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Janis Schoetterl-Glausch 3d9042f8b9 KVM: s390: Add missing vm MEM_OP size check 
Check that size is not zero, preventing the following warning:

WARNING: CPU: 0 PID: 9692 at mm/vmalloc.c:3059 __vmalloc_node_range+0x528/0x648
Modules linked in:
CPU: 0 PID: 9692 Comm: memop Not tainted 5.17.0-rc3-e4+ #80
Hardware name: IBM 8561 T01 701 (LPAR)
Krnl PSW : 0704c00180000000 0000000082dc584c (__vmalloc_node_range+0x52c/0x648)
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
Krnl GPRS: 0000000000000083 ffffffffffffffff 0000000000000000 0000000000000001
           0000038000000000 000003ff80000000 0000000000000cc0 000000008ebb8000
           0000000087a8a700 000000004040aeb1 000003ffd9f7dec8 000000008ebb8000
           000000009d9b8000 000000000102a1b4 00000380035afb68 00000380035afaa8
Krnl Code: 0000000082dc583e: d028a7f4ff80        trtr    2036(41,%r10),3968(%r15)
           0000000082dc5844: af000000            mc      0,0
          #0000000082dc5848: af000000            mc      0,0
          >0000000082dc584c: a7d90000            lghi    %r13,0
           0000000082dc5850: b904002d            lgr     %r2,%r13
           0000000082dc5854: eb6ff1080004        lmg     %r6,%r15,264(%r15)
           0000000082dc585a: 07fe                bcr     15,%r14
           0000000082dc585c: 47000700            bc      0,1792
Call Trace:
 [<0000000082dc584c>] __vmalloc_node_range+0x52c/0x648
 [<0000000082dc5b62>] vmalloc+0x5a/0x68
 [<000003ff8067f4ca>] kvm_arch_vm_ioctl+0x2da/0x2a30 [kvm]
 [<000003ff806705bc>] kvm_vm_ioctl+0x4ec/0x978 [kvm]
 [<0000000082e562fe>] __s390x_sys_ioctl+0xbe/0x100
 [<000000008360a9bc>] __do_syscall+0x1d4/0x200
 [<0000000083618bd2>] system_call+0x82/0xb0
Last Breaking-Event-Address:
 [<0000000082dc5348>] __vmalloc_node_range+0x28/0x648

Other than the warning, there is no ill effect from the missing check,
the condition is detected by subsequent code and causes a return
with ENOMEM.

Fixes: ef11c9463a (KVM: s390: Add vm IOCTL for key checked guest absolute memory access)
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Link: https://lore.kernel.org/r/20220221163237.4122868-1-scgl@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
 		2022-02-22 09:16:18 +01:00
Documentation KVM: s390: Clarify key argument for MEM_OP in api docs 2022-02-22 09:16:18 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch KVM: s390: Add missing vm MEM_OP size check 2022-02-22 09:16:18 +01:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-03 21:09:24 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto lib/crypto: blake2s: avoid indirect calls to compression function for Clang CFI 2022-02-04 19:22:32 +01:00
drivers ata fixes for 5.17-rc4 2022-02-07 12:10:35 -08:00
fs NFS Client Bugfixes for Linux 5.17-rc 2022-02-08 12:03:07 -08:00
include KVM: s390: Update api documentation for memop ioctl 2022-02-14 16:12:57 +01:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel perf/urgent contains 3 fixups: 2022-02-06 10:11:14 -08:00
lib lib/crypto: blake2s: avoid indirect calls to compression function for Clang CFI 2022-02-04 19:22:32 +01:00
mm mm/kmemleak: avoid scanning potential huge holes 2022-02-04 09:25:05 -08:00
net NFS Client Bugfixes for Linux 5.17-rc 2022-02-08 12:03:07 -08:00
samples Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
scripts ftrace: Have architectures opt-in for mcount build time sorting 2022-01-27 19:15:44 -05:00
security integrity-v5-17-fix 2022-02-07 09:55:14 -08:00
sound ASoC: Fixes for v5.17 2022-02-01 16:52:54 +01:00
tools selftests: kvm: Check whether SIDA memop fails for normal guests 2022-02-15 16:38:12 +01:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Christian Brauner's email address 2022-02-01 11:21:31 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS KVM: s390: MAINTAINERS: promote Claudio Imbrenda 2022-02-11 09:55:53 +01:00
Makefile Linux 5.17-rc3 2022-02-06 12:20:50 -08:00
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.