mainlining shenanigans
a61df3c413
syzkaller found the following JFFS2 splat:
Unable to handle kernel paging request at virtual address dfffa00000000001
Mem abort info:
ESR = 0x96000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
Data abort info:
ISV = 0, ISS = 0x00000004
CM = 0, WnR = 0
[dfffa00000000001] address between user and kernel address ranges
Internal error: Oops: 96000004 [#1] SMP
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 12745 Comm: syz-executor.5 Tainted: G S 5.9.0-rc8+ #98
Hardware name: linux,dummy-virt (DT)
pstate: 20400005 (nzCv daif +PAN -UAO BTYPE=--)
pc : jffs2_parse_param+0x138/0x308 fs/jffs2/super.c:206
lr : jffs2_parse_param+0x108/0x308 fs/jffs2/super.c:205
sp : ffff000022a57910
x29: ffff000022a57910 x28: 0000000000000000
x27: ffff000057634008 x26: 000000000000d800
x25: 000000000000d800 x24: ffff0000271a9000
x23: ffffa0001adb5dc0 x22: ffff000023fdcf00
x21: 1fffe0000454af2c x20: ffff000024cc9400
x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffffa000102dbdd0
x15: 0000000000000000 x14: ffffa000109e44bc
x13: ffffa00010a3a26c x12: ffff80000476e0b3
x11: 1fffe0000476e0b2 x10: ffff80000476e0b2
x9 : ffffa00010a3ad60 x8 : ffff000023b70593
x7 : 0000000000000003 x6 : 00000000f1f1f1f1
x5 : ffff000023fdcf00 x4 : 0000000000000002
x3 : ffffa00010000000 x2 : 0000000000000001
x1 : dfffa00000000000 x0 : 0000000000000008
Call trace:
jffs2_parse_param+0x138/0x308 fs/jffs2/super.c:206
vfs_parse_fs_param+0x234/0x4e8 fs/fs_context.c:117
vfs_parse_fs_string+0xe8/0x148 fs/fs_context.c:161
generic_parse_monolithic+0x17c/0x208 fs/fs_context.c:201
parse_monolithic_mount_data+0x7c/0xa8 fs/fs_context.c:649
do_new_mount fs/namespace.c:2871 [inline]
path_mount+0x548/0x1da8 fs/namespace.c:3192
do_mount+0x124/0x138 fs/namespace.c:3205
__do_sys_mount fs/namespace.c:3413 [inline]
__se_sys_mount fs/namespace.c:3390 [inline]
__arm64_sys_mount+0x164/0x238 fs/namespace.c:3390
__invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]
el0_svc_common.constprop.0+0x15c/0x598 arch/arm64/kernel/syscall.c:149
do_el0_svc+0x60/0x150 arch/arm64/kernel/syscall.c:195
el0_svc+0x34/0xb0 arch/arm64/kernel/entry-common.c:226
el0_sync_handler+0xc8/0x5b4 arch/arm64/kernel/entry-common.c:236
el0_sync+0x15c/0x180 arch/arm64/kernel/entry.S:663
Code: d2d40001 f2fbffe1 91002260 d343fc02 (38e16841)
---[ end trace 4edf690313deda44 ]---
This is because since
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.