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KGDB/KDB regression fixes

Browse Source 
3.4: Fix an an Smatch warning that appeared in the 3.4 merge window
    3.0: Fix kgdb test suite with SMP for all archs without HW single stepping
 2.6.36: Fix kgdb sw breakpoints with CONFIG_DEBUG_RODATA=y limitations on x86
 2.6.26: Fix oops on kgdb test suite with CONFIG_DEBUG_RODATA
         Fix kgdb test suite with SMP for all archs with HW single stepping
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Merge tag 'for_linus-3.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

Pull KGDB/KDB regression fixes from Jason Wessel:
 - Fix a Smatch warning that appeared in the 3.4 merge window
 - Fix kgdb test suite with SMP for all archs without HW single stepping
 - Fix kgdb sw breakpoints with CONFIG_DEBUG_RODATA=y limitations on x86
 - Fix oops on kgdb test suite with CONFIG_DEBUG_RODATA
 - Fix kgdb test suite with SMP for all archs with HW single stepping

* tag 'for_linus-3.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb:
  x86,kgdb: Fix DEBUG_RODATA limitation using text_poke()
  kgdb,debug_core: pass the breakpoint struct instead of address and memory
  kgdbts: (2 of 2) fix single step awareness to work correctly with SMP
  kgdbts: (1 of 2) fix single step awareness to work correctly with SMP
  kgdbts: Fix kernel oops with CONFIG_DEBUG_RODATA
  kdb: Fix smatch warning on dbg_io_ops->is_console
This commit is contained in:
Linus Torvalds 2012-04-04 17:26:08 -07:00
commit 6c216ec636
5 changed files with 204 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
arch/x86/kernel/kgdb.c
View File

@ -43,6 +43,8 @@
#include <linux/smp.h>
#include <linux/nmi.h>
#include <linux/hw_breakpoint.h>
#include <linux/uaccess.h>
#include <linux/memory.h>
#include <asm/debugreg.h>
#include <asm/apicdef.h>
@ -741,6 +743,64 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
regs->ip = ip;
}
int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
char opc[BREAK_INSTR_SIZE];
bpt->type = BP_BREAKPOINT;
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
err = probe_kernel_write((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
#ifdef CONFIG_DEBUG_RODATA
if (!err)
return err;
/*
* It is safe to call text_poke() because normal kernel execution
* is stopped on all cores, so long as the text_mutex is not locked.
*/
if (mutex_is_locked(&text_mutex))
return -EBUSY;
text_poke((void *)bpt->bpt_addr, arch_kgdb_ops.gdb_bpt_instr,
BREAK_INSTR_SIZE);
err = probe_kernel_read(opc, (char *)bpt->bpt_addr, BREAK_INSTR_SIZE);
if (err)
return err;
if (memcmp(opc, arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE))
return -EINVAL;
bpt->type = BP_POKE_BREAKPOINT;
#endif /* CONFIG_DEBUG_RODATA */
return err;
}
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
#ifdef CONFIG_DEBUG_RODATA
int err;
char opc[BREAK_INSTR_SIZE];
if (bpt->type != BP_POKE_BREAKPOINT)
goto knl_write;
/*
* It is safe to call text_poke() because normal kernel execution
* is stopped on all cores, so long as the text_mutex is not locked.
*/
if (mutex_is_locked(&text_mutex))
goto knl_write;
text_poke((void *)bpt->bpt_addr, bpt->saved_instr, BREAK_INSTR_SIZE);
err = probe_kernel_read(opc, (char *)bpt->bpt_addr, BREAK_INSTR_SIZE);
if (err || memcmp(opc, bpt->saved_instr, BREAK_INSTR_SIZE))
goto knl_write;
return err;
knl_write:
#endif /* CONFIG_DEBUG_RODATA */
return probe_kernel_write((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}
struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: */
.gdb_bpt_instr = { 0xcc },

