| /* By Ross Biro 1/23/92 */ |
| /* |
| * Pentium III FXSR, SSE support |
| * Gareth Hughes <gareth@valinux.com>, May 2000 |
| * |
| * BTS tracing |
| * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/smp.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/regset.h> |
| #include <linux/user.h> |
| #include <linux/elf.h> |
| #include <linux/security.h> |
| #include <linux/audit.h> |
| #include <linux/seccomp.h> |
| #include <linux/signal.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/pgtable.h> |
| #include <asm/system.h> |
| #include <asm/processor.h> |
| #include <asm/i387.h> |
| #include <asm/debugreg.h> |
| #include <asm/ldt.h> |
| #include <asm/desc.h> |
| #include <asm/prctl.h> |
| #include <asm/proto.h> |
| #include <asm/ds.h> |
| |
| #include "tls.h" |
| |
| enum x86_regset { |
| REGSET_GENERAL, |
| REGSET_FP, |
| REGSET_XFP, |
| REGSET_TLS, |
| }; |
| |
| /* |
| * does not yet catch signals sent when the child dies. |
| * in exit.c or in signal.c. |
| */ |
| |
| /* |
| * Determines which flags the user has access to [1 = access, 0 = no access]. |
| */ |
| #define FLAG_MASK_32 ((unsigned long) \ |
| (X86_EFLAGS_CF | X86_EFLAGS_PF | \ |
| X86_EFLAGS_AF | X86_EFLAGS_ZF | \ |
| X86_EFLAGS_SF | X86_EFLAGS_TF | \ |
| X86_EFLAGS_DF | X86_EFLAGS_OF | \ |
| X86_EFLAGS_RF | X86_EFLAGS_AC)) |
| |
| /* |
| * Determines whether a value may be installed in a segment register. |
| */ |
| static inline bool invalid_selector(u16 value) |
| { |
| return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); |
| } |
| |
| #ifdef CONFIG_X86_32 |
| |
| #define FLAG_MASK FLAG_MASK_32 |
| |
| static 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; |
| } |
| |
| static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
| { |
| /* |
| * Returning the value truncates it to 16 bits. |
| */ |
| unsigned int retval; |
| 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); |
| } |
| return retval; |
| } |
| |
| static int set_segment_reg(struct task_struct *task, |
| unsigned long offset, u16 value) |
| { |
| /* |
| * The value argument was already truncated to 16 bits. |
| */ |
| if (invalid_selector(value)) |
| return -EIO; |
| |
| /* |
| * For %cs and %ss we cannot permit a null selector. |
| * We can permit a bogus selector as long as it has USER_RPL. |
| * Null selectors are fine for other segment registers, but |
| * we will never get back to user mode with invalid %cs or %ss |
| * and will take the trap in iret instead. Much code relies |
| * on user_mode() to distinguish a user trap frame (which can |
| * safely use invalid selectors) from a kernel trap frame. |
| */ |
| switch (offset) { |
| case offsetof(struct user_regs_struct, cs): |
| case offsetof(struct user_regs_struct, ss): |
| if (unlikely(value == 0)) |
| return -EIO; |
| |
| default: |
| *pt_regs_access(task_pt_regs(task), offset) = value; |
| 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); |
| } |
| |
| return 0; |
| } |
| |
| static unsigned long debugreg_addr_limit(struct task_struct *task) |
| { |
| return TASK_SIZE - 3; |
| } |
| |
| #else /* CONFIG_X86_64 */ |
| |
| #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) |
| |
| static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) |
| { |
| BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); |
| return ®s->r15 + (offset / sizeof(regs->r15)); |
| } |
| |
| static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
| { |
| /* |
| * Returning the value truncates it to 16 bits. |
| */ |
| unsigned int seg; |
| |
| switch (offset) { |
| case offsetof(struct user_regs_struct, fs): |
| if (task == current) { |
| /* Older gas can't assemble movq %?s,%r?? */ |
| asm("movl %%fs,%0" : "=r" (seg)); |
| return seg; |
| } |
| return task->thread.fsindex; |
| case offsetof(struct user_regs_struct, gs): |
| if (task == current) { |
| asm("movl %%gs,%0" : "=r" (seg)); |
| return seg; |
