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Tetsuo Handa 566d136289 pipe: Fix pipe_full() test in opipe_prep(). 
syzbot is reporting that splice()ing from non-empty read side to
already-full write side causes unkillable task, for opipe_prep() is by
error not inverting pipe_full() test.

  CPU: 0 PID: 9460 Comm: syz-executor.5 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
  RIP: 0010:rol32 include/linux/bitops.h:105 [inline]
  RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:369 [inline]
  RIP: 0010:__lock_acquire+0x6a3/0x5270 kernel/locking/lockdep.c:4178
  Call Trace:
     lock_acquire+0x197/0x420 kernel/locking/lockdep.c:4720
     __mutex_lock_common kernel/locking/mutex.c:956 [inline]
     __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
     pipe_lock_nested fs/pipe.c:66 [inline]
     pipe_double_lock+0x1a0/0x1e0 fs/pipe.c:104
     splice_pipe_to_pipe fs/splice.c:1562 [inline]
     do_splice+0x35f/0x1520 fs/splice.c:1141
     __do_sys_splice fs/splice.c:1447 [inline]
     __se_sys_splice fs/splice.c:1427 [inline]
     __x64_sys_splice+0x2b5/0x320 fs/splice.c:1427
     do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295
     entry_SYSCALL_64_after_hwframe+0x49/0xbe

Reported-by: syzbot+b48daca8639150bc5e73@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=9386d051e11e09973d5a4cf79af5e8cedf79386d
Fixes: 8cefc107ca ("pipe: Use head and tail pointers for the ring, not cursor and length")
Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-05-20 10:54:29 -07:00
arch ARC fixes for 5.7 2020-05-19 15:40:51 -07:00
block bdi: use bdi_dev_name() to get device name 2020-05-09 16:07:39 -06:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto gcc-10: avoid shadowing standard library 'free()' in crypto 2020-05-09 15:58:04 -07:00
Documentation USB fixes for 5.7-rc6 2020-05-17 12:31:22 -07:00
drivers Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-05-19 11:52:24 -07:00
fs pipe: Fix pipe_full() test in opipe_prep(). 2020-05-20 10:54:29 -07:00
include Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-05-19 11:52:24 -07:00
init A single fix for early boot crashes of kernels built with gcc10 and 2020-05-17 11:08:29 -07:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-14 10:00:35 -07:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:10:06 -07:00
lib vsprintf: don't obfuscate NULL and error pointers 2020-05-19 11:35:38 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm kasan: add missing functions declarations to kasan.h 2020-05-14 10:00:35 -07:00
net NFS client bugfixes for Linux 5.7 2020-05-15 14:03:13 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:10:06 -07:00
scripts scripts/gdb: repair rb_first() and rb_last() 2020-05-07 19:27:20 -07:00
security Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity 2020-05-18 11:29:21 -07:00
sound sound fixes for 5.7-rc6 2020-05-15 10:06:49 -07:00
tools A new testcase for guest debugging (gdbstub) that exposed a bunch of 2020-05-16 13:39:22 -07:00
usr kbuild: fix comment about missing include guard detection 2020-04-11 12:09:48 +09:00
virt KVM: Introduce kvm_make_all_cpus_request_except() 2020-05-08 07:44:32 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2020-04-18 13:49:33 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
.mailmap i2c: use my kernel.org address from now on 2020-05-05 16:29:09 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Hand MIPS over to Thomas 2020-02-24 22:43:18 -08:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-05-19 11:52:24 -07:00
Makefile Linux 5.7-rc6 2020-05-17 16:48:37 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.