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@@ -12,6 +12,7 @@
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*/
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#include <linux/ctype.h>
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+#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/kmsg_dump.h>
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@@ -23,6 +24,7 @@
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#include <linux/vmalloc.h>
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#include <linux/atomic.h>
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#include <linux/module.h>
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+#include <linux/moduleparam.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/kallsyms.h>
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@@ -42,6 +44,12 @@
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#include <linux/slab.h>
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#include "kdb_private.h"
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+#undef MODULE_PARAM_PREFIX
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+#define MODULE_PARAM_PREFIX "kdb."
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+
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+static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
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+module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
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+
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#define GREP_LEN 256
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char kdb_grep_string[GREP_LEN];
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int kdb_grepping_flag;
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@@ -121,6 +129,7 @@ static kdbmsg_t kdbmsgs[] = {
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KDBMSG(BADLENGTH, "Invalid length field"),
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KDBMSG(NOBP, "No Breakpoint exists"),
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KDBMSG(BADADDR, "Invalid address"),
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+ KDBMSG(NOPERM, "Permission denied"),
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};
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#undef KDBMSG
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@@ -187,6 +196,26 @@ struct task_struct *kdb_curr_task(int cpu)
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return p;
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}
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+/*
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+ * Check whether the flags of the current command and the permissions
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+ * of the kdb console has allow a command to be run.
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+ */
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+static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
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+ bool no_args)
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+{
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+ /* permissions comes from userspace so needs massaging slightly */
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+ permissions &= KDB_ENABLE_MASK;
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+ permissions |= KDB_ENABLE_ALWAYS_SAFE;
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+
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+ /* some commands change group when launched with no arguments */
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+ if (no_args)
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+ permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
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+
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+ flags |= KDB_ENABLE_ALL;
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+
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+ return permissions & flags;
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+}
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+
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/*
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* kdbgetenv - This function will return the character string value of
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* an environment variable.
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@@ -475,6 +504,15 @@ int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
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char *cp;
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kdb_symtab_t symtab;
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+ /*
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+ * If the enable flags prohibit both arbitrary memory access
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+ * and flow control then there are no reasonable grounds to
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+ * provide symbol lookup.
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+ */
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+ if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
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+ kdb_cmd_enabled, false))
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+ return KDB_NOPERM;
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+
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/*
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* Process arguments which follow the following syntax:
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*
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@@ -641,8 +679,13 @@ static int kdb_defcmd2(const char *cmdstr, const char *argv0)
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if (!s->count)
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s->usable = 0;
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if (s->usable)
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- kdb_register(s->name, kdb_exec_defcmd,
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- s->usage, s->help, 0);
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+ /* macros are always safe because when executed each
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+ * internal command re-enters kdb_parse() and is
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+ * safety checked individually.
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+ */
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+ kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
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+ s->help, 0,
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+ KDB_ENABLE_ALWAYS_SAFE);
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return 0;
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}
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if (!s->usable)
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@@ -1003,25 +1046,22 @@ int kdb_parse(const char *cmdstr)
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if (i < kdb_max_commands) {
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int result;
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+
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+ if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
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+ return KDB_NOPERM;
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+
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KDB_STATE_SET(CMD);
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result = (*tp->cmd_func)(argc-1, (const char **)argv);
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if (result && ignore_errors && result > KDB_CMD_GO)
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result = 0;
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KDB_STATE_CLEAR(CMD);
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- switch (tp->cmd_repeat) {
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- case KDB_REPEAT_NONE:
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- argc = 0;
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- if (argv[0])
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- *(argv[0]) = '\0';
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- break;
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- case KDB_REPEAT_NO_ARGS:
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- argc = 1;
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- if (argv[1])
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- *(argv[1]) = '\0';
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- break;
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- case KDB_REPEAT_WITH_ARGS:
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- break;
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- }
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+
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+ if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
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+ return result;
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+
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+ argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
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+ if (argv[argc])
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+ *(argv[argc]) = '\0';
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return result;
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}
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@@ -1921,10 +1961,14 @@ static int kdb_rm(int argc, const char **argv)
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*/
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static int kdb_sr(int argc, const char **argv)
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{
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+ bool check_mask =
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+ !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
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+
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if (argc != 1)
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return KDB_ARGCOUNT;
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+
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kdb_trap_printk++;
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- __handle_sysrq(*argv[1], false);
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+ __handle_sysrq(*argv[1], check_mask);
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kdb_trap_printk--;
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return 0;
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@@ -2157,6 +2201,8 @@ static void kdb_cpu_status(void)
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for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
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if (!cpu_online(i)) {
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state = 'F'; /* cpu is offline */
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+ } else if (!kgdb_info[i].enter_kgdb) {
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+ state = 'D'; /* cpu is online but unresponsive */
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} else {
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state = ' '; /* cpu is responding to kdb */
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if (kdb_task_state_char(KDB_TSK(i)) == 'I')
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@@ -2210,7 +2256,7 @@ static int kdb_cpu(int argc, const char **argv)
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/*
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* Validate cpunum
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*/
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- if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
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+ if ((cpunum > NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
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return KDB_BADCPUNUM;
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dbg_switch_cpu = cpunum;
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@@ -2375,6 +2421,8 @@ static int kdb_help(int argc, const char **argv)
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return 0;
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if (!kt->cmd_name)
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continue;
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+ if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
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+ continue;
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if (strlen(kt->cmd_usage) > 20)
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space = "\n ";
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kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
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@@ -2629,7 +2677,7 @@ static int kdb_grep_help(int argc, const char **argv)
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}
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/*
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- * kdb_register_repeat - This function is used to register a kernel
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+ * kdb_register_flags - This function is used to register a kernel
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* debugger command.