| } |
| return task->thread.gsindex; |
| case offsetof(struct user_regs_struct, ds): |
| if (task == current) { |
| asm("movl %%ds,%0" : "=r" (seg)); |
| return seg; |
| } |
| return task->thread.ds; |
| case offsetof(struct user_regs_struct, es): |
| if (task == current) { |
| asm("movl %%es,%0" : "=r" (seg)); |
| return seg; |
| } |
| return task->thread.es; |
| |
| case offsetof(struct user_regs_struct, cs): |
| case offsetof(struct user_regs_struct, ss): |
| break; |
| } |
| return *pt_regs_access(task_pt_regs(task), offset); |
| } |
| |
| static int set_segment_reg(struct task_struct *task, |
| unsigned long offset, u16 value) |
| { |
| /* |
| * The value argument was already truncated to 16 bits. |
| */ |
| if (invalid_selector(value)) |
| return -EIO; |
| |
| switch (offset) { |
| case offsetof(struct user_regs_struct,fs): |
| /* |
| * If this is setting fs as for normal 64-bit use but |
| * setting fs_base has implicitly changed it, leave it. |
| */ |
| if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && |
| task->thread.fs != 0) || |
| (value == 0 && task->thread.fsindex == FS_TLS_SEL && |
| task->thread.fs == 0)) |
| break; |
| task->thread.fsindex = value; |
| if (task == current) |
| loadsegment(fs, task->thread.fsindex); |
| break; |
| case offsetof(struct user_regs_struct,gs): |
| /* |
| * If this is setting gs as for normal 64-bit use but |
| * setting gs_base has implicitly changed it, leave it. |
| */ |
| if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && |
| task->thread.gs != 0) || |
| (value == 0 && task->thread.gsindex == GS_TLS_SEL && |
| task->thread.gs == 0)) |
| break; |
| task->thread.gsindex = value; |
| if (task == current) |
| load_gs_index(task->thread.gsindex); |
| break; |
| case offsetof(struct user_regs_struct,ds): |
| task->thread.ds = value; |
| if (task == current) |
| loadsegment(ds, task->thread.ds); |
| break; |
| case offsetof(struct user_regs_struct,es): |
| task->thread.es = value; |
| if (task == current) |
| loadsegment(es, task->thread.es); |
| break; |
| |
| /* |
| * Can't actually change these in 64-bit mode. |
| */ |
| case offsetof(struct user_regs_struct,cs): |
| if (unlikely(value == 0)) |
| return -EIO; |
| #ifdef CONFIG_IA32_EMULATION |
| if (test_tsk_thread_flag(task, TIF_IA32)) |
| task_pt_regs(task)->cs = value; |
| #endif |
| break; |
| case offsetof(struct user_regs_struct,ss): |
| if (unlikely(value == 0)) |
| return -EIO; |
| #ifdef CONFIG_IA32_EMULATION |
| if (test_tsk_thread_flag(task, TIF_IA32)) |
| task_pt_regs(task)->ss = value; |
| #endif |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static unsigned long debugreg_addr_limit(struct task_struct *task) |
| { |
| #ifdef CONFIG_IA32_EMULATION |
| if (test_tsk_thread_flag(task, TIF_IA32)) |
| return IA32_PAGE_OFFSET - 3; |
| #endif |
| return TASK_SIZE64 - 7; |
| } |
| |
| #endif /* CONFIG_X86_32 */ |
| |
| static unsigned long get_flags(struct task_struct *task) |
| { |
| unsigned long retval = task_pt_regs(task)->flags; |
| |
| /* |
| * If the debugger set TF, hide it from the readout. |
| */ |
| if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| retval &= ~X86_EFLAGS_TF; |
| |
| return retval; |
| } |
| |
| static int set_flags(struct task_struct *task, unsigned long value) |
| { |
| struct pt_regs *regs = task_pt_regs(task); |
| |
| /* |
| * If the user value contains TF, mark that |
| * it was not "us" (the debugger) that set it. |
| * If not, make sure it stays set if we had. |
| */ |
| if (value & X86_EFLAGS_TF) |
| clear_tsk_thread_flag(task, TIF_FORCED_TF); |
| else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| value |= X86_EFLAGS_TF; |
| |
| regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); |
| |
| return 0; |
| } |
| |
| static int putreg(struct task_struct *child, |
| unsigned long offset, unsigned long value) |
| { |
| switch (offset) { |
