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kdb: Prevent kernel oops with kdb_defcmd 

The kdb_defcmd can only be used to display the available command aliases
while using the kernel debug shell.  If you try to define a new macro
while the kernel debugger is active it will oops.  The debug shell
macros must use pre-allocated memory set aside at the time kdb_init()
is run, and the kdb_defcmd is restricted to only working at the time
that the kdb_init sequence is being run, which only occurs if you
actually activate the kernel debugger.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2013-02-04 10:35:33 -06:00
parent 1b2caa2dcb
commit a37372f6c3
1 changed files with 6 additions and 2 deletions
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8
kernel/debug/kdb/kdb_main.c
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@ -681,6 +681,10 @@ static int kdb_defcmd(int argc, const char **argv)
}
if (argc != 3)
return KDB_ARGCOUNT;
if (in_dbg_master()) {
kdb_printf("Command only available during kdb_init()\n");
return KDB_NOTIMP;
}
defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
GFP_KDB);
if (!defcmd_set)
@ -2796,8 +2800,8 @@ static void __init kdb_inittab(void)
"Stack traceback", 1, KDB_REPEAT_NONE);
kdb_register_repeat("btp", kdb_bt, "<pid>",
"Display stack for process <pid>", 0, KDB_REPEAT_NONE);
kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
"Display stack all processes", 0, KDB_REPEAT_NONE);
kdb_register_repeat("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
"Backtrace all processes matching state flag", 0, KDB_REPEAT_NONE);
kdb_register_repeat("btc", kdb_bt, "",
"Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
kdb_register_repeat("btt", kdb_bt, "<vaddr>",