WSL2-Linux-Kernel/arch/sparc
David S. Miller aeb3987683 sparc64: Fix probe_kernel_{read,write}().
This is based upon a report from Chris Torek and his initial patch.
From Chris's report:

--------------------
This came up in testing kgdb, using the built-in tests -- turn
on CONFIG_KGDB_TESTS, then

    echo V1 > /sys/module/kgdbts/parameters/kgdbts

-- but it would affect using kgdb if you were debugging and looking
at bad pointers.
--------------------

When we get a copy_{from,to}_user() request and the %asi is set to
something other than ASI_AIUS (which is userspace) then we branch off
to a routine called memcpy_user_stub().  It just does a straight
memcpy since we are copying from kernel to kernel in this case.

The logic was that since source and destination are both kernel
pointers we don't need to have exception checks.

But for what probe_kernel_{read,write}() is trying to do, we have to
have the checks, otherwise things like kgdb bad kernel pointer
accesses don't do the right thing.

Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-08 22:32:31 -08:00
..
boot sparc,sparc64: unify boot/ 2008-12-04 09:17:21 -08:00
configs eeprom: More consistent symbol names 2009-01-26 21:19:57 +01:00
include/asm sparc64: Implement NMI watchdog on capable cpus. 2009-01-30 00:03:53 -08:00
kernel sparc64: Kill .fixup section bloat. 2009-02-08 22:00:55 -08:00
lib sparc64: Fix probe_kernel_{read,write}(). 2009-02-08 22:32:31 -08:00
math-emu sparc64: unify math-emu 2008-12-04 09:16:56 -08:00
mm sparc64: Kill bogus TPC/address truncation during 32-bit faults. 2009-02-03 16:28:23 -08:00
oprofile sparc64: Implement NMI watchdog on capable cpus. 2009-01-30 00:03:53 -08:00
prom sparc: Eliminate PROMLIB_INTERNAL as it does nothing 2009-01-08 16:59:01 -08:00
Kconfig [CVE-2009-0029] sparc: Enable syscall wrappers for 64-bit 2009-01-19 20:21:49 -08:00
Kconfig.debug sparc: unify Kconfig.debug 2008-12-04 09:16:48 -08:00
Makefile sparc: unify kernel/init_task 2008-12-04 13:28:09 -08:00