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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb: kgdb: Always process the whole breakpoint list on activate or deactivate kgdb: continue and warn on signal passing from gdb kgdb,x86: do not set kgdb_single_step on x86 kgdb: allow for cpu switch when single stepping kgdb,i386: Fix corner case access to ss with NMI watch dog exception kgdb: Replace strstr() by strchr() for single-character needles kgdbts: Read buffer overflow kgdb: Read buffer overflow kgdb,x86: remove redundant test
This commit is contained in:
Linus Torvalds
commit
880188b243
@ -86,9 +86,15 @@ void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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gdb_regs[GDB_DS] = regs->ds;
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gdb_regs[GDB_ES] = regs->es;
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gdb_regs[GDB_CS] = regs->cs;
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gdb_regs[GDB_SS] = __KERNEL_DS;
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gdb_regs[GDB_FS] = 0xFFFF;
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gdb_regs[GDB_GS] = 0xFFFF;
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if (user_mode_vm(regs)) {
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gdb_regs[GDB_SS] = regs->ss;
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gdb_regs[GDB_SP] = regs->sp;
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} else {
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gdb_regs[GDB_SS] = __KERNEL_DS;
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gdb_regs[GDB_SP] = kernel_stack_pointer(regs);
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}
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#else
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gdb_regs[GDB_R8] = regs->r8;
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gdb_regs[GDB_R9] = regs->r9;
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@ -101,8 +107,8 @@ void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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gdb_regs32[GDB_PS] = regs->flags;
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gdb_regs32[GDB_CS] = regs->cs;
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gdb_regs32[GDB_SS] = regs->ss;
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#endif
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gdb_regs[GDB_SP] = kernel_stack_pointer(regs);
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#endif
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}
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/**
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@ -220,8 +226,7 @@ static void kgdb_correct_hw_break(void)
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dr7 |= ((breakinfo[breakno].len << 2) |
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breakinfo[breakno].type) <<
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((breakno << 2) + 16);
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if (breakno >= 0 && breakno <= 3)
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set_debugreg(breakinfo[breakno].addr, breakno);
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set_debugreg(breakinfo[breakno].addr, breakno);
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} else {
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if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
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@ -395,7 +400,6 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
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/* set the trace bit if we're stepping */
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if (remcomInBuffer[0] == 's') {
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linux_regs->flags |= X86_EFLAGS_TF;
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kgdb_single_step = 1;
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atomic_set(&kgdb_cpu_doing_single_step,
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raw_smp_processor_id());
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}
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@ -712,6 +712,12 @@ static int run_simple_test(int is_get_char, int chr)
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/* End of packet == #XX so look for the '#' */
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if (put_buf_cnt > 3 && put_buf[put_buf_cnt - 3] == '#') {
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if (put_buf_cnt >= BUFMAX) {
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eprintk("kgdbts: ERROR: put buffer overflow on"
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" '%s' line %i\n", ts.name, ts.idx);
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put_buf_cnt = 0;
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return 0;
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}
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put_buf[put_buf_cnt] = '\0';
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v2printk("put%i: %s\n", ts.idx, put_buf);
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/* Trigger check here */
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@ -885,16 +891,16 @@ static void kgdbts_run_tests(void)
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int nmi_sleep = 0;
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int i;
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ptr = strstr(config, "F");
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ptr = strchr(config, 'F');
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if (ptr)
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fork_test = simple_strtol(ptr + 1, NULL, 10);
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ptr = strstr(config, "S");
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ptr = strchr(config, 'S');
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if (ptr)
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do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
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ptr = strstr(config, "N");
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ptr = strchr(config, 'N');
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if (ptr)
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nmi_sleep = simple_strtol(ptr+1, NULL, 10);
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ptr = strstr(config, "I");
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ptr = strchr(config, 'I');
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if (ptr)
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sstep_test = simple_strtol(ptr+1, NULL, 10);
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@ -129,6 +129,7 @@ struct task_struct *kgdb_usethread;
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struct task_struct *kgdb_contthread;
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int kgdb_single_step;
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pid_t kgdb_sstep_pid;
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/* Our I/O buffers. */
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static char remcom_in_buffer[BUFMAX];
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@ -541,12 +542,17 @@ static struct task_struct *getthread(struct pt_regs *regs, int tid)
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*/
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if (tid == 0 || tid == -1)
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tid = -atomic_read(&kgdb_active) - 2;
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if (tid < 0) {
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if (tid < -1 && tid > -NR_CPUS - 2) {
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if (kgdb_info[-tid - 2].task)
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return kgdb_info[-tid - 2].task;
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else
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return idle_task(-tid - 2);
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}
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if (tid <= 0) {
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printk(KERN_ERR "KGDB: Internal thread select error\n");
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dump_stack();
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return NULL;
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}