160
drivers/misc/kgdbts.c
View File

@ -134,12 +134,17 @@ static int force_hwbrks;
static int hwbreaks_ok;
static int hw_break_val;
static int hw_break_val2;
static int cont_instead_of_sstep;
static unsigned long cont_thread_id;
static unsigned long sstep_thread_id;
#if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || defined(CONFIG_SPARC)
static int arch_needs_sstep_emulation = 1;
#else
static int arch_needs_sstep_emulation;
#endif
static unsigned long cont_addr;
static unsigned long sstep_addr;
static int restart_from_top_after_write;
static int sstep_state;
/* Storage for the registers, in GDB format. */
@ -187,7 +192,8 @@ static int kgdbts_unreg_thread(void *ptr)
*/
while (!final_ack)
msleep_interruptible(1500);
/* Pause for any other threads to exit after final ack. */
msleep_interruptible(1000);
if (configured)
kgdb_unregister_io_module(&kgdbts_io_ops);
configured = 0;
@ -211,7 +217,7 @@ static unsigned long lookup_addr(char *arg)
if (!strcmp(arg, "kgdbts_break_test"))
addr = (unsigned long)kgdbts_break_test;
else if (!strcmp(arg, "sys_open"))
addr = (unsigned long)sys_open;
addr = (unsigned long)do_sys_open;
else if (!strcmp(arg, "do_fork"))
addr = (unsigned long)do_fork;
else if (!strcmp(arg, "hw_break_val"))
@ -283,6 +289,16 @@ static void hw_break_val_write(void)
hw_break_val++;
}
static int get_thread_id_continue(char *put_str, char *arg)
{
char *ptr = &put_str[11];
if (put_str[1] != 'T' || put_str[2] != '0')
return 1;
kgdb_hex2long(&ptr, &cont_thread_id);
return 0;
}
static int check_and_rewind_pc(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
@ -299,13 +315,21 @@ static int check_and_rewind_pc(char *put_str, char *arg)
if (addr + BREAK_INSTR_SIZE == ip)
offset = -BREAK_INSTR_SIZE;
#endif
if (strcmp(arg, "silent") && ip + offset != addr) {
if (arch_needs_sstep_emulation && sstep_addr &&
ip + offset == sstep_addr &&
((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
/* This is special case for emulated single step */
v2printk("Emul: rewind hit single step bp\n");
restart_from_top_after_write = 1;
} else if (strcmp(arg, "silent") && ip + offset != addr) {
eprintk("kgdbts: BP mismatch %lx expected %lx\n",
ip + offset, addr);
return 1;
}
/* Readjust the instruction pointer if needed */
ip += offset;
cont_addr = ip;
#ifdef GDB_ADJUSTS_BREAK_OFFSET
instruction_pointer_set(&kgdbts_regs, ip);
#endif
@ -315,6 +339,8 @@ static int check_and_rewind_pc(char *put_str, char *arg)
static int check_single_step(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
static int matched_id;
/*
* From an arch indepent point of view the instruction pointer
* should be on a different instruction
@ -324,6 +350,29 @@ static int check_single_step(char *put_str, char *arg)
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Singlestep stopped at IP: %lx\n",
instruction_pointer(&kgdbts_regs));
if (sstep_thread_id != cont_thread_id) {
/*
* Ensure we stopped in the same thread id as before, else the
* debugger should continue until the original thread that was
* single stepped is scheduled again, emulating gdb's behavior.
*/
v2printk("ThrID does not match: %lx\n", cont_thread_id);
if (arch_needs_sstep_emulation) {
if (matched_id &&
instruction_pointer(&kgdbts_regs) != addr)
goto continue_test;
