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authorLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 12:47:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 12:47:18 -0700
commit49dc6fbce33011733601e4e81c551e066f1682fc (patch)
treed23df2a2d5f655597c1882c8c345f29ec4668e2c /lib
parent09a31a7e3723afd79022d5d3ff3634c2630c2eeb (diff)
parentd081a6e353168f15e63eb9e9334757f20343319f (diff)
Merge tag 'kgdb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
Pull kgdb updates from Daniel Thompson: "A fairly modest set of changes for this cycle. Of particular note are an earlycon fix from Doug Anderson and my own changes to get kgdb/kdb to honour the kprobe blocklist. The later creates a safety rail that strongly encourages developers not to place breakpoints in, for example, arch specific trap handling code. Also included are a couple of small fixes and tweaks: an API update, eliminate a coverity dead code warning, improved handling of search during multi-line printk and a couple of typo corrections" * tag 'kgdb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux: kdb: Fix pager search for multi-line strings kernel: debug: Centralize dbg_[de]activate_sw_breakpoints kgdb: Add NOKPROBE labels on the trap handler functions kgdb: Honour the kprobe blocklist when setting breakpoints kernel/debug: Fix spelling mistake in debug_core.c kdb: Use newer api for tasklist scanning kgdb: Make "kgdbcon" work properly with "kgdb_earlycon" kdb: remove unnecessary null check of dbg_io_ops
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.kgdb15
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 256f2486f9bd..05dae05b6cc9 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -24,6 +24,21 @@ menuconfig KGDB
if KGDB
+config KGDB_HONOUR_BLOCKLIST
+ bool "KGDB: use kprobe blocklist to prohibit unsafe breakpoints"
+ depends on HAVE_KPROBES
+ depends on MODULES
+ select KPROBES
+ default y
+ help
+ If set to Y the debug core will use the kprobe blocklist to
+ identify symbols where it is unsafe to set breakpoints.
+ In particular this disallows instrumentation of functions
+ called during debug trap handling and thus makes it very
+ difficult to inadvertently provoke recursive trap handling.
+
+ If unsure, say Y.
+
config KGDB_SERIAL_CONSOLE
tristate "KGDB: use kgdb over the serial console"
select CONSOLE_POLL

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