| case offsetof(struct user_regs_struct, cs): |
| case offsetof(struct user_regs_struct, ds): |
| case offsetof(struct user_regs_struct, es): |
| case offsetof(struct user_regs_struct, fs): |
| case offsetof(struct user_regs_struct, gs): |
| case offsetof(struct user_regs_struct, ss): |
| return set_segment_reg(child, offset, value); |
| |
| case offsetof(struct user_regs_struct, flags): |
| return set_flags(child, value); |
| |
| #ifdef CONFIG_X86_64 |
| case offsetof(struct user_regs_struct,fs_base): |
| if (value >= TASK_SIZE_OF(child)) |
| return -EIO; |
| /* |
| * When changing the segment base, use do_arch_prctl |
| * to set either thread.fs or thread.fsindex and the |
| * corresponding GDT slot. |
| */ |
| if (child->thread.fs != value) |
| return do_arch_prctl(child, ARCH_SET_FS, value); |
| return 0; |
| case offsetof(struct user_regs_struct,gs_base): |
| /* |
| * Exactly the same here as the %fs handling above. |
| */ |
| if (value >= TASK_SIZE_OF(child)) |
| return -EIO; |
| if (child->thread.gs != value) |
| return do_arch_prctl(child, ARCH_SET_GS, value); |
| return 0; |
| #endif |
| } |
| |
| *pt_regs_access(task_pt_regs(child), offset) = value; |
| return 0; |
| } |
| |
| static unsigned long getreg(struct task_struct *task, unsigned long offset) |
| { |
| switch (offset) { |
| case offsetof(struct user_regs_struct, cs): |
| case offsetof(struct user_regs_struct, ds): |
| case offsetof(struct user_regs_struct, es): |
| case offsetof(struct user_regs_struct, fs): |
| case offsetof(struct user_regs_struct, gs): |
| case offsetof(struct user_regs_struct, ss): |
| return get_segment_reg(task, offset); |
| |
| case offsetof(struct user_regs_struct, flags): |
| return get_flags(task); |
| |
| #ifdef CONFIG_X86_64 |
| case offsetof(struct user_regs_struct, fs_base): { |
| /* |
| * do_arch_prctl may have used a GDT slot instead of |
| * the MSR. To userland, it appears the same either |
| * way, except the %fs segment selector might not be 0. |
| */ |
| unsigned int seg = task->thread.fsindex; |
| if (task->thread.fs != 0) |
| return task->thread.fs; |
| if (task == current) |
| asm("movl %%fs,%0" : "=r" (seg)); |
| if (seg != FS_TLS_SEL) |
| return 0; |
| return get_desc_base(&task->thread.tls_array[FS_TLS]); |
| } |
| case offsetof(struct user_regs_struct, gs_base): { |
| /* |
| * Exactly the same here as the %fs handling above. |
| */ |
| unsigned int seg = task->thread.gsindex; |
| if (task->thread.gs != 0) |
| return task->thread.gs; |
| if (task == current) |
| asm("movl %%gs,%0" : "=r" (seg)); |
| if (seg != GS_TLS_SEL) |
| return 0; |
| return get_desc_base(&task->thread.tls_array[GS_TLS]); |
| } |
| #endif |
| } |
| |
| return *pt_regs_access(task_pt_regs(task), offset); |
| } |
| |
| static int genregs_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| if (kbuf) { |
| unsigned long *k = kbuf; |
| while (count > 0) { |
| *k++ = getreg(target, pos); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| unsigned long __user *u = ubuf; |
| while (count > 0) { |
| if (__put_user(getreg(target, pos), u++)) |
| return -EFAULT; |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int genregs_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| int ret = 0; |
| if (kbuf) { |
| const unsigned long *k = kbuf; |
| while (count > 0 && !ret) { |
| ret = putreg(target, pos, *k++); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| const unsigned long __user *u = ubuf; |
| while (count > 0 && !ret) { |
| unsigned long word; |
| ret = __get_user(word, u++); |
| if (ret) |
| break; |
| ret = putreg(target, pos, word); |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| return ret; |
| } |
| |
| /* |
| * This function is trivial and will be inlined by the compiler. |
| * Having it separates the implementation details of debug |
| * registers from the interface details of ptrace. |
| */ |
