diff options
| -rw-r--r-- | include/linux/kdb.h | 62 | ||||
| -rw-r--r-- | kernel/debug/debug_core.c | 52 | ||||
| -rw-r--r-- | kernel/debug/kdb/kdb_bp.c | 37 | ||||
| -rw-r--r-- | kernel/debug/kdb/kdb_debugger.c | 4 | ||||
| -rw-r--r-- | kernel/debug/kdb/kdb_main.c | 267 | ||||
| -rw-r--r-- | kernel/debug/kdb/kdb_private.h | 3 | ||||
| -rw-r--r-- | kernel/trace/trace_kdb.c | 4 | ||||
| -rw-r--r-- | lib/Kconfig.kgdb | 25 |
8 files changed, 306 insertions, 148 deletions
diff --git a/include/linux/kdb.h b/include/linux/kdb.h index 290db1269c4c..75ae2e2631fc 100644 --- a/include/linux/kdb.h +++ b/include/linux/kdb.h @@ -13,11 +13,54 @@ * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com> */ +/* Shifted versions of the command enable bits are be used if the command + * has no arguments (see kdb_check_flags). This allows commands, such as + * go, to have different permissions depending upon whether it is called + * with an argument. + */ +#define KDB_ENABLE_NO_ARGS_SHIFT 10 + typedef enum { - KDB_REPEAT_NONE = 0, /* Do not repeat this command */ - KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */ - KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */ -} kdb_repeat_t; + KDB_ENABLE_ALL = (1 << 0), /* Enable everything */ + KDB_ENABLE_MEM_READ = (1 << 1), + KDB_ENABLE_MEM_WRITE = (1 << 2), + KDB_ENABLE_REG_READ = (1 << 3), + KDB_ENABLE_REG_WRITE = (1 << 4), + KDB_ENABLE_INSPECT = (1 << 5), + KDB_ENABLE_FLOW_CTRL = (1 << 6), + KDB_ENABLE_SIGNAL = (1 << 7), + KDB_ENABLE_REBOOT = (1 << 8), + /* User exposed values stop here, all remaining flags are + * exclusively used to describe a commands behaviour. + */ + + KDB_ENABLE_ALWAYS_SAFE = (1 << 9), + KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1, + + KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE + << KDB_ENABLE_NO_ARGS_SHIFT, + KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT, + + KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */ + KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */ +} kdb_cmdflags_t; typedef int (*kdb_func_t)(int, const char **); @@ -62,6 +105,7 @@ extern atomic_t kdb_event; #define KDB_BADLENGTH (-19) #define KDB_NOBP (-20) #define KDB_BADADDR (-21) +#define KDB_NOPERM (-22) /* * kdb_diemsg @@ -146,17 +190,17 @@ static inline const char *kdb_walk_kallsyms(loff_t *pos) /* Dynamic kdb shell command registration */ extern int kdb_register(char *, kdb_func_t, char *, char *, short); -extern int kdb_register_repeat(char *, kdb_func_t, char *, char *, - short, kdb_repeat_t); +extern int kdb_register_flags(char *, kdb_func_t, char *, char *, + short, kdb_cmdflags_t); extern int kdb_unregister(char *); #else /* ! CONFIG_KGDB_KDB */ static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } static inline void kdb_init(int level) {} static inline int kdb_register(char *cmd, kdb_func_t func, char *usage, char *help, short minlen) { return 0; } -static inline int kdb_register_repeat(char *cmd, kdb_func_t func, char *usage, - char *help, short minlen, - kdb_repeat_t repeat) { return 0; } +static inline int kdb_register_flags(char *cmd, kdb_func_t func, char *usage, + char *help, short minlen, + kdb_cmdflags_t flags) { return 0; } static inline int kdb_unregister(char *cmd) { return 0; } #endif /* CONFIG_KGDB_KDB */ enum { diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 1adf62b39b96..07ce18ca71e0 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -27,6 +27,9 @@ * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ + +#define pr_fmt(fmt) "KGDB: " fmt + #include <linux/pid_namespace.h> #include <linux/clocksource.h> #include <linux/serial_core.h> @@ -196,8 +199,8 @@ int __weak kgdb_validate_break_address(unsigned long addr) return err; err = kgdb_arch_remove_breakpoint(&tmp); if (err) - printk(KERN_ERR "KGDB: Critical breakpoint error, kernel " - "memory destroyed at: %lx", addr); + pr_err("Critical breakpoint error, kernel memory