#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
+#include <linux/tracehook.h>
#include <linux/user.h>
#include <linux/elf.h>
#include <linux/security.h>
REGSET_GENERAL,
REGSET_FP,
REGSET_XFP,
+ REGSET_IOPERM64 = REGSET_XFP,
REGSET_TLS,
+ REGSET_IOPERM32,
};
/*
static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
{
BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
- regno >>= 2;
- if (regno > FS)
- --regno;
- return ®s->bx + regno;
+ return ®s->bx + (regno >> 2);
}
static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
if (offset != offsetof(struct user_regs_struct, gs))
retval = *pt_regs_access(task_pt_regs(task), offset);
else {
- retval = task->thread.gs;
if (task == current)
- savesegment(gs, retval);
+ retval = get_user_gs(task_pt_regs(task));
+ else
+ retval = task_user_gs(task);
}
return retval;
}
break;
case offsetof(struct user_regs_struct, gs):
- task->thread.gs = value;
if (task == current)
- /*
- * The user-mode %gs is not affected by
- * kernel entry, so we must update the CPU.
- */
- loadsegment(gs, value);
+ set_user_gs(task_pt_regs(task), value);
+ else
+ task_user_gs(task) = value;
}
return 0;
return 0;
}
-#ifdef CONFIG_X86_PTRACE_BTS
-/*
- * The configuration for a particular BTS hardware implementation.
- */
-struct bts_configuration {
- /* the size of a BTS record in bytes; at most BTS_MAX_RECORD_SIZE */
- unsigned char sizeof_bts;
- /* the size of a field in the BTS record in bytes */
- unsigned char sizeof_field;
- /* a bitmask to enable/disable BTS in DEBUGCTL MSR */
- unsigned long debugctl_mask;
-};
-static struct bts_configuration bts_cfg;
-
-#define BTS_MAX_RECORD_SIZE (8 * 3)
-
-
/*
- * Branch Trace Store (BTS) uses the following format. Different
- * architectures vary in the size of those fields.
- * - source linear address
- * - destination linear address
- * - flags
- *
- * Later architectures use 64bit pointers throughout, whereas earlier
- * architectures use 32bit pointers in 32bit mode.
- *
- * We compute the base address for the first 8 fields based on:
- * - the field size stored in the DS configuration
- * - the relative field position
- *
- * In order to store additional information in the BTS buffer, we use
- * a special source address to indicate that the record requires
- * special interpretation.
- *
- * Netburst indicated via a bit in the flags field whether the branch
- * was predicted; this is ignored.
+ * These access the current or another (stopped) task's io permission
+ * bitmap for debugging or core dump.
*/
-
-enum bts_field {
- bts_from = 0,
- bts_to,
- bts_flags,
-
- bts_escape = (unsigned long)-1,
- bts_qual = bts_to,
- bts_jiffies = bts_flags
-};
-
-static inline unsigned long bts_get(const char *base, enum bts_field field)
+static int ioperm_active(struct task_struct *target,
+ const struct user_regset *regset)
{
- base += (bts_cfg.sizeof_field * field);
- return *(unsigned long *)base;
+ return target->thread.io_bitmap_max / regset->size;
}
-static inline void bts_set(char *base, enum bts_field field, unsigned long val)
+static int ioperm_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- base += (bts_cfg.sizeof_field * field);;
- (*(unsigned long *)base) = val;
-}
+ if (!target->thread.io_bitmap_ptr)
+ return -ENXIO;
-/*
- * Translate a BTS record from the raw format into the bts_struct format
- *
- * out (out): bts_struct interpretation
- * raw: raw BTS record
- */
-static void ptrace_bts_translate_record(struct bts_struct *out, const void *raw)
-{
- memset(out, 0, sizeof(*out));
- if (bts_get(raw, bts_from) == bts_escape) {
- out->qualifier = bts_get(raw, bts_qual);
- out->variant.jiffies = bts_get(raw, bts_jiffies);
- } else {
- out->qualifier = BTS_BRANCH;
