linux/kernel/debug/kdb
Sumit Garg 93f7a6d818 kdb: Make memory allocations more robust
Currently kdb uses in_interrupt() to determine whether its library
code has been called from the kgdb trap handler or from a saner calling
context such as driver init. This approach is broken because
in_interrupt() alone isn't able to determine kgdb trap handler entry from
normal task context. This can happen during normal use of basic features
such as breakpoints and can also be trivially reproduced using:
echo g > /proc/sysrq-trigger

We can improve this by adding check for in_dbg_master() instead which
explicitly determines if we are running in debugger context.

Cc: stable@vger.kernel.org
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/1611313556-4004-1-git-send-email-sumit.garg@linaro.org
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
2021-02-08 13:42:50 +00:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
kdb_bp.c kgdb: Honour the kprobe blocklist when setting breakpoints 2020-09-28 12:14:08 +01:00
kdb_bt.c kdb: Use newer api for tasklist scanning 2020-09-08 14:36:46 +01:00
kdb_cmds
kdb_debugger.c kernel: debug: Centralize dbg_[de]activate_sw_breakpoints 2020-10-01 14:23:45 +01:00
kdb_io.c kdb: Fix pager search for multi-line strings 2020-10-01 14:44:08 +01:00
kdb_keyboard.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
kdb_main.c kdb: Use newer api for tasklist scanning 2020-09-08 14:36:46 +01:00
kdb_private.h kdb: Make memory allocations more robust 2021-02-08 13:42:50 +00:00
kdb_support.c kdb: kdb_support: Fix debugging information problem 2021-02-04 15:55:04 +00:00
Makefile kdb: Get rid of broken attempt to print CCVERSION in kdb summary 2019-05-12 09:50:43 +01:00