| static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) |
| { |
| switch (n) { |
| case 0: return child->thread.debugreg0; |
| case 1: return child->thread.debugreg1; |
| case 2: return child->thread.debugreg2; |
| case 3: return child->thread.debugreg3; |
| case 6: return child->thread.debugreg6; |
| case 7: return child->thread.debugreg7; |
| } |
| return 0; |
| } |
| |
| static int ptrace_set_debugreg(struct task_struct *child, |
| int n, unsigned long data) |
| { |
| int i; |
| |
| if (unlikely(n == 4 || n == 5)) |
| return -EIO; |
| |
| if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
| return -EIO; |
| |
| switch (n) { |
| case 0: child->thread.debugreg0 = data; break; |
| case 1: child->thread.debugreg1 = data; break; |
| case 2: child->thread.debugreg2 = data; break; |
| case 3: child->thread.debugreg3 = data; break; |
| |
| case 6: |
| if ((data & ~0xffffffffUL) != 0) |
| return -EIO; |
| child->thread.debugreg6 = data; |
| break; |
| |
| case 7: |
| /* |
| * Sanity-check data. Take one half-byte at once with |
| * check = (val >> (16 + 4*i)) & 0xf. It contains the |
| * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits |
| * 2 and 3 are LENi. Given a list of invalid values, |
| * we do mask |= 1 << invalid_value, so that |
| * (mask >> check) & 1 is a correct test for invalid |
| * values. |
| * |
| * R/Wi contains the type of the breakpoint / |
| * watchpoint, LENi contains the length of the watched |
| * data in the watchpoint case. |
| * |
| * The invalid values are: |
| * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
| * - R/Wi == 0x10 (break on I/O reads or writes), so |
| * mask |= 0x4444. |
| * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= |
| * 0x1110. |
| * |
| * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. |
| * |
| * See the Intel Manual "System Programming Guide", |
| * 15.2.4 |
| * |
| * Note that LENi == 0x10 is defined on x86_64 in long |
| * mode (i.e. even for 32-bit userspace software, but |
| * 64-bit kernel), so the x86_64 mask value is 0x5454. |
| * See the AMD manual no. 24593 (AMD64 System Programming) |
| */ |
| #ifdef CONFIG_X86_32 |
| #define DR7_MASK 0x5f54 |
| #else |
| #define DR7_MASK 0x5554 |
| #endif |
| data &= ~DR_CONTROL_RESERVED; |
| for (i = 0; i < 4; i++) |
| if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
| return -EIO; |
| child->thread.debugreg7 = data; |
| if (data) |
| set_tsk_thread_flag(child, TIF_DEBUG); |
| else |
| clear_tsk_thread_flag(child, TIF_DEBUG); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int ptrace_bts_get_size(struct task_struct *child) |
| { |
| if (!child->thread.ds_area_msr) |
| return -ENXIO; |
| |
| return ds_get_bts_index((void *)child->thread.ds_area_msr); |
| } |
| |
| static int ptrace_bts_read_record(struct task_struct *child, |
| long index, |
| struct bts_struct __user *out) |
| { |
| struct bts_struct ret; |
| int retval; |
| int bts_end; |
| int bts_index; |
| |
| if (!child->thread.ds_area_msr) |
| return -ENXIO; |
| |
| if (index < 0) |
| return -EINVAL; |
| |
| bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr); |
| if (bts_end <= index) |
| return -EINVAL; |
| |
| /* translate the ptrace bts index into the ds bts index */ |
| bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr); |
| bts_index -= (index + 1); |
| if (bts_index < 0) |
| bts_index += bts_end; |
| |
| retval = ds_read_bts((void *)child->thread.ds_area_msr, |
| bts_index, &ret); |
| if (retval < 0) |
| return retval; |
| |
| if (copy_to_user(out, &ret, sizeof(ret))) |
| return -EFAULT; |
| |
| return sizeof(ret); |
| } |
| |
| static int ptrace_bts_write_record(struct task_struct *child, |
| const struct bts_struct *in) |
| { |
| int retval; |
| |
| if (!child->thread.ds_area_msr) |
| return -ENXIO; |
| |
| retval = ds_write_bts((void *)child->thread.ds_area_msr, in); |
| if (retval) |
| return retval; |
| |
| return sizeof(*in); |