destroyed at: %lx\n", + addr); return err; } @@ -256,8 +259,8 @@ int dbg_activate_sw_breakpoints(void) error = kgdb_arch_set_breakpoint(&kgdb_break[i]); if (error) { ret = error; - printk(KERN_INFO "KGDB: BP install failed: %lx", - kgdb_break[i].bpt_addr); + pr_info("BP install failed: %lx\n", + kgdb_break[i].bpt_addr); continue; } @@ -319,8 +322,8 @@ int dbg_deactivate_sw_breakpoints(void) continue; error = kgdb_arch_remove_breakpoint(&kgdb_break[i]); if (error) { - printk(KERN_INFO "KGDB: BP remove failed: %lx\n", - kgdb_break[i].bpt_addr); + pr_info("BP remove failed: %lx\n", + kgdb_break[i].bpt_addr); ret = error; } @@ -367,7 +370,7 @@ int dbg_remove_all_break(void) goto setundefined; error = kgdb_arch_remove_breakpoint(&kgdb_break[i]); if (error) - printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n", + pr_err("breakpoint remove failed: %lx\n", kgdb_break[i].bpt_addr); setundefined: kgdb_break[i].state = BP_UNDEFINED; @@ -400,9 +403,9 @@ static int kgdb_io_ready(int print_wait) if (print_wait) { #ifdef CONFIG_KGDB_KDB if (!dbg_kdb_mode) - printk(KERN_CRIT "KGDB: waiting... or $3#33 for KDB\n"); + pr_crit("waiting... or $3#33 for KDB\n"); #else - printk(KERN_CRIT "KGDB: Waiting for remote debugger\n"); + pr_crit("Waiting for remote debugger\n"); #endif } return 1; @@ -430,8 +433,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks) exception_level = 0; kgdb_skipexception(ks->ex_vector, ks->linux_regs); dbg_activate_sw_breakpoints(); - printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n", - addr); + pr_crit("re-enter error: breakpoint removed %lx\n", addr); WARN_ON_ONCE(1); return 1; @@ -444,7 +446,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks) panic("Recursive entry to debugger"); } - printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n"); + pr_crit("re-enter exception: ALL breakpoints killed\n"); #ifdef CONFIG_KGDB_KDB /* Allow kdb to debug itself one level */ return 0; @@ -471,6 +473,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs, int cpu; int trace_on = 0; int online_cpus = num_online_cpus(); + u64 time_left; kgdb_info[ks->cpu].enter_kgdb++; kgdb_info[ks->cpu].exception_state |= exception_state; @@ -595,9 +598,13 @@ return_normal: /* * Wait for the other CPUs to be notified and be waiting for us: */ - while (kgdb_do_roundup && (atomic_read(&masters_in_kgdb) + - atomic_read(&slaves_in_kgdb)) != online_cpus) + time_left = loops_per_jiffy * HZ; + while (kgdb_do_roundup && --time_left && + (atomic_read(&masters_in_kgdb) + atomic_read(&slaves_in_kgdb)) != + online_cpus) cpu_relax(); + if (!time_left) + pr_crit("KGDB: Timed out waiting for secondary CPUs.\n"); /* * At this point the primary processor is completely @@ -795,15 +802,15 @@ static struct console kgdbcons = { static void sysrq_handle_dbg(int key) { if (!dbg_io_ops) { - printk(KERN_CRIT "ERROR: No KGDB I/O module available\n"); + pr_crit("ERROR: No KGDB I/O module available\n"); return; } if (!kgdb_connected) { #ifdef CONFIG_KGDB_KDB if (!dbg_kdb_mode) - printk(KERN_CRIT "KGDB or $3#33 for KDB\n"); + pr_crit("KGDB or $3#33 for KDB\n"); #else - printk(KERN_CRIT "Entering KGDB\n"); + pr_crit("Entering KGDB\n"); #endif } @@ -945,7 +952,7 @@ static void kgdb_initial_breakpoint(void) { kgdb_break_asap = 0; - printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n"); + pr_crit("Waiting for connection from remote gdb...\n"); kgdb_breakpoint(); } @@ -964,8 +971,7 @@ int kgdb_register_io_module(struct kgdb_io *new_dbg_io_ops) if (dbg_io_ops) { spin_unlock(&kgdb_registration_lock); - printk(KERN_ERR "kgdb: Another I/O driver is already " - "registered with KGDB.\n"); + pr_err("Another I/O driver is already registered with KGDB\n"); return -EBUSY; } @@ -981,8 +987,7 @@ int kgdb_register_io_module(struct kgdb_io *new_dbg_io_ops) spin_unlock(&kgdb_registration_lock); - printk(KERN_INFO "kgdb: Registered I/O driver %s.