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/*
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* find_task_by_pid_ns() does not take the tasklist lock anymore
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@ -619,7 +625,8 @@ static void kgdb_flush_swbreak_addr(unsigned long addr)
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static int kgdb_activate_sw_breakpoints(void)
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{
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unsigned long addr;
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int error = 0;
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int error;
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int ret = 0;
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int i;
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for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
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@ -629,13 +636,16 @@ static int kgdb_activate_sw_breakpoints(void)
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addr = kgdb_break[i].bpt_addr;
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error = kgdb_arch_set_breakpoint(addr,
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kgdb_break[i].saved_instr);
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if (error)
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return error;
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if (error) {
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ret = error;
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printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
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continue;
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}
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kgdb_flush_swbreak_addr(addr);
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kgdb_break[i].state = BP_ACTIVE;
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}
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return 0;
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return ret;
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}
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static int kgdb_set_sw_break(unsigned long addr)
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@ -682,7 +692,8 @@ static int kgdb_set_sw_break(unsigned long addr)
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static int kgdb_deactivate_sw_breakpoints(void)
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{
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unsigned long addr;
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int error = 0;
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int error;
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int ret = 0;
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int i;
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for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
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@ -691,13 +702,15 @@ static int kgdb_deactivate_sw_breakpoints(void)
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addr = kgdb_break[i].bpt_addr;
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error = kgdb_arch_remove_breakpoint(addr,
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kgdb_break[i].saved_instr);
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if (error)
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return error;
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if (error) {
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printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
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ret = error;
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}
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kgdb_flush_swbreak_addr(addr);
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kgdb_break[i].state = BP_SET;
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}
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return 0;
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return ret;
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}
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static int kgdb_remove_sw_break(unsigned long addr)
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@ -1204,8 +1217,10 @@ static int gdb_cmd_exception_pass(struct kgdb_state *ks)
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return 1;
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} else {
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error_packet(remcom_out_buffer, -EINVAL);
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return 0;
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kgdb_msg_write("KGDB only knows signal 9 (pass)"
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" and 15 (pass and disconnect)\n"
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"Executing a continue without signal passing\n", 0);
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remcom_in_buffer[0] = 'c';
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}
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/* Indicate fall through */
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@ -1395,6 +1410,7 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
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struct kgdb_state kgdb_var;
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struct kgdb_state *ks = &kgdb_var;
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unsigned long flags;
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int sstep_tries = 100;
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int error = 0;
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int i, cpu;
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@ -1425,13 +1441,14 @@ acquirelock:
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cpu_relax();
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/*
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* Do not start the debugger connection on this CPU if the last
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* instance of the exception handler wanted to come into the
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* debugger on a different CPU via a single step
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* For single stepping, try to only enter on the processor
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* that was single stepping. To gaurd against a deadlock, the
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* kernel will only try for the value of sstep_tries before
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* giving up and continuing on.
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*/
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if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
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atomic_read(&kgdb_cpu_doing_single_step) != cpu) {
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(kgdb_info[cpu].task &&
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kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
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atomic_set(&kgdb_active, -1);
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touch_softlockup_watchdog();
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clocksource_touch_watchdog();
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@ -1524,6 +1541,13 @@ acquirelock:
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}
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kgdb_restore:
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if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
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int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
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if (kgdb_info[sstep_cpu].task)
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kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
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else
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kgdb_sstep_pid = 0;
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}
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/* Free kgdb_active */
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atomic_set(&kgdb_active, -1);
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touch_softlockup_watchdog();
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