| } |
| |
| static int ptrace_bts_clear(struct task_struct *child) |
| { |
| if (!child->thread.ds_area_msr) |
| return -ENXIO; |
| |
| return ds_clear((void *)child->thread.ds_area_msr); |
| } |
| |
| static int ptrace_bts_drain(struct task_struct *child, |
| long size, |
| struct bts_struct __user *out) |
| { |
| int end, i; |
| void *ds = (void *)child->thread.ds_area_msr; |
| |
| if (!ds) |
| return -ENXIO; |
| |
| end = ds_get_bts_index(ds); |
| if (end <= 0) |
| return end; |
| |
| if (size < (end * sizeof(struct bts_struct))) |
| return -EIO; |
| |
| for (i = 0; i < end; i++, out++) { |
| struct bts_struct ret; |
| int retval; |
| |
| retval = ds_read_bts(ds, i, &ret); |
| if (retval < 0) |
| return retval; |
| |
| if (copy_to_user(out, &ret, sizeof(ret))) |
| return -EFAULT; |
| } |
| |
| ds_clear(ds); |
| |
| return end; |
| } |
| |
| static int ptrace_bts_realloc(struct task_struct *child, |
| int size, int reduce_size) |
| { |
| unsigned long rlim, vm; |
| int ret, old_size; |
| |
| if (size < 0) |
| return -EINVAL; |
| |
| old_size = ds_get_bts_size((void *)child->thread.ds_area_msr); |
| if (old_size < 0) |
| return old_size; |
| |
| ret = ds_free((void **)&child->thread.ds_area_msr); |
| if (ret < 0) |
| goto out; |
| |
| size >>= PAGE_SHIFT; |
| old_size >>= PAGE_SHIFT; |
| |
| current->mm->total_vm -= old_size; |
| current->mm->locked_vm -= old_size; |
| |
| if (size == 0) |
| goto out; |
| |
| rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT; |
| vm = current->mm->total_vm + size; |
| if (rlim < vm) { |
| ret = -ENOMEM; |
| |
| if (!reduce_size) |
| goto out; |
| |
| size = rlim - current->mm->total_vm; |
| if (size <= 0) |
| goto out; |
| } |
| |
| rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; |
| vm = current->mm->locked_vm + size; |
| if (rlim < vm) { |
| ret = -ENOMEM; |
| |
| if (!reduce_size) |
| goto out; |
| |
| size = rlim - current->mm->locked_vm; |
| if (size <= 0) |
| goto out; |
| } |
| |
| ret = ds_allocate((void **)&child->thread.ds_area_msr, |
| size << PAGE_SHIFT); |
| if (ret < 0) |
| goto out; |
| |
| current->mm->total_vm += size; |
| current->mm->locked_vm += size; |
| |
| out: |
| if (child->thread.ds_area_msr) |
| set_tsk_thread_flag(child, TIF_DS_AREA_MSR); |
| else |
| clear_tsk_thread_flag(child, TIF_DS_AREA_MSR); |
| |
| return ret; |
| } |
| |
| static int ptrace_bts_config(struct task_struct *child, |
| long cfg_size, |
| const struct ptrace_bts_config __user *ucfg) |
| { |
| struct ptrace_bts_config cfg; |
| int bts_size, ret = 0; |
| void *ds; |
| |
| if (cfg_size < sizeof(cfg)) |
| return -EIO; |
| |
| if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
| return -EFAULT; |
| |
| if ((int)cfg.size < 0) |
| return -EINVAL; |
| |
| bts_size = 0; |
| ds = (void *)child->thread.ds_area_msr; |
| if (ds) { |
| bts_size = ds_get_bts_size(ds); |
| if (bts_size < 0) |
| return bts_size; |
| } |
| cfg.size = PAGE_ALIGN(cfg.size); |
| |
| if (bts_size != cfg.size) { |
| ret = ptrace_bts_realloc(child, cfg.size, |
| cfg.flags & PTRACE_BTS_O_CUT_SIZE); |
| if (ret < 0) |
| goto errout; |
| |
| ds = (void *)child->thread.ds_area_msr; |
| } |
| |
| if (cfg.flags & PTRACE_BTS_O_SIGNAL) |
| ret = ds_set_overflow(ds, DS_O_SIGNAL); |
| else |
| ret = ds_set_overflow(ds, DS_O_WRAP); |
| if (ret < 0) |
| goto errout; |
| |
| if (cfg.flags & PTRACE_BTS_O_TRACE) |
| child->thread.debugctlmsr |= ds_debugctl_mask(); |
| else |
| child->thread.debugctlmsr &= ~ds_debugctl_mask(); |
| |
| 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); |
| |
| ret = sizeof(cfg); |
| |
| out: |
| if (child->thread.debugctlmsr) |
| set_tsk_thread_flag(child, TIF_DEBUGCTLMSR); |
| else |
| clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); |
| |
| return ret; |
| |
| errout: |
| child->thread.debugctlmsr &= ~ds_debugctl_mask(); |
| clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); |