\n", - new_dbg_io_ops->name); + pr_info("Registered I/O driver %s\n", new_dbg_io_ops->name); /* Arm KGDB now. */ kgdb_register_callbacks(); @@ -1017,8 +1022,7 @@ void kgdb_unregister_io_module(struct kgdb_io *old_dbg_io_ops) spin_unlock(&kgdb_registration_lock); - printk(KERN_INFO - "kgdb: Unregistered I/O driver %s, debugger disabled.\n", + pr_info("Unregistered I/O driver %s, debugger disabled\n", old_dbg_io_ops->name); } EXPORT_SYMBOL_GPL(kgdb_unregister_io_module); diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c index b20d544f20c2..e1dbf4a2c69e 100644 --- a/kernel/debug/kdb/kdb_bp.c +++ b/kernel/debug/kdb/kdb_bp.c @@ -531,22 +531,29 @@ void __init kdb_initbptab(void) for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) bp->bp_free = 1; - kdb_register_repeat("bp", kdb_bp, "[<vaddr>]", - "Set/Display breakpoints", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("bl", kdb_bp, "[<vaddr>]", - "Display breakpoints", 0, KDB_REPEAT_NO_ARGS); + kdb_register_flags("bp", kdb_bp, "[<vaddr>]", + "Set/Display breakpoints", 0, + KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS); + kdb_register_flags("bl", kdb_bp, "[<vaddr>]", + "Display breakpoints", 0, + KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS); if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) - kdb_register_repeat("bph", kdb_bp, "[<vaddr>]", - "[datar [length]|dataw [length]] Set hw brk", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("bc", kdb_bc, "<bpnum>", - "Clear Breakpoint", 0, KDB_REPEAT_NONE); - kdb_register_repeat("be", kdb_bc, "<bpnum>", - "Enable Breakpoint", 0, KDB_REPEAT_NONE); - kdb_register_repeat("bd", kdb_bc, "<bpnum>", - "Disable Breakpoint", 0, KDB_REPEAT_NONE); - - kdb_register_repeat("ss", kdb_ss, "", - "Single Step", 1, KDB_REPEAT_NO_ARGS); + kdb_register_flags("bph", kdb_bp, "[<vaddr>]", + "[datar [length]|dataw [length]] Set hw brk", 0, + KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS); + kdb_register_flags("bc", kdb_bc, "<bpnum>", + "Clear Breakpoint", 0, + KDB_ENABLE_FLOW_CTRL); + kdb_register_flags("be", kdb_bc, "<bpnum>", + "Enable Breakpoint", 0, + KDB_ENABLE_FLOW_CTRL); + kdb_register_flags("bd", kdb_bc, "<bpnum>", + "Disable Breakpoint", 0, + KDB_ENABLE_FLOW_CTRL); + + kdb_register_flags("ss", kdb_ss, "", + "Single Step", 1, + KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS); /* * Architecture dependent initialization. */ diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c index 8859ca34dcfe..15e1a7af5dd0 100644 --- a/kernel/debug/kdb/kdb_debugger.c +++ b/kernel/debug/kdb/kdb_debugger.c @@ -129,6 +129,10 @@ int kdb_stub(struct kgdb_state *ks) ks->pass_exception = 1; KDB_FLAG_SET(CATASTROPHIC); } + /* set CATASTROPHIC if the system contains unresponsive processors */ + for_each_online_cpu(i) + if (!kgdb_info[i].enter_kgdb) + KDB_FLAG_SET(CATASTROPHIC); if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) { KDB_STATE_CLEAR(SSBPT); KDB_STATE_CLEAR(DOING_SS); diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index 379650b984f8..f191bddf64b8 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -12,6 +12,7 @@ */ #include <linux/ctype.h> +#include <linux/types.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/kmsg_dump.h> @@ -23,6 +24,7 @@ #include <linux/vmalloc.h> #include <linux/atomic.h> #include <linux/module.h> +#include <linux/moduleparam.