- out->variant.lbr.from_ip = bts_get(raw, bts_from);
- out->variant.lbr.to_ip = bts_get(raw, bts_to);
- }
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ target->thread.io_bitmap_ptr,
+ 0, IO_BITMAP_BYTES);
}
+#ifdef CONFIG_X86_PTRACE_BTS
static int ptrace_bts_read_record(struct task_struct *child, size_t index,
struct bts_struct __user *out)
{
- struct bts_struct ret;
- const void *bts_record;
- size_t bts_index, bts_end;
+ const struct bts_trace *trace;
+ struct bts_struct bts;
+ const unsigned char *at;
int error;
- error = ds_get_bts_end(child, &bts_end);
- if (error < 0)
- return error;
-
- if (bts_end <= index)
- return -EINVAL;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- error = ds_get_bts_index(child, &bts_index);
- if (error < 0)
- return error;
+ at = trace->ds.top - ((index + 1) * trace->ds.size);
+ if ((void *)at < trace->ds.begin)
+ at += (trace->ds.n * trace->ds.size);
- /* translate the ptrace bts index into the ds bts index */
- bts_index += bts_end - (index + 1);
- if (bts_end <= bts_index)
- bts_index -= bts_end;
+ if (!trace->read)
+ return -EOPNOTSUPP;
- error = ds_access_bts(child, bts_index, &bts_record);
+ error = trace->read(child->bts, at, &bts);
if (error < 0)
return error;
- ptrace_bts_translate_record(&ret, bts_record);
-
- if (copy_to_user(out, &ret, sizeof(ret)))
+ if (copy_to_user(out, &bts, sizeof(bts)))
return -EFAULT;
- return sizeof(ret);
+ return sizeof(bts);
}
static int ptrace_bts_drain(struct task_struct *child,
long size,
struct bts_struct __user *out)
{
- struct bts_struct ret;
- const unsigned char *raw;
- size_t end, i;
- int error;
+ const struct bts_trace *trace;
+ const unsigned char *at;
+ int error, drained = 0;
- error = ds_get_bts_index(child, &end);
- if (error < 0)
- return error;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- if (size < (end * sizeof(struct bts_struct)))
+ if (!trace->read)
+ return -EOPNOTSUPP;
+
+ if (size < (trace->ds.top - trace->ds.begin))
return -EIO;
- error = ds_access_bts(child, 0, (const void **)&raw);
- if (error < 0)
- return error;
+ for (at = trace->ds.begin; (void *)at < trace->ds.top;
+ out++, drained++, at += trace->ds.size) {
+ struct bts_struct bts;
+ int error;
- for (i = 0; i < end; i++, out++, raw += bts_cfg.sizeof_bts) {
- ptrace_bts_translate_record(&ret, raw);
+ error = trace->read(child->bts, at, &bts);
+ if (error < 0)
+ return error;
- if (copy_to_user(out, &ret, sizeof(ret)))
+ if (copy_to_user(out, &bts, sizeof(bts)))
return -EFAULT;
}
- error = ds_clear_bts(child);
+ memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
+
+ error = ds_reset_bts(child->bts);
if (error < 0)
return error;
- return end;
+ return drained;
+}
+
+static int ptrace_bts_allocate_buffer(struct task_struct *child, size_t size)
+{
+ child->bts_buffer = alloc_locked_buffer(size);
+ if (!child->bts_buffer)
+ return -ENOMEM;
+
+ child->bts_size = size;
+
+ return 0;
}
-static void ptrace_bts_ovfl(struct task_struct *child)
+static void ptrace_bts_free_buffer(struct task_struct *child)
{
- send_sig(child->thread.bts_ovfl_signal, child, 0);
+ free_locked_buffer(child->bts_buffer, child->bts_size);
+ child->bts_buffer = NULL;
+ child->bts_size = 0;
}
static int ptrace_bts_config(struct task_struct *child,
const struct ptrace_bts_config __user *ucfg)
{
struct ptrace_bts_config cfg;
- int error = 0;
-
- error = -EOPNOTSUPP;
- if (!bts_cfg.sizeof_bts)
- goto errout;
+ unsigned int flags = 0;
- error = -EIO;
if (cfg_size < sizeof(cfg))
- goto errout;
+ return -EIO;
- error = -EFAULT;
if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
- goto errout;
+ return -EFAULT;
- error = -EINVAL;
- if ((cfg.flags & PTRACE_BTS_O_SIGNAL) &&