| goto out; |
| } |
| |
| static int ptrace_bts_status(struct task_struct *child, |
| long cfg_size, |
| struct ptrace_bts_config __user *ucfg) |
| { |
| void *ds = (void *)child->thread.ds_area_msr; |
| struct ptrace_bts_config cfg; |
| |
| if (cfg_size < sizeof(cfg)) |
| return -EIO; |
| |
| memset(&cfg, 0, sizeof(cfg)); |
| |
| if (ds) { |
| cfg.size = ds_get_bts_size(ds); |
| |
| if (ds_get_overflow(ds) == DS_O_SIGNAL) |
| cfg.flags |= PTRACE_BTS_O_SIGNAL; |
| |
| if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) && |
| child->thread.debugctlmsr & ds_debugctl_mask()) |
| cfg.flags |= PTRACE_BTS_O_TRACE; |
| |
| if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS)) |
| cfg.flags |= PTRACE_BTS_O_SCHED; |
| } |
| |
| cfg.bts_size = sizeof(struct bts_struct); |
| |
| if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
| return -EFAULT; |
| |
| return sizeof(cfg); |
| } |
| |
| void ptrace_bts_take_timestamp(struct task_struct *tsk, |
| enum bts_qualifier qualifier) |
| { |
| struct bts_struct rec = { |
| .qualifier = qualifier, |
| .variant.jiffies = jiffies_64 |
| }; |
| |
| ptrace_bts_write_record(tsk, &rec); |
| } |
| |
| /* |
| * Called by kernel/ptrace.c when detaching.. |
| * |
| * Make sure the single step bit is not set. |
| */ |
| void ptrace_disable(struct task_struct *child) |
| { |
| user_disable_single_step(child); |
| #ifdef TIF_SYSCALL_EMU |
| clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
| #endif |
| if (child->thread.ds_area_msr) { |
| ptrace_bts_realloc(child, 0, 0); |
| child->thread.debugctlmsr &= ~ds_debugctl_mask(); |
| if (!child->thread.debugctlmsr) |
| clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); |
| clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); |
| } |
| } |
| |
| #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| static const struct user_regset_view user_x86_32_view; /* Initialized below. */ |
| #endif |
| |
| long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
| { |
| int ret; |
| unsigned long __user *datap = (unsigned long __user *)data; |
| |
| switch (request) { |
| /* read the word at location addr in the USER area. */ |
| case PTRACE_PEEKUSR: { |
| unsigned long tmp; |
| |
| ret = -EIO; |
| if ((addr & (sizeof(data) - 1)) || addr < 0 || |
| addr >= sizeof(struct user)) |
| break; |
| |
| tmp = 0; /* Default return condition */ |
| if (addr < sizeof(struct user_regs_struct)) |
| tmp = getreg(child, addr); |
| else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| addr <= offsetof(struct user, u_debugreg[7])) { |
| addr -= offsetof(struct user, u_debugreg[0]); |
| tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
| } |
| ret = put_user(tmp, datap); |
| break; |
| } |
| |
| case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
| ret = -EIO; |
| if ((addr & (sizeof(data) - 1)) || addr < 0 || |
| addr >= sizeof(struct user)) |
| break; |
| |
| if (addr < sizeof(struct user_regs_struct)) |
| ret = putreg(child, addr, data); |
| else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| addr <= offsetof(struct user, u_debugreg[7])) { |
| addr -= offsetof(struct user, u_debugreg[0]); |
| ret = ptrace_set_debugreg(child, |
| addr / sizeof(data), data); |
| } |
| break; |
| |
| case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| return copy_regset_to_user(child, |
| task_user_regset_view(current), |
| REGSET_GENERAL, |
| 0, sizeof(struct user_regs_struct), |
| datap); |
| |
| case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| return copy_regset_from_user(child, |
| task_user_regset_view(current), |
| REGSET_GENERAL, |
| 0, sizeof(struct user_regs_struct), |
| datap); |
| |
| case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| return copy_regset_to_user(child, |
| task_user_regset_view(current), |
| REGSET_FP, |
| 0, sizeof(struct user_i387_struct), |
| datap); |
| |