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/kallsyms.h> @@ -42,6 +44,12 @@ #include <linux/slab.h> #include "kdb_private.h" +#undef MODULE_PARAM_PREFIX +#define MODULE_PARAM_PREFIX "kdb." + +static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE; +module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600); + #define GREP_LEN 256 char kdb_grep_string[GREP_LEN]; int kdb_grepping_flag; @@ -121,6 +129,7 @@ static kdbmsg_t kdbmsgs[] = { KDBMSG(BADLENGTH, "Invalid length field"), KDBMSG(NOBP, "No Breakpoint exists"), KDBMSG(BADADDR, "Invalid address"), + KDBMSG(NOPERM, "Permission denied"), }; #undef KDBMSG @@ -188,6 +197,26 @@ struct task_struct *kdb_curr_task(int cpu) } /* + * Check whether the flags of the current command and the permissions + * of the kdb console has allow a command to be run. + */ +static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions, + bool no_args) +{ + /* permissions comes from userspace so needs massaging slightly */ + permissions &= KDB_ENABLE_MASK; + permissions |= KDB_ENABLE_ALWAYS_SAFE; + + /* some commands change group when launched with no arguments */ + if (no_args) + permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT; + + flags |= KDB_ENABLE_ALL; + + return permissions & flags; +} + +/* * kdbgetenv - This function will return the character string value of * an environment variable. * Parameters: @@ -476,6 +505,15 @@ int kdbgetaddrarg(int argc, const char **argv, int *nextarg, kdb_symtab_t symtab; /* + * If the enable flags prohibit both arbitrary memory access + * and flow control then there are no reasonable grounds to + * provide symbol lookup. + */ + if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL, + kdb_cmd_enabled, false)) + return KDB_NOPERM; + + /* * Process arguments which follow the following syntax: * * symbol | numeric-address [+/- numeric-offset] @@ -641,8 +679,13 @@ static int kdb_defcmd2(const char *cmdstr, const char *argv0) if (!s->count) s->usable = 0; if (s->usable) - kdb_register(s->name, kdb_exec_defcmd, - s->usage, s->help, 0); + /* macros are always safe because when executed each + * internal command re-enters kdb_parse() and is + * safety checked individually. + */ + kdb_register_flags(s->name, kdb_exec_defcmd, s->usage, + s->help, 0, + KDB_ENABLE_ALWAYS_SAFE); return 0; } if (!s->usable) @@ -1003,25 +1046,22 @@ int kdb_parse(const char *cmdstr) if (i < kdb_max_commands) { int result; + + if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1)) + return KDB_NOPERM; + KDB_STATE_SET(CMD); result = (*tp->cmd_func)(argc-1, (const char **)argv); if (result && ignore_errors && result > KDB_CMD_GO) result = 0; KDB_STATE_CLEAR(CMD); - switch (tp->cmd_repeat) { - case KDB_REPEAT_NONE: - argc = 0; - if (argv[0]) - *(argv[0]) = '\0'; - break; - case KDB_REPEAT_NO_ARGS: - argc = 1; - if (argv[1]) - *(argv[1]) = '\0'; - break; - case KDB_REPEAT_WITH_ARGS: - break; - } + + if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS) + return result; + + argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0; + if (argv[argc]) + *(argv[argc]) = '\0'; return result; } @@ -1921,10 +1961,14 @@ static int kdb_rm(int argc, const char **argv) */ static int kdb_sr(int argc, const char **argv) { + bool check_mask = + !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false); + if (argc != 1) return KDB_ARGCOUNT; + kdb_trap_printk++; - __handle_sysrq(*argv[1], false); + __handle_sysrq(*argv[1], check_mask); kdb_trap_printk--; return 0; @@ -2157,6 +2201,8 @@ static void kdb_cpu_status(void) for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { if (!cpu_online(i)) { state = 'F'; /* cpu is offline */ + } else if (!kgdb_info[i].enter_kgdb) { + state = 'D'; /* cpu is online but unresponsive */ } else { state = ' '; /* cpu is responding to kdb */ if (kdb_task_state_char(KDB_TSK(i)) == 'I') @@ -2210,7 +2256,7 @@ static int kdb_cpu(int argc, const char **argv) /* * Validate cpunum */ - if ((cpunum > NR_CPUS) || !cpu_online(cpunum)) + if ((cpunum > NR_CPUS) || !kgdb_info[cpunum].enter_kgdb) return KDB_BADCPUNUM; dbg_switch_cpu = cpunum; @@ -2375,6 +2421,8 @@ static int kdb_help(int argc, const char **argv) return 0; if (!kt->cmd_name) continue; + if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true)) + continue; if (strlen(kt->cmd_usage) > 20) space = "\n "; kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name, @@ -2629,7 +2677,7 @@ static int kdb_grep_help(int argc, const char **argv) } /* - * kdb_register_repeat - This