- !(cfg.flags & PTRACE_BTS_O_ALLOC))
- goto errout;
+ if (child->bts) {
+ ds_release_bts(child->bts);
+ child->bts = NULL;
+ }
- if (cfg.flags & PTRACE_BTS_O_ALLOC) {
- ds_ovfl_callback_t ovfl = 0;
- unsigned int sig = 0;
+ if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
+ if (!cfg.signal)
+ return -EINVAL;
- /* we ignore the error in case we were not tracing child */
- (void)ds_release_bts(child);
+ return -EOPNOTSUPP;
- if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
- if (!cfg.signal)
- goto errout;
+ child->thread.bts_ovfl_signal = cfg.signal;
+ }
- sig = cfg.signal;
- ovfl = ptrace_bts_ovfl;
- }
+ if ((cfg.flags & PTRACE_BTS_O_ALLOC) &&
+ (cfg.size != child->bts_size)) {
+ int error;
- error = ds_request_bts(child, /* base = */ 0, cfg.size, ovfl);
- if (error < 0)
- goto errout;
+ ptrace_bts_free_buffer(child);
- child->thread.bts_ovfl_signal = sig;
+ error = ptrace_bts_allocate_buffer(child, cfg.size);
+ if (error < 0)
+ return error;
}
- error = -EINVAL;
- if (!child->thread.ds_ctx && cfg.flags)
- goto errout;
-
if (cfg.flags & PTRACE_BTS_O_TRACE)
- child->thread.debugctlmsr |= bts_cfg.debugctl_mask;
- else
- child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
+ flags |= BTS_USER;
if (cfg.flags & PTRACE_BTS_O_SCHED)
- set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
- else
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
+ flags |= BTS_TIMESTAMPS;
- error = sizeof(cfg);
+ child->bts = ds_request_bts(child, child->bts_buffer, child->bts_size,
+ /* ovfl = */ NULL, /* th = */ (size_t)-1,
+ flags);
+ if (IS_ERR(child->bts)) {
+ int error = PTR_ERR(child->bts);
-out:
- if (child->thread.debugctlmsr)
- set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
- else
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
+ ptrace_bts_free_buffer(child);
+ child->bts = NULL;
- return error;
+ return error;
+ }
-errout:
- child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
- goto out;
+ return sizeof(cfg);
}
static int ptrace_bts_status(struct task_struct *child,
long cfg_size,
struct ptrace_bts_config __user *ucfg)
{
+ const struct bts_trace *trace;
struct ptrace_bts_config cfg;
- size_t end;
- const void *base, *max;
- int error;
if (cfg_size < sizeof(cfg))
return -EIO;
- error = ds_get_bts_end(child, &end);
- if (error < 0)
- return error;
-
- error = ds_access_bts(child, /* index = */ 0, &base);
- if (error < 0)
- return error;
-
- error = ds_access_bts(child, /* index = */ end, &max);
- if (error < 0)
- return error;
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
memset(&cfg, 0, sizeof(cfg));
- cfg.size = (max - base);
+ cfg.size = trace->ds.end - trace->ds.begin;
cfg.signal = child->thread.bts_ovfl_signal;
cfg.bts_size = sizeof(struct bts_struct);
if (cfg.signal)
cfg.flags |= PTRACE_BTS_O_SIGNAL;
- if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
- child->thread.debugctlmsr & bts_cfg.debugctl_mask)
+ if (trace->ds.flags & BTS_USER)
cfg.flags |= PTRACE_BTS_O_TRACE;
- if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
+ if (trace->ds.flags & BTS_TIMESTAMPS)
cfg.flags |= PTRACE_BTS_O_SCHED;
if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
return sizeof(cfg);
}
-static int ptrace_bts_write_record(struct task_struct *child,
- const struct bts_struct *in)
+static int ptrace_bts_clear(struct task_struct *child)
{
- unsigned char bts_record[BTS_MAX_RECORD_SIZE];
+ const struct bts_trace *trace;
- BUG_ON(BTS_MAX_RECORD_SIZE < bts_cfg.sizeof_bts);
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- memset(bts_record, 0, bts_cfg.sizeof_bts);
- switch (in->qualifier) {
- case BTS_INVALID:
- break;
+ memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
- case BTS_BRANCH:
