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He Zhe 78e70e780b nfsd4: Fix kernel crash when reading proc file reply_cache_stats 
reply_cache_stats uses wrong parameter as seq file private structure and
thus causes the following kernel crash when users read
/proc/fs/nfsd/reply_cache_stats

BUG: kernel NULL pointer dereference, address: 00000000000001f9
PGD 0 P4D 0
Oops: 0000 [#3] SMP PTI
CPU: 6 PID: 1502 Comm: cat Tainted: G      D           5.3.0-rc3+ #1
Hardware name: Intel Corporation Broadwell Client platform/Basking Ridge, BIOS BDW-E2R1.86C.0118.R01.1503110618 03/11/2015
RIP: 0010:nfsd_reply_cache_stats_show+0x3b/0x2d0
Code: 41 54 49 89 f4 48 89 fe 48 c7 c7 b3 10 33 88 53 bb e8 03 00 00 e8 88 82 d1 ff bf 58 89 41 00 e8 eb c5 85 00 48 83 eb 01 75 f0 <41> 8b 94 24 f8 01 00 00 48 c7 c6 be 10 33 88 4c 89 ef bb e8 03 00
RSP: 0018:ffffaa520106fe08 EFLAGS: 00010246
RAX: 000000cfe1a77123 RBX: 0000000000000000 RCX: 0000000000291b46
RDX: 000000cf00000000 RSI: 0000000000000006 RDI: 0000000000291b28
RBP: ffffaa520106fe20 R08: 0000000000000006 R09: 000000cfe17e55dd
R10: ffffa424e47c0000 R11: 000000000000030b R12: 0000000000000001
R13: ffffa424e5697000 R14: 0000000000000001 R15: ffffa424e5697000
FS:  00007f805735f580(0000) GS:ffffa424f8f80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000001f9 CR3: 00000000655ce005 CR4: 00000000003606e0
Call Trace:
 seq_read+0x194/0x3e0
 __vfs_read+0x1b/0x40
 vfs_read+0x95/0x140
 ksys_read+0x61/0xe0
 __x64_sys_read+0x1a/0x20
 do_syscall_64+0x4d/0x120
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f805728b861
Code: fe ff ff 50 48 8d 3d 86 b4 09 00 e8 79 e0 01 00 66 0f 1f 84 00 00 00 00 00 48 8d 05 d9 19 0d 00 8b 00 85 c0 75 13 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 57 c3 66 0f 1f 44 00 00 48 83 ec 28 48 89 54
RSP: 002b:00007ffea1ce3c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f805728b861
RDX: 0000000000020000 RSI: 00007f8057183000 RDI: 0000000000000003
RBP: 00007f8057183000 R08: 00007f8057182010 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000559a60e8ff10
R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000
Modules linked in:
CR2: 00000000000001f9
---[ end trace 01613595153f0cba ]---
RIP: 0010:nfsd_reply_cache_stats_show+0x3b/0x2d0
Code: 41 54 49 89 f4 48 89 fe 48 c7 c7 b3 10 33 88 53 bb e8 03 00 00 e8 88 82 d1 ff bf 58 89 41 00 e8 eb c5 85 00 48 83 eb 01 75 f0 <41> 8b 94 24 f8 01 00 00 48 c7 c6 be 10 33 88 4c 89 ef bb e8 03 00
RSP: 0018:ffffaa52004b3e08 EFLAGS: 00010246
RAX: 0000002bab45a7c6 RBX: 0000000000000000 RCX: 0000000000291b4c
RDX: 0000002b00000000 RSI: 0000000000000004 RDI: 0000000000291b28
RBP: ffffaa52004b3e20 R08: 0000000000000004 R09: 0000002bab1c8c7a
R10: ffffa424e5500000 R11: 00000000000002a9 R12: 0000000000000001
R13: ffffa424e4475000 R14: 0000000000000001 R15: ffffa424e4475000
FS:  00007f805735f580(0000) GS:ffffa424f8f80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000001f9 CR3: 00000000655ce005 CR4: 00000000003606e0
Killed

Fixes: 3ba75830ce ("nfsd4: drc containerization")
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2019-08-16 13:36:55 -04:00
arch SPDX fixes for 5.3-rc2 2019-07-28 10:00:06 -07:00
block for-linus-20190726-2 2019-07-26 19:20:34 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation USB fixes for 5.3-rc2 2019-07-28 09:52:35 -07:00
drivers Char/Misc driver fixes for 5.3-rc2 2019-07-28 10:26:10 -07:00
fs nfsd4: Fix kernel crash when reading proc file reply_cache_stats 2019-08-16 13:36:55 -04:00
include TTY fixes for 5.3-rc2 2019-07-28 10:18:33 -07:00
init Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
ipc Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
kernel Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-27 21:22:33 -07:00
lib test_firmware: fix a memory leak bug 2019-07-25 14:39:52 +02:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy() 2019-07-22 10:18:30 +02:00
net tcp: be more careful in tcp_fragment() 2019-07-21 20:41:24 -07:00
samples treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers again 2019-07-25 11:05:10 +02:00
scripts Kbuild fixes for v5.3 2019-07-28 10:35:04 -07:00
security meminit fix 2019-07-28 12:33:15 -07:00
sound sound fixes for 5.3-rc2 2019-07-26 10:23:45 -07:00
tools Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-27 21:17:56 -07:00
usr kbuild: enable arch/s390/include/uapi/asm/zcrypt.h for uapi header test 2019-07-23 10:45:46 +02:00
virt Documentation: move Documentation/virtual to Documentation/virt 2019-07-24 10:52:11 +02:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore .gitignore: Add compilation database file 2019-07-27 12:18:19 +09:00
.mailmap MAINTAINERS: Update my email address 2019-07-22 14:57:50 +01:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Remove references to dead website. 2019-07-19 12:22:04 -07:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Char/Misc driver fixes for 5.3-rc2 2019-07-28 10:26:10 -07:00
Makefile Linux 5.3-rc2 2019-07-28 12:47:02 -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.