function is used to register a kernel + * kdb_register_flags - This function is used to register a kernel * debugger command. * Inputs: * cmd Command name @@ -2641,12 +2689,12 @@ static int kdb_grep_help(int argc, const char **argv) * zero for success, one if a duplicate command. */ #define kdb_command_extend 50 /* arbitrary */ -int kdb_register_repeat(char *cmd, - kdb_func_t func, - char *usage, - char *help, - short minlen, - kdb_repeat_t repeat) +int kdb_register_flags(char *cmd, + kdb_func_t func, + char *usage, + char *help, + short minlen, + kdb_cmdflags_t flags) { int i; kdbtab_t *kp; @@ -2694,19 +2742,18 @@ int kdb_register_repeat(char *cmd, kp->cmd_func = func; kp->cmd_usage = usage; kp->cmd_help = help; - kp->cmd_flags = 0; kp->cmd_minlen = minlen; - kp->cmd_repeat = repeat; + kp->cmd_flags = flags; return 0; } -EXPORT_SYMBOL_GPL(kdb_register_repeat); +EXPORT_SYMBOL_GPL(kdb_register_flags); /* * kdb_register - Compatibility register function for commands that do * not need to specify a repeat state. Equivalent to - * kdb_register_repeat with KDB_REPEAT_NONE. + * kdb_register_flags with flags set to 0. * Inputs: * cmd Command name * func Function to execute the command @@ -2721,8 +2768,7 @@ int kdb_register(char *cmd, char *help, short minlen) { - return kdb_register_repeat(cmd, func, usage, help, minlen, - KDB_REPEAT_NONE); + return kdb_register_flags(cmd, func, usage, help, minlen, 0); } EXPORT_SYMBOL_GPL(kdb_register); @@ -2764,80 +2810,109 @@ static void __init kdb_inittab(void) for_each_kdbcmd(kp, i) kp->cmd_name = NULL; - kdb_register_repeat("md", kdb_md, "<vaddr>", + kdb_register_flags("md", kdb_md, "<vaddr>", "Display Memory Contents, also mdWcN, e.g. md8c1", 1, - KDB_REPEAT_NO_ARGS); - kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>", - "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>", - "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("mds", kdb_md, "<vaddr>", - "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>", - "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS); - kdb_register_repeat("go", kdb_go, "[<vaddr>]", - "Continue Execution", 1, KDB_REPEAT_NONE); - kdb_register_repeat("rd", kdb_rd, "", - "Display Registers", 0, KDB_REPEAT_NONE); - kdb_register_repeat("rm", kdb_rm, "<reg> <contents>", - "Modify Registers", 0, KDB_REPEAT_NONE); - kdb_register_repeat("ef", kdb_ef, "<vaddr>", - "Display exception frame", 0, KDB_REPEAT_NONE); - kdb_register_repeat("bt", kdb_bt, "[<vaddr>]", - "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, "[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>", + KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); + kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>", + "Display Raw Memory", 0, + KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); + kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>", + "Display Physical Memory", 0, + KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); + kdb_register_flags("mds", kdb_md, "<vaddr>", + "Display Memory Symbolically", 0, + KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); + kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>", + "Modify Memory Contents", 0, + KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS); + kdb_register_flags("go", kdb_go, "[<vaddr>]", + "Continue Execution", 1, + KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS); + kdb_register_flags("rd", kdb_rd, "", + "Display Registers", 0, + KDB_ENABLE_REG_READ); + kdb_register_flags("rm", kdb_rm, "<reg> <contents>", + "Modify Registers", 0, + KDB_ENABLE_REG_WRITE); + kdb_register_flags("ef", kdb_ef, "<vaddr>", + "Display exception frame", 0, + KDB_ENABLE_MEM_READ); + kdb_register_flags("bt", kdb_bt, "[<vaddr>]", + "Stack traceback", 1, + KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS); + kdb_register_flags("btp", kdb_bt, "<pid>", + "Display stack for process <pid>", 