matched_id++;
ts.idx -= 2;
sstep_state = 0;
return 0;
}
cont_instead_of_sstep = 1;
ts.idx -= 4;
return 0;
}
continue_test:
matched_id = 0;
if (instruction_pointer(&kgdbts_regs) == addr) {
eprintk("kgdbts: SingleStep failed at %lx\n",
instruction_pointer(&kgdbts_regs));
@ -365,10 +414,40 @@ static int got_break(char *put_str, char *arg)
return 1;
}
static void get_cont_catch(char *arg)
{
/* Always send detach because the test is completed at this point */
fill_get_buf("D");
}
static int put_cont_catch(char *put_str, char *arg)
{
/* This is at the end of the test and we catch any and all input */
v2printk("kgdbts: cleanup task: %lx\n", sstep_thread_id);
ts.idx--;
return 0;
}
static int emul_reset(char *put_str, char *arg)
{
if (strncmp(put_str, "$OK", 3))
return 1;
if (restart_from_top_after_write) {
restart_from_top_after_write = 0;
ts.idx = -1;
}
return 0;
}
static void emul_sstep_get(char *arg)
{
if (!arch_needs_sstep_emulation) {
fill_get_buf(arg);
if (cont_instead_of_sstep) {
cont_instead_of_sstep = 0;
fill_get_buf("c");
} else {
fill_get_buf(arg);
}
return;
}
switch (sstep_state) {
@ -398,9 +477,11 @@ static void emul_sstep_get(char *arg)
static int emul_sstep_put(char *put_str, char *arg)
{
if (!arch_needs_sstep_emulation) {
if (!strncmp(put_str+1, arg, 2))
return 0;
return 1;
char *ptr = &put_str[11];
if (put_str[1] != 'T' || put_str[2] != '0')
return 1;
kgdb_hex2long(&ptr, &sstep_thread_id);
return 0;
}
switch (sstep_state) {
case 1:
@ -411,8 +492,7 @@ static int emul_sstep_put(char *put_str, char *arg)
v2printk("Stopped at IP: %lx\n",
instruction_pointer(&kgdbts_regs));
/* Want to stop at IP + break instruction size by default */
sstep_addr = instruction_pointer(&kgdbts_regs) +
BREAK_INSTR_SIZE;
sstep_addr = cont_addr + BREAK_INSTR_SIZE;
break;
case 2:
if (strncmp(put_str, "$OK", 3)) {
@ -424,6 +504,9 @@ static int emul_sstep_put(char *put_str, char *arg)
if (strncmp(put_str, "$T0", 3)) {
eprintk("kgdbts: failed continue sstep\n");
return 1;
} else {
char *ptr = &put_str[11];
kgdb_hex2long(&ptr, &sstep_thread_id);
}
break;
case 4:
@ -502,10 +585,10 @@ static struct test_struct bad_read_test[] = {
static struct test_struct singlestep_break_test[] = {
{ "?", "S0*" }, /* Clear break points */
{ "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
{ "c", "T0*", }, /* Continue */
{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
{ "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
{ "g", "kgdbts_break_test", NULL, check_and_rewind_pc },
{ "write", "OK", write_regs }, /* Write registers */
{ "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
{ "g", "kgdbts_break_test", NULL, check_single_step },
{ "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
@ -523,16 +606,16 @@ static struct test_struct singlestep_break_test[] = {
static struct test_struct do_fork_test[] = {
{ "?", "S0*" }, /* Clear break points */
{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
{ "c", "T0*", }, /* Continue */
{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
{ "write", "OK", write_regs }, /* Write registers */
{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
{ "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
{ "write", "OK", write_regs, emul_reset }, /* Write registers */
