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kdb: Allow access to sensitive commands to be restricted by default

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Currently kiosk mode must be explicitly requested by the bootloader or
userspace. It is convenient to be able to change the default value in a
similar manner to CONFIG_MAGIC_SYSRQ_DEFAULT_MASK.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Daniel Thompson 2014-11-06 14:36:47 +00:00 committed by Jason Wessel
parent 420c2b1b0d
commit b8017177cd
2 changed files with 26 additions and 1 deletions
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2
kernel/debug/kdb/kdb_main.c
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@ -47,7 +47,7 @@
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX "kdb."
static int kdb_cmd_enabled;
static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
#define GREP_LEN 256

25
lib/Kconfig.kgdb
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@ -73,6 +73,31 @@ config KGDB_KDB
help
KDB frontend for kernel
config KDB_DEFAULT_ENABLE
hex "KDB: Select kdb command functions to be enabled by default"
depends on KGDB_KDB
default 0x1
help
Specifiers which kdb commands are enabled by default. This may
be set to 1 or 0 to enable all commands or disable almost all
commands.
Alternatively the following bitmask applies:
0x0002 - allow arbitrary reads from memory and symbol lookup
0x0004 - allow arbitrary writes to memory
0x0008 - allow current register state to be inspected
0x0010 - allow current register state to be modified
0x0020 - allow passive inspection (backtrace, process list, lsmod)
0x0040 - allow flow control management (breakpoint, single step)
0x0080 - enable signalling of processes
0x0100 - allow machine to be rebooted
The config option merely sets the default at boot time. Both
issuing 'echo X > /sys/module/kdb/parameters/cmd_enable' or
setting with kdb.cmd_enable=X kernel command line option will
override the default settings.
config KDB_KEYBOARD
bool "KGDB_KDB: keyboard as input device"
depends on VT && KGDB_KDB