0, + KDB_ENABLE_INSPECT); + kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]", + "Backtrace all processes matching state flag", 0, + KDB_ENABLE_INSPECT); + kdb_register_flags("btc", kdb_bt, "", + "Backtrace current process on each cpu", 0, + KDB_ENABLE_INSPECT); + kdb_register_flags("btt", kdb_bt, "<vaddr>", "Backtrace process given its struct task address", 0, - KDB_REPEAT_NONE); - kdb_register_repeat("env", kdb_env, "", - "Show environment variables", 0, KDB_REPEAT_NONE); - kdb_register_repeat("set", kdb_set, "", - "Set environment variables", 0, KDB_REPEAT_NONE); - kdb_register_repeat("help", kdb_help, "", - "Display Help Message", 1, KDB_REPEAT_NONE); - kdb_register_repeat("?", kdb_help, "", - "Display Help Message", 0, KDB_REPEAT_NONE); - kdb_register_repeat("cpu", kdb_cpu, "<cpunum>", - "Switch to new cpu", 0, KDB_REPEAT_NONE); - kdb_register_repeat("kgdb", kdb_kgdb, "", - "Enter kgdb mode", 0, KDB_REPEAT_NONE); - kdb_register_repeat("ps", kdb_ps, "[<flags>|A]", - "Display active task list", 0, KDB_REPEAT_NONE); - kdb_register_repeat("pid", kdb_pid, "<pidnum>", - "Switch to another task", 0, KDB_REPEAT_NONE); - kdb_register_repeat("reboot", kdb_reboot, "", - "Reboot the machine immediately", 0, KDB_REPEAT_NONE); + KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS); + kdb_register_flags("env", kdb_env, "", + "Show environment variables", 0, + KDB_ENABLE_ALWAYS_SAFE); + kdb_register_flags("set", kdb_set, "", + "Set environment variables", 0, + KDB_ENABLE_ALWAYS_SAFE); + kdb_register_flags("help", kdb_help, "", + "Display Help Message", 1, + KDB_ENABLE_ALWAYS_SAFE); + kdb_register_flags("?", kdb_help, "", + "Display Help Message", 0, + KDB_ENABLE_ALWAYS_SAFE); + kdb_register_flags("cpu", kdb_cpu, "<cpunum>", + "Switch to new cpu", 0, + KDB_ENABLE_ALWAYS_SAFE_NO_ARGS); + kdb_register_flags("kgdb", kdb_kgdb, "", + "Enter kgdb mode", 0, 0); + kdb_register_flags("ps", kdb_ps, "[<flags>|A]", + "Display active task list", 0, + KDB_ENABLE_INSPECT); + kdb_register_flags("pid", kdb_pid, "<pidnum>", + "Switch to another task", 0, + KDB_ENABLE_INSPECT); + kdb_register_flags("reboot", kdb_reboot, "", + "Reboot the machine immediately", 0, + KDB_ENABLE_REBOOT); #if defined(CONFIG_MODULES) - kdb_register_repeat("lsmod", kdb_lsmod, "", - "List loaded kernel modules", 0, KDB_REPEAT_NONE); + kdb_register_flags("lsmod", kdb_lsmod, "", + "List loaded kernel modules", 0, + KDB_ENABLE_INSPECT); #endif #if defined(CONFIG_MAGIC_SYSRQ) - 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. */ diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h index 7afd3c8c41d5..eaacd1693954 100644 --- a/kernel/debug/kdb/kdb_private.h +++ b/kernel/debug/kdb/kdb_private.h @@ -172,10 +172,9 @@ typedef struct _kdbtab { kdb_func_t cmd_func; /* Function to execute command */ char *cmd_usage; /* Usage String for this command */ char *cmd_help; /* Help message for this command */ - short cmd_flags; /* Parsing flags */ short cmd_minlen; /* Minimum legal # command * chars required */ - kdb_repeat_t cmd_repeat; /* Does command auto repeat on enter? */ + kdb_cmdflags_t cmd_flags; /* Command behaviour flags */ } kdbtab_t; extern int kdb_bt(int, const char **); /* KDB display back trace */ diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c index b0b1c44e923a..3ccf5c2c1320 100644 --- a/kernel/trace/trace_kdb.c +++ b/kernel/trace/trace_kdb.c @@ -132,8 +132,8 @@ static int kdb_ftdump(int argc, const char **argv) static __init int kdb_ftrace_register(void) { - kdb_register_repeat("ftdump", kdb_ftdump, "[skip_#lines] [cpu]", - "Dump ftrace log", 0, KDB_REPEAT_NONE); + kdb_register_flags("ftdump", kdb_ftdump, "[skip_#lines] [cpu]", + "Dump ftrace log", 0, KDB_ENABLE_ALWAYS_SAFE); return 0; } diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb index 358eb81fa28d..c635a107a7de 100644 --- a/lib/Kconfig.kgdb +++ b/lib/Kconfig.kgdb @@ -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 |