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* Inputs:
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* cmd Command name
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@@ -2641,12 +2689,12 @@ static int kdb_grep_help(int argc, const char **argv)
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* zero for success, one if a duplicate command.
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*/
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#define kdb_command_extend 50 /* arbitrary */
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-int kdb_register_repeat(char *cmd,
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- kdb_func_t func,
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- char *usage,
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- char *help,
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- short minlen,
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- kdb_repeat_t repeat)
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+int kdb_register_flags(char *cmd,
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+ kdb_func_t func,
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+ char *usage,
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+ char *help,
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+ short minlen,
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+ kdb_cmdflags_t flags)
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{
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int i;
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kdbtab_t *kp;
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@@ -2694,19 +2742,18 @@ int kdb_register_repeat(char *cmd,
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kp->cmd_func = func;
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kp->cmd_usage = usage;
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kp->cmd_help = help;
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- kp->cmd_flags = 0;
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kp->cmd_minlen = minlen;
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- kp->cmd_repeat = repeat;
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+ kp->cmd_flags = flags;
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return 0;
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}
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-EXPORT_SYMBOL_GPL(kdb_register_repeat);
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+EXPORT_SYMBOL_GPL(kdb_register_flags);
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/*
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* kdb_register - Compatibility register function for commands that do
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* not need to specify a repeat state. Equivalent to
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- * kdb_register_repeat with KDB_REPEAT_NONE.
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+ * kdb_register_flags with flags set to 0.
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* Inputs:
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* cmd Command name
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* func Function to execute the command
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@@ -2721,8 +2768,7 @@ int kdb_register(char *cmd,
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char *help,
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short minlen)
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{
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- return kdb_register_repeat(cmd, func, usage, help, minlen,
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- KDB_REPEAT_NONE);
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+ return kdb_register_flags(cmd, func, usage, help, minlen, 0);
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}
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EXPORT_SYMBOL_GPL(kdb_register);
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@@ -2764,80 +2810,109 @@ static void __init kdb_inittab(void)
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for_each_kdbcmd(kp, i)
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kp->cmd_name = NULL;
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- kdb_register_repeat("md", kdb_md, "<vaddr>",
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+ kdb_register_flags("md", kdb_md, "<vaddr>",
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"Display Memory Contents, also mdWcN, e.g. md8c1", 1,
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- KDB_REPEAT_NO_ARGS);
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- kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
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- "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
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- kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
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- "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
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- kdb_register_repeat("mds", kdb_md, "<vaddr>",
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- "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
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- kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
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- "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
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- kdb_register_repeat("go", kdb_go, "[<vaddr>]",
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- "Continue Execution", 1, KDB_REPEAT_NONE);
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- kdb_register_repeat("rd", kdb_rd, "",
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- "Display Registers", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
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- "Modify Registers", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("ef", kdb_ef, "<vaddr>",
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- "Display exception frame", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
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- "Stack traceback", 1, KDB_REPEAT_NONE);
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- kdb_register_repeat("btp", kdb_bt, "<pid>",
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- "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
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- "Backtrace all processes matching state flag", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("btc", kdb_bt, "",
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- "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("btt", kdb_bt, "<vaddr>",
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+ KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
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+ kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
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+ "Display Raw Memory", 0,
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+ KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
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+ kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
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+ "Display Physical Memory", 0,
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+ KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
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+ kdb_register_flags("mds", kdb_md, "<vaddr>",
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+ "Display Memory Symbolically", 0,
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+ KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
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+ kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
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+ "Modify Memory Contents", 0,
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+ KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
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+ kdb_register_flags("go", kdb_go, "[<vaddr>]",
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+ "Continue Execution", 1,
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+ KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
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+ kdb_register_flags("rd", kdb_rd, "",
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+ "Display Registers", 0,
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+ KDB_ENABLE_REG_READ);
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+ kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
