linux-stable/kernel/debug
Daniel Thompson c1cb81429d kdb: Fix the putarea helper function
Currently kdb_putarea_size() uses copy_from_kernel_nofault() to write *to*
arbitrary kernel memory. This is obviously wrong and means the memory
modify ('mm') command is a serious risk to debugger stability: if we poke
to a bad address we'll double-fault and lose our debug session.

Fix this the (very) obvious way.

Note that there are two Fixes: tags because the API was renamed and this
patch will only trivially backport as far as the rename (and this is
probably enough). Nevertheless Christoph's rename did not introduce this
problem so I wanted to record that!

Fixes: fe557319aa ("maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault")
Fixes: 5d5314d679 ("kdb: core for kgdb back end (1 of 2)")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20220128144055.207267-1-daniel.thompson@linaro.org
2022-03-24 16:39:47 +00:00
..
kdb kdb: Fix the putarea helper function 2022-03-24 16:39:47 +00:00
debug_core.c kernel: debug: Convert to SPDX identifier 2021-09-06 14:31:11 +01:00
debug_core.h kdb: Fix stack crawling on 'running' CPUs that aren't the master 2019-10-10 16:28:48 +01:00
gdbstub.c kernel: debug: Convert to SPDX identifier 2021-09-06 14:31:11 +01:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00