{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
{ "g", "do_fork", NULL, check_single_step },
{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
{ "", "" },
{ "", "", get_cont_catch, put_cont_catch },
};
/* Test for hitting a breakpoint at sys_open for what ever the number
@ -541,16 +624,16 @@ static struct test_struct do_fork_test[] = {
static struct test_struct sys_open_test[] = {
{ "?", "S0*" }, /* Clear break points */
{ "sys_open", "OK", sw_break, }, /* set sw breakpoint */
{ "c", "T0*", }, /* Continue */
{ "g", "sys_open", NULL, check_and_rewind_pc }, /* check location */
{ "write", "OK", write_regs }, /* Write registers */
{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
{ "sys_open", "OK", sw_rem_break }, /*remove breakpoint */
{ "g", "sys_open", NULL, check_and_rewind_pc }, /* check location */
{ "write", "OK", write_regs, emul_reset }, /* Write registers */
{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
{ "g", "sys_open", NULL, check_single_step },
{ "sys_open", "OK", sw_break, }, /* set sw breakpoint */
{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
{ "", "" },
{ "", "", get_cont_catch, put_cont_catch },
};
/*
@ -693,8 +776,8 @@ static int run_simple_test(int is_get_char, int chr)
/* This callback is a put char which is when kgdb sends data to
* this I/O module.
*/
if (ts.tst[ts.idx].get[0] == '\0' &&
ts.tst[ts.idx].put[0] == '\0') {
if (ts.tst[ts.idx].get[0] == '\0' && ts.tst[ts.idx].put[0] == '\0' &&
!ts.tst[ts.idx].get_handler) {
eprintk("kgdbts: ERROR: beyond end of test on"
" '%s' line %i\n", ts.name, ts.idx);
return 0;
@ -907,6 +990,17 @@ static void kgdbts_run_tests(void)
if (ptr)
sstep_test = simple_strtol(ptr+1, NULL, 10);
/* All HW break point tests */
if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) {
hwbreaks_ok = 1;
v1printk("kgdbts:RUN hw breakpoint test\n");
run_breakpoint_test(1);
v1printk("kgdbts:RUN hw write breakpoint test\n");
run_hw_break_test(1);
v1printk("kgdbts:RUN access write breakpoint test\n");
run_hw_break_test(0);
}
/* required internal KGDB tests */
v1printk("kgdbts:RUN plant and detach test\n");
run_plant_and_detach_test(0);
@ -924,35 +1018,11 @@ static void kgdbts_run_tests(void)
/* ===Optional tests=== */
/* All HW break point tests */
if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) {
hwbreaks_ok = 1;
v1printk("kgdbts:RUN hw breakpoint test\n");
run_breakpoint_test(1);
v1printk("kgdbts:RUN hw write breakpoint test\n");
run_hw_break_test(1);
v1printk("kgdbts:RUN access write breakpoint test\n");
run_hw_break_test(0);
}
if (nmi_sleep) {
v1printk("kgdbts:RUN NMI sleep %i seconds test\n", nmi_sleep);
run_nmi_sleep_test(nmi_sleep);
}
#ifdef CONFIG_DEBUG_RODATA
/* Until there is an api to write to read-only text segments, use
* HW breakpoints for the remainder of any tests, else print a
* failure message if hw breakpoints do not work.
*/
if (!(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT && hwbreaks_ok)) {
eprintk("kgdbts: HW breakpoints do not work,"
"skipping remaining tests\n");
return;
}
force_hwbrks = 1;
#endif /* CONFIG_DEBUG_RODATA */
/* If the do_fork test is run it will be the last test that is
* executed because a kernel thread will be spawned at the very
* end to unregister the debug hooks.

