c:149!
  RIP: 0010:[<ffffffff8717ebf4>]  [<ffffffff8717ebf4>]
  unix_notinflight+0x3b4/0x490 net/unix/garbage.c:149
  Call Trace:
   [<ffffffff8716cfbf>] unix_detach_fds.isra.19+0xff/0x170 net/unix/af_unix.c:1487
   [<ffffffff8716f6a9>] unix_destruct_scm+0xf9/0x210 net/unix/af_unix.c:1496
   [<ffffffff86a90a01>] skb_release_head_state+0x101/0x200 net/core/skbuff.c:655
   [<ffffffff86a9808a>] skb_release_all+0x1a/0x60 net/core/skbuff.c:668
   [<ffffffff86a980ea>] __kfree_skb+0x1a/0x30 net/core/skbuff.c:684
   [<ffffffff86a98284>] kfree_skb+0x184/0x570 net/core/skbuff.c:705
   [<ffffffff871789d5>] unix_release_sock+0x5b5/0xbd0 net/unix/af_unix.c:559
   [<ffffffff87179039>] unix_release+0x49/0x90 net/unix/af_unix.c:836
   [<ffffffff86a694b2>] sock_release+0x92/0x1f0 net/socket.c:570
   [<ffffffff86a6962b>] sock_close+0x1b/0x20 net/socket.c:1017
   [<ffffffff81a76b8e>] __fput+0x34e/0x910 fs/file_table.c:208
   [<ffffffff81a771da>] ____fput+0x1a/0x20 fs/file_table.c:244
   [<ffffffff81483ab0>] task_work_run+0x1a0/0x280 kernel/task_work.c:116
   [<     inline     >] exit_task_work include/linux/task_work.h:21
   [<ffffffff8141287a>] do_exit+0x183a/0x2640 kernel/exit.c:828
   [<ffffffff8141383e>] do_group_exit+0x14e/0x420 kernel/exit.c:931
   [<ffffffff814429d3>] get_signal+0x663/0x1880 kernel/signal.c:2307
   [<ffffffff81239b45>] do_signal+0xc5/0x2190 arch/x86/kernel/signal.c:807
   [<ffffffff8100666a>] exit_to_usermode_loop+0x1ea/0x2d0
  arch/x86/entry/common.c:156
   [<     inline     >] prepare_exit_to_usermode arch/x86/entry/common.c:190
   [<ffffffff81009693>] syscall_return_slowpath+0x4d3/0x570
  arch/x86/entry/common.c:259
   [<ffffffff881478e6>] entry_SYSCALL_64_fastpath+0xc4/0xc6

Link: https://lkml.org/lkml/2017/3/6/252
Signed-off-by: Andrey Ulanov <andreyu@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 6209344 ("net: unix: fix inflight counting bug in garbage collector")
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/unix/garbage.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/unix/garbage.c b/net/unix/garbage.c
index a72182d6750f..58ba0e5f147b 100644
--- a/net/unix/garbage.c
+++ b/net/unix/garbage.c
@@ -152,6 +152,7 @@ void unix_notinflight(struct user_struct *user, struct file *fp)
 	if (s) {
 		struct unix_sock *u = unix_sk(s);
 
+		BUG_ON(!atomic_long_read(&u->inflight));
 		BUG_ON(list_empty(&u->link));
 		if (atomic_long_dec_and_test(&u->inflight))
 			list_del_init(&u->link);
@@ -358,6 +359,14 @@ void unix_gc(void)
 	}
 	list_del(&cursor);
 
+	/* Now gc_candidates contains only garbage.  Restore original
+	 * inflight counters for these as well, and remove the skbuffs
+	 * which are creating the cycle(s).
+	 */
+	skb_queue_head_init(&hitlist);
+	list_for_each_entry(u, &gc_candidates, link)
+		scan_children(&u->sk, inc_inflight, &hitlist);
+
 	/*
 	 * not_cycle_list contains those sockets which do not make up a
 	 * cycle.  Restore these to the inflight list.
@@ -368,15 +377,6 @@ void unix_gc(void)
 		list_move_tail(&u->link, &gc_inflight_list);
 	}
 
-	/*
-	 * Now gc_candidates contains only garbage.  Restore original
-	 * inflight counters for these as well, and remove the skbuffs
-	 * which are creating the cycle(s).
-	 */
-	skb_queue_head_init(&hitlist);
-	list_for_each_entry(u, &gc_candidates, link)
-	scan_children(&u->sk, inc_inflight, &hitlist);
-
 	spin_unlock(&unix_gc_lock);
 
 	/* Here we are. Hitlist is filled. Die. */
-- 
2.12.2

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  [PATCH 3.12 029/142] net: net_enable_timestamp() can be called from irq contexts Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 004/142] xhci: fix 10 second timeout on removal of PCI hotpluggable xhci controllers Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 016/142] usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 007/142] crypto: improve gcc optimization flags for serpent and wp512 Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 013/142] MIPS: DEC: Avoid la pseudo-instruction in delay slots Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 025/142] vxlan: correctly validate VXLAN ID against VXLAN_N_VID Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 014/142] tracing: Add #undef to fix compile error Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 002/142] xfs: pass total block res. as total xfs_bmapi_write() parameter Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 009/142] MIPS: ip22: Fix ip28 build for modern gcc Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 011/142] MIPS: ralink: Cosmetic change to prom_init(). Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 010/142] mtd: pmcmsp: use kstrndup instead of kmalloc+strncpy Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 022/142] USB: serial: io_ti: fix information leak in completion handler Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 020/142] USB: iowarrior: fix NULL-deref in write Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 008/142] MIPS: ip27: Disable qlge driver in defconfig Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 021/142] USB: serial: io_ti: fix NULL-deref in interrupt callback Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 031/142] tcp: fix various issues for sockets morphing to listen state Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 006/142] USB: serial: digi_acceleport: fix OOB-event processing Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 027/142] l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200
  [PATCH 3.12 003/142] mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp Jiri Slaby <jslaby@suse.cz> - 2017-04-10 18:20 +0200

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