| case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| return copy_regset_from_user(child, |
| task_user_regset_view(current), |
| REGSET_FP, |
| 0, sizeof(struct user_i387_struct), |
| datap); |
| |
| #ifdef CONFIG_X86_32 |
| case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| return copy_regset_to_user(child, &user_x86_32_view, |
| REGSET_XFP, |
| 0, sizeof(struct user_fxsr_struct), |
| datap); |
| |
| case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| return copy_regset_from_user(child, &user_x86_32_view, |
| REGSET_XFP, |
| 0, sizeof(struct user_fxsr_struct), |
| datap); |
| #endif |
| |
| #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| case PTRACE_GET_THREAD_AREA: |
| if (addr < 0) |
| return -EIO; |
| ret = do_get_thread_area(child, addr, |
| (struct user_desc __user *) data); |
| break; |
| |
| case PTRACE_SET_THREAD_AREA: |
| if (addr < 0) |
| return -EIO; |
| ret = do_set_thread_area(child, addr, |
| (struct user_desc __user *) data, 0); |
| break; |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| /* normal 64bit interface to access TLS data. |
| Works just like arch_prctl, except that the arguments |
| are reversed. */ |
| case PTRACE_ARCH_PRCTL: |
| ret = do_arch_prctl(child, data, addr); |
| break; |
| #endif |
| |
| case PTRACE_BTS_CONFIG: |
| ret = ptrace_bts_config |
| (child, data, (struct ptrace_bts_config __user *)addr); |
| break; |
| |
| case PTRACE_BTS_STATUS: |
| ret = ptrace_bts_status |
| (child, data, (struct ptrace_bts_config __user *)addr); |
| break; |
| |
| case PTRACE_BTS_SIZE: |
| ret = ptrace_bts_get_size(child); |
| break; |
| |
| case PTRACE_BTS_GET: |
| ret = ptrace_bts_read_record |
| (child, data, (struct bts_struct __user *) addr); |
| break; |
| |
| case PTRACE_BTS_CLEAR: |
| ret = ptrace_bts_clear(child); |
| break; |
| |
| case PTRACE_BTS_DRAIN: |
| ret = ptrace_bts_drain |
| (child, data, (struct bts_struct __user *) addr); |
| break; |
| |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_IA32_EMULATION |
| |
| #include <linux/compat.h> |
| #include <linux/syscalls.h> |
| #include <asm/ia32.h> |
| #include <asm/user32.h> |
| |
| #define R32(l,q) \ |
| case offsetof(struct user32, regs.l): \ |
| regs->q = value; break |
| |
| #define SEG32(rs) \ |
| case offsetof(struct user32, regs.rs): \ |
| return set_segment_reg(child, \ |
| offsetof(struct user_regs_struct, rs), \ |
| value); \ |
| break |
| |
| static int putreg32(struct task_struct *child, unsigned regno, u32 value) |
| { |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| switch (regno) { |
| |
| SEG32(cs); |
| SEG32(ds); |
| SEG32(es); |
| SEG32(fs); |
| SEG32(gs); |
| SEG32(ss); |
| |
| R32(ebx, bx); |
| R32(ecx, cx); |
| R32(edx, dx); |
| R32(edi, di); |
| R32(esi, si); |
| R32(ebp, bp); |
| R32(eax, ax); |
| R32(orig_eax, orig_ax); |
| R32(eip, ip); |
| R32(esp, sp); |
| |
| case offsetof(struct user32, regs.eflags): |
| return set_flags(child, value); |
| |
| case offsetof(struct user32, u_debugreg[0]) ... |
| offsetof(struct user32, u_debugreg[7]): |
| regno -= offsetof(struct user32, u_debugreg[0]); |
| return ptrace_set_debugreg(child, regno / 4, value); |
| |
| default: |
| if (regno > sizeof(struct user32) || (regno & 3)) |
| return -EIO; |
| |
| /* |
| * Other dummy fields in the virtual user structure |
| * are ignored |
| */ |
| break; |
| } |
| return 0; |
| } |
| |
| #undef R32 |
| #undef SEG32 |
| |
| #define R32(l,q) \ |
| case offsetof(struct user32, regs.l): \ |
| *val = regs->q; break |
| |
| #define SEG32(rs) \ |
| case offsetof(struct user32, regs.rs): \ |
| *val = get_segment_reg(child, \ |
| offsetof(struct user_regs_struct, rs)); \ |
| break |
| |
| static int getreg32(struct task_struct *child, unsigned regno, u32 *val) |
| { |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| switch (regno) { |
| |
| SEG32(ds); |
| SEG32(es); |
| SEG32(fs); |
| SEG32(gs); |
| |
