Skip to main content

Browse the archive

https://github.com/torvalds/linux
13 June 2022, 11:31:42 UTC
Revision e2653143d7d79a49f1a961aeae1d82612838b12c authored by David S. Miller on 19 October 2014, 03:12:33 UTC, committed by David S. Miller on 19 October 2014, 03:12:33 UTC 
sparc64: Do not define thread fpregs save area as zero-length array.
 
This breaks the stack end corruption detection facility.

What that facility does it write a magic value to "end_of_stack()"
and checking to see if it gets overwritten.

"end_of_stack()" is "task_thread_info(p) + 1", which for sparc64 is
the beginning of the FPU register save area.

So once the user uses the FPU, the magic value is overwritten and the
debug checks trigger.

Fix this by making the size explicit.

Due to the size we use for the fpsaved[], gsr[], and xfsr[] arrays we
are limited to 7 levels of FPU state saves.  So each FPU register set
is 256 bytes, allocate 256 * 7 for the fpregs area.

Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 84bd6d8
History
Tip revision: e2653143d7d79a49f1a961aeae1d82612838b12c authored by David S. Miller on 19 October 2014, 03:12:33 UTC
sparc64: Do not define thread fpregs save area as zero-length array.
Tip revision: e265314
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1.1 KB
.mailmap -rw-r--r-- 4.7 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 93.8 KB
Kbuild -rw-r--r-- 2.5 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 284.0 KB
Makefile -rw-r--r-- 53.1 KB
README -rw-r--r-- 18.3 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

README

back to top