- bts_set(bts_record, bts_from, in->variant.lbr.from_ip);
- bts_set(bts_record, bts_to, in->variant.lbr.to_ip);
- break;
+ return ds_reset_bts(child->bts);
+}
- case BTS_TASK_ARRIVES:
- case BTS_TASK_DEPARTS:
- bts_set(bts_record, bts_from, bts_escape);
- bts_set(bts_record, bts_qual, in->qualifier);
- bts_set(bts_record, bts_jiffies, in->variant.jiffies);
- break;
+static int ptrace_bts_size(struct task_struct *child)
+{
+ const struct bts_trace *trace;
- default:
- return -EINVAL;
- }
+ trace = ds_read_bts(child->bts);
+ if (!trace)
+ return -EPERM;
- /* The writing task will be the switched-to task on a context
- * switch. It needs to write into the switched-from task's BTS
- * buffer. */
- return ds_unchecked_write_bts(child, bts_record, bts_cfg.sizeof_bts);
+ return (trace->ds.top - trace->ds.begin) / trace->ds.size;
}
-void ptrace_bts_take_timestamp(struct task_struct *tsk,
- enum bts_qualifier qualifier)
+static void ptrace_bts_fork(struct task_struct *tsk)
{
- struct bts_struct rec = {
- .qualifier = qualifier,
- .variant.jiffies = jiffies_64
- };
-
- ptrace_bts_write_record(tsk, &rec);
+ tsk->bts = NULL;
+ tsk->bts_buffer = NULL;
+ tsk->bts_size = 0;
+ tsk->thread.bts_ovfl_signal = 0;
}
-static const struct bts_configuration bts_cfg_netburst = {
- .sizeof_bts = sizeof(long) * 3,
- .sizeof_field = sizeof(long),
- .debugctl_mask = (1<<2)|(1<<3)|(1<<5)
-};
-
-static const struct bts_configuration bts_cfg_pentium_m = {
- .sizeof_bts = sizeof(long) * 3,
- .sizeof_field = sizeof(long),
- .debugctl_mask = (1<<6)|(1<<7)
-};
+static void ptrace_bts_untrace(struct task_struct *child)
+{
+ if (unlikely(child->bts)) {
+ ds_release_bts(child->bts);
+ child->bts = NULL;
+
+ /* We cannot update total_vm and locked_vm since
+ child's mm is already gone. But we can reclaim the
+ memory. */
+ kfree(child->bts_buffer);
+ child->bts_buffer = NULL;
+ child->bts_size = 0;
+ }
+}
-static const struct bts_configuration bts_cfg_core2 = {
- .sizeof_bts = 8 * 3,
- .sizeof_field = 8,
- .debugctl_mask = (1<<6)|(1<<7)|(1<<9)
-};
+static void ptrace_bts_detach(struct task_struct *child)
+{
+ /*
+ * Ptrace_detach() races with ptrace_untrace() in case
+ * the child dies and is reaped by another thread.
+ *
+ * We only do the memory accounting at this point and
+ * leave the buffer deallocation and the bts tracer
+ * release to ptrace_bts_untrace() which will be called
+ * later on with tasklist_lock held.
+ */
+ release_locked_buffer(child->bts_buffer, child->bts_size);
+}
+#else
+static inline void ptrace_bts_fork(struct task_struct *tsk) {}
+static inline void ptrace_bts_detach(struct task_struct *child) {}
+static inline void ptrace_bts_untrace(struct task_struct *child) {}
+#endif /* CONFIG_X86_PTRACE_BTS */
-static inline void bts_configure(const struct bts_configuration *cfg)
+void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
{
- bts_cfg = *cfg;
+ ptrace_bts_fork(child);
}
-void __cpuinit ptrace_bts_init_intel(struct cpuinfo_x86 *c)
+void x86_ptrace_untrace(struct task_struct *child)
{
- switch (c->x86) {
- case 0x6:
- switch (c->x86_model) {
- case 0xD:
- case 0xE: /* Pentium M */
- bts_configure(&bts_cfg_pentium_m);
- break;
- case 0xF: /* Core2 */
- case 0x1C: /* Atom */
- bts_configure(&bts_cfg_core2);
- break;
- default:
- /* sorry, don't know about them */
- break;
- }
- break;
- case 0xF:
- switch (c->x86_model) {
- case 0x0:
- case 0x1:
- case 0x2: /* Netburst */
- bts_configure(&bts_cfg_netburst);
- break;
- default:
- /* sorry, don't know about them */
- break;
- }
- break;
- default:
- /* sorry, don't know about them */
- break;
- }
+ ptrace_bts_untrace(child);
}
-#endif /* CONFIG_X86_PTRACE_BTS */
/*
* Called by kernel/ptrace.c when detaching..