7
include/linux/kgdb.h
View File

@ -63,7 +63,8 @@ enum kgdb_bptype {
BP_HARDWARE_BREAKPOINT,
BP_WRITE_WATCHPOINT,
BP_READ_WATCHPOINT,
BP_ACCESS_WATCHPOINT
BP_ACCESS_WATCHPOINT,
BP_POKE_BREAKPOINT,
};
enum kgdb_bpstate {
@ -207,8 +208,8 @@ extern void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc);
/* Optional functions. */
extern int kgdb_validate_break_address(unsigned long addr);
extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr);
extern int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle);
extern int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt);
extern int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt);
/**
* kgdb_arch_late - Perform any architecture specific initalization.

53
kernel/debug/debug_core.c
View File

@ -160,37 +160,39 @@ early_param("nokgdbroundup", opt_nokgdbroundup);
* Weak aliases for breakpoint management,
* can be overriden by architectures when needed:
*/
int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
int __weak kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
BREAK_INSTR_SIZE);
err = probe_kernel_write((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
return err;
}
int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
int __weak kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
return probe_kernel_write((char *)addr,
(char *)bundle, BREAK_INSTR_SIZE);
return probe_kernel_write((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}
int __weak kgdb_validate_break_address(unsigned long addr)
{
char tmp_variable[BREAK_INSTR_SIZE];
struct kgdb_bkpt tmp;
int err;
/* Validate setting the breakpoint and then removing it. In the
/* Validate setting the breakpoint and then removing it. If the
* remove fails, the kernel needs to emit a bad message because we
* are deep trouble not being able to put things back the way we
* found them.
*/
err = kgdb_arch_set_breakpoint(addr, tmp_variable);
tmp.bpt_addr = addr;
err = kgdb_arch_set_breakpoint(&tmp);
if (err)
return err;
err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
err = kgdb_arch_remove_breakpoint(&tmp);
if (err)
printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
"memory destroyed at: %lx", addr);
@ -234,7 +236,6 @@ static void kgdb_flush_swbreak_addr(unsigned long addr)
*/
int dbg_activate_sw_breakpoints(void)
{
unsigned long addr;
int error;
int ret = 0;
int i;
@ -243,16 +244,15 @@ int dbg_activate_sw_breakpoints(void)
if (kgdb_break[i].state != BP_SET)
continue;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_set_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_set_breakpoint(&kgdb_break[i]);
if (error) {
ret = error;
printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
printk(KERN_INFO "KGDB: BP install failed: %lx",
kgdb_break[i].bpt_addr);
continue;
}
kgdb_flush_swbreak_addr(addr);
kgdb_flush_swbreak_addr(kgdb_break[i].bpt_addr);
kgdb_break[i].state = BP_ACTIVE;
}
return ret;
@ -301,7 +301,6 @@ int dbg_set_sw_break(unsigned long addr)
int dbg_deactivate_sw_breakpoints(void)
{
unsigned long addr;
int error;
int ret = 0;
int i;
@ -309,15 +308,14 @@ int dbg_deactivate_sw_breakpoints(void)
for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
if (kgdb_break[i].state != BP_ACTIVE)
continue;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_remove_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_remove_breakpoint(&kgdb_break[i]);
if (error) {
printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
printk(KERN_INFO "KGDB: BP remove failed: %lx\n",
kgdb_break[i].bpt_addr);
ret = error;
}
kgdb_flush_swbreak_addr(addr);
kgdb_flush_swbreak_addr(kgdb_break[i].bpt_addr);
kgdb_break[i].state = BP_SET;
}
return ret;
@ -351,7 +349,6 @@ int kgdb_isremovedbreak(unsigned long addr)
int dbg_remove_all_break(void)
{
unsigned long addr;
int error;
int i;
@ -359,12 +356,10 @@ int dbg_remove_all_break(void)
for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
if (kgdb_break[i].state != BP_ACTIVE)
goto setundefined;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_remove_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_remove_breakpoint(&kgdb_break[i]);
if (error)
printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
addr);
kgdb_break[i].bpt_addr);
setundefined:
kgdb_break[i].state = BP_UNDEFINED;
}

2
kernel/debug/kdb/kdb_io.c
View File

@ -743,7 +743,7 @@ kdb_printit:
kdb_input_flush();
c = console_drivers;
if (!dbg_io_ops->is_console) {
if (dbg_io_ops && !dbg_io_ops->is_console) {
len = strlen(moreprompt);
cp = moreprompt;
while (len--) {