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+ "Modify Registers", 0,
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+ KDB_ENABLE_REG_WRITE);
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+ kdb_register_flags("ef", kdb_ef, "<vaddr>",
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+ "Display exception frame", 0,
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+ KDB_ENABLE_MEM_READ);
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+ kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
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+ "Stack traceback", 1,
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+ KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
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+ kdb_register_flags("btp", kdb_bt, "<pid>",
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+ "Display stack for process <pid>", 0,
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+ KDB_ENABLE_INSPECT);
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+ kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
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+ "Backtrace all processes matching state flag", 0,
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+ KDB_ENABLE_INSPECT);
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+ kdb_register_flags("btc", kdb_bt, "",
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+ "Backtrace current process on each cpu", 0,
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+ KDB_ENABLE_INSPECT);
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+ kdb_register_flags("btt", kdb_bt, "<vaddr>",
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"Backtrace process given its struct task address", 0,
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- KDB_REPEAT_NONE);
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- kdb_register_repeat("env", kdb_env, "",
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- "Show environment variables", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("set", kdb_set, "",
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- "Set environment variables", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("help", kdb_help, "",
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- "Display Help Message", 1, KDB_REPEAT_NONE);
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- kdb_register_repeat("?", kdb_help, "",
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- "Display Help Message", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
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- "Switch to new cpu", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("kgdb", kdb_kgdb, "",
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- "Enter kgdb mode", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
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- "Display active task list", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("pid", kdb_pid, "<pidnum>",
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- "Switch to another task", 0, KDB_REPEAT_NONE);
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- kdb_register_repeat("reboot", kdb_reboot, "",
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- "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
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+ KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
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+ kdb_register_flags("env", kdb_env, "",
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+ "Show environment variables", 0,
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+ KDB_ENABLE_ALWAYS_SAFE);
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+ kdb_register_flags("set", kdb_set, "",
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+ "Set environment variables", 0,
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+ KDB_ENABLE_ALWAYS_SAFE);
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+ kdb_register_flags("help", kdb_help, "",
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+ "Display Help Message", 1,
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+ KDB_ENABLE_ALWAYS_SAFE);
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+ kdb_register_flags("?", kdb_help, "",
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+ "Display Help Message", 0,
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+ KDB_ENABLE_ALWAYS_SAFE);
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+ kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
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+ "Switch to new cpu", 0,
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+ KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
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+ kdb_register_flags("kgdb", kdb_kgdb, "",
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+ "Enter kgdb mode", 0, 0);
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+ kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
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+ "Display active task list", 0,
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+ KDB_ENABLE_INSPECT);
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+ kdb_register_flags("pid", kdb_pid, "<pidnum>",
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+ "Switch to another task", 0,
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+ KDB_ENABLE_INSPECT);
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+ kdb_register_flags("reboot", kdb_reboot, "",
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+ "Reboot the machine immediately", 0,
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+ KDB_ENABLE_REBOOT);
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#if defined(CONFIG_MODULES)
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- kdb_register_repeat("lsmod", kdb_lsmod, "",
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- "List loaded kernel modules", 0, KDB_REPEAT_NONE);
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+ kdb_register_flags("lsmod", kdb_lsmod, "",
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+ "List loaded kernel modules", 0,
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+ KDB_ENABLE_INSPECT);
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#endif
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#if defined(CONFIG_MAGIC_SYSRQ)
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- kdb_register_repeat("sr", kdb_sr, "<key>",
|
|
|
- "Magic SysRq key", 0, KDB_REPEAT_NONE);
|
|
|
+ kdb_register_flags("sr", kdb_sr, "<key>",
|
|
|
+ "Magic SysRq key", 0,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
#endif
|
|
|
#if defined(CONFIG_PRINTK)
|
|
|
- kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
|
|
|
- "Display syslog buffer", 0, KDB_REPEAT_NONE);
|
|
|
+ kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
|
|
|
+ "Display syslog buffer", 0,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
#endif
|
|
|
if (arch_kgdb_ops.enable_nmi) {
|
|
|
- kdb_register_repeat("disable_nmi", kdb_disable_nmi, "",
|
|
|
- "Disable NMI entry to KDB", 0, KDB_REPEAT_NONE);
|
|
|
- }
|
|
|
- kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
|
|
|
- "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
|
|
|
- kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
|
|
|
- "Send a signal to a process", 0, KDB_REPEAT_NONE);
|
|
|
- kdb_register_repeat("summary", kdb_summary, "",
|
|
|
- "Summarize the system", 4, KDB_REPEAT_NONE);
|
|
|
- kdb_register_repeat("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
|
|
|
- "Display per_cpu variables", 3, KDB_REPEAT_NONE);
|
|
|
- kdb_register_repeat("grephelp", kdb_grep_help, "",
|
|
|
- "Display help on | grep", 0, KDB_REPEAT_NONE);
|
|
|
+ kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
|
|
|
+ "Disable NMI entry to KDB", 0,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
+ }
|
|
|
+ kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
|
|
|
+ "Define a set of commands, down to endefcmd", 0,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
+ kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
|
|
|
+ "Send a signal to a process", 0,
|
|
|
+ KDB_ENABLE_SIGNAL);
|
|
|
+ kdb_register_flags("summary", kdb_summary, "",
|
|
|
+ "Summarize the system", 4,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
+ kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
|
|
|
+ "Display per_cpu variables", 3,
|
|
|
+ KDB_ENABLE_MEM_READ);
|
|
|
+ kdb_register_flags("grephelp", kdb_grep_help, "",
|
|
|
+ "Display help on | grep", 0,
|
|
|
+ KDB_ENABLE_ALWAYS_SAFE);
|
|
|
}
|
|
|
|
|
|
/* Execute any commands defined in kdb_cmds. */
|
Linus Torvalds