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
-#ifdef CONFIG_X86_PTRACE_BTS
- (void)ds_release_bts(child);
-
- child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
- if (!child->thread.debugctlmsr)
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
-
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
-#endif /* CONFIG_X86_PTRACE_BTS */
+ ptrace_bts_detach(child);
}
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
break;
case PTRACE_BTS_SIZE:
- ret = ds_get_bts_index(child, /* pos = */ 0);
+ ret = ptrace_bts_size(child);
break;
case PTRACE_BTS_GET:
break;
case PTRACE_BTS_CLEAR:
- ret = ds_clear_bts(child);
+ ret = ptrace_bts_clear(child);
break;
case PTRACE_BTS_DRAIN:
case PTRACE_GET_THREAD_AREA:
case PTRACE_SET_THREAD_AREA:
+#ifdef CONFIG_X86_PTRACE_BTS
+ case PTRACE_BTS_CONFIG:
+ case PTRACE_BTS_STATUS:
+ case PTRACE_BTS_SIZE:
+ case PTRACE_BTS_GET:
+ case PTRACE_BTS_CLEAR:
+ case PTRACE_BTS_DRAIN:
+#endif /* CONFIG_X86_PTRACE_BTS */
return arch_ptrace(child, request, addr, data);
default:
.size = sizeof(long), .align = sizeof(long),
.active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
},
+ [REGSET_IOPERM64] = {
+ .core_note_type = NT_386_IOPERM,
+ .n = IO_BITMAP_LONGS,
+ .size = sizeof(long), .align = sizeof(long),
+ .active = ioperm_active, .get = ioperm_get
+ },
};
static const struct user_regset_view user_x86_64_view = {
.active = regset_tls_active,
.get = regset_tls_get, .set = regset_tls_set
},
+ [REGSET_IOPERM32] = {
+ .core_note_type = NT_386_IOPERM,
+ .n = IO_BITMAP_BYTES / sizeof(u32),
+ .size = sizeof(u32), .align = sizeof(u32),
+ .active = ioperm_active, .get = ioperm_get
+ },
};
static const struct user_regset_view user_x86_32_view = {
#endif
}
-void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
+void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+ int error_code, int si_code)
{
struct siginfo info;
memset(&info, 0, sizeof(info));
info.si_signo = SIGTRAP;
- info.si_code = TRAP_BRKPT;
+ info.si_code = si_code;
/* User-mode ip? */
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
force_sig_info(SIGTRAP, &info, tsk);
}
-static void syscall_trace(struct pt_regs *regs)
-{
- if (!(current->ptrace & PT_PTRACED))
- return;
-
-#if 0
- printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
- current->comm,
- regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
- current_thread_info()->flags, current->ptrace);
-#endif
-
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
#ifdef CONFIG_X86_32
# define IS_IA32 1
if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
ret = -1L;
- if (ret || test_thread_flag(TIF_SYSCALL_TRACE))
- syscall_trace(regs);
+ if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
+ tracehook_report_syscall_entry(regs))
+ ret = -1L;
if (unlikely(current->audit_context)) {
if (IS_IA32)
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
if (test_thread_flag(TIF_SYSCALL_TRACE))
- syscall_trace(regs);
+ tracehook_report_syscall_exit(regs, 0);
/*
* If TIF_SYSCALL_EMU is set, we only get here because of
* system call instruction.
*/
if (test_thread_flag(TIF_SINGLESTEP) &&
- (current->ptrace & PT_PTRACED))
- send_sigtrap(current, regs, 0);
+ tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
+ send_sigtrap(current, regs, 0, TRAP_BRKPT);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff