Skip to main content

Browse the archive

https://github.com/torvalds/linux
17 May 2024, 11:00:25 UTC
Revision 4d62e81b60d4025e2dfcd5ea531cc1394ce9226f authored by Russell King on 01 February 2021, 19:40:01 UTC, committed by Russell King on 05 February 2021, 10:23:29 UTC 
ARM: kexec: fix oops after TLB are invalidated
 
Giancarlo Ferrari reports the following oops while trying to use kexec:

 Unable to handle kernel paging request at virtual address 80112f38
 pgd = fd7ef03e
 [80112f38] *pgd=0001141e(bad)
 Internal error: Oops: 80d [#1] PREEMPT SMP ARM
 ...

This is caused by machine_kexec() trying to set the kernel text to be
read/write, so it can poke values into the relocation code before
copying it - and an interrupt occuring which changes the page tables.
The subsequent writes then hit read-only sections that trigger a
data abort resulting in the above oops.

Fix this by copying the relocation code, and then writing the variables
into the destination, thereby avoiding the need to make the kernel text
read/write.

Reported-by: Giancarlo Ferrari <giancarlo.ferrari89@gmail.com>
Tested-by: Giancarlo Ferrari <giancarlo.ferrari89@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
1 parent 9c698bf
History
Tip revision: 4d62e81b60d4025e2dfcd5ea531cc1394ce9226f authored by Russell King on 01 February 2021, 19:40:01 UTC
ARM: kexec: fix oops after TLB are invalidated
Tip revision: 4d62e81
File Mode Size
Documentation
LICENSES
arch
block
certs
crypto
drivers
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.clang-format -rw-r--r-- 16.3 KB
.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 71 bytes
.gitattributes -rw-r--r-- 62 bytes
.gitignore -rw-r--r-- 1.8 KB
.mailmap -rw-r--r-- 17.9 KB
COPYING -rw-r--r-- 496 bytes
CREDITS -rw-r--r-- 97.9 KB
Kbuild -rw-r--r-- 1.3 KB
Kconfig -rw-r--r-- 555 bytes
MAINTAINERS -rw-r--r-- 572.1 KB
Makefile -rw-r--r-- 62.9 KB
README -rw-r--r-- 727 bytes

README

back to top