| R32(cs, cs); |
| R32(ss, ss); |
| R32(ebx, bx); |
| R32(ecx, cx); |
| R32(edx, dx); |
| R32(edi, di); |
| R32(esi, si); |
| R32(ebp, bp); |
| R32(eax, ax); |
| R32(orig_eax, orig_ax); |
| R32(eip, ip); |
| R32(esp, sp); |
| |
| case offsetof(struct user32, regs.eflags): |
| *val = get_flags(child); |
| break; |
| |
| case offsetof(struct user32, u_debugreg[0]) ... |
| offsetof(struct user32, u_debugreg[7]): |
| regno -= offsetof(struct user32, u_debugreg[0]); |
| *val = ptrace_get_debugreg(child, regno / 4); |
| break; |
| |
| default: |
| if (regno > sizeof(struct user32) || (regno & 3)) |
| return -EIO; |
| |
| /* |
| * Other dummy fields in the virtual user structure |
| * are ignored |
| */ |
| *val = 0; |
| break; |
| } |
| return 0; |
| } |
| |
| #undef R32 |
| #undef SEG32 |
| |
| static int genregs32_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| if (kbuf) { |
| compat_ulong_t *k = kbuf; |
| while (count > 0) { |
| getreg32(target, pos, k++); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| compat_ulong_t __user *u = ubuf; |
| while (count > 0) { |
| compat_ulong_t word; |
| getreg32(target, pos, &word); |
| if (__put_user(word, u++)) |
| return -EFAULT; |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int genregs32_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| int ret = 0; |
| if (kbuf) { |
| const compat_ulong_t *k = kbuf; |
| while (count > 0 && !ret) { |
| ret = putreg32(target, pos, *k++); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| const compat_ulong_t __user *u = ubuf; |
| while (count > 0 && !ret) { |
| compat_ulong_t word; |
| ret = __get_user(word, u++); |
| if (ret) |
| break; |
| ret = putreg32(target, pos, word); |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| return ret; |
| } |
| |
| static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data) |
| { |
| siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t)); |
| compat_siginfo_t __user *si32 = compat_ptr(data); |
| siginfo_t ssi; |
| int ret; |
| |
| if (request == PTRACE_SETSIGINFO) { |
| memset(&ssi, 0, sizeof(siginfo_t)); |
| ret = copy_siginfo_from_user32(&ssi, si32); |
| if (ret) |
| return ret; |
| if (copy_to_user(si, &ssi, sizeof(siginfo_t))) |
| return -EFAULT; |
| } |
| ret = sys_ptrace(request, pid, addr, (unsigned long)si); |
| if (ret) |
| return ret; |
| if (request == PTRACE_GETSIGINFO) { |
| if (copy_from_user(&ssi, si, sizeof(siginfo_t))) |
| return -EFAULT; |
| ret = copy_siginfo_to_user32(si32, &ssi); |
| } |
| return ret; |
| } |
| |
| asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data) |
| { |
| struct task_struct *child; |
| struct pt_regs *childregs; |
| void __user *datap = compat_ptr(data); |
| int ret; |
| __u32 val; |
| |
| switch (request) { |
| case PTRACE_TRACEME: |
| case PTRACE_ATTACH: |
| case PTRACE_KILL: |
| case PTRACE_CONT: |
| case PTRACE_SINGLESTEP: |
| case PTRACE_SINGLEBLOCK: |
| case PTRACE_DETACH: |
| case PTRACE_SYSCALL: |
| case PTRACE_OLDSETOPTIONS: |
| case PTRACE_SETOPTIONS: |
| case PTRACE_SET_THREAD_AREA: |
| case PTRACE_GET_THREAD_AREA: |
| case PTRACE_BTS_CONFIG: |
| case PTRACE_BTS_STATUS: |
| case PTRACE_BTS_SIZE: |
| case PTRACE_BTS_GET: |
| case PTRACE_BTS_CLEAR: |
| case PTRACE_BTS_DRAIN: |
| return sys_ptrace(request, pid, addr, data); |
| |
| default: |
| return -EINVAL; |
| |
| case PTRACE_PEEKTEXT: |
| case PTRACE_PEEKDATA: |
| case PTRACE_POKEDATA: |
| case PTRACE_POKETEXT: |
| case PTRACE_POKEUSR: |
| case PTRACE_PEEKUSR: |
| case PTRACE_GETREGS: |
| case PTRACE_SETREGS: |
| case PTRACE_SETFPREGS: |
| case PTRACE_GETFPREGS: |
| case PTRACE_SETFPXREGS: |
| case PTRACE_GETFPXREGS: |
| case PTRACE_GETEVENTMSG: |
| break; |
| |
| case PTRACE_SETSIGINFO: |
| case PTRACE_GETSIGINFO: |
| return ptrace32_siginfo(request, pid, addr, data); |
| } |
| |
| child = ptrace_get_task_struct(pid); |
| if (IS_ERR(child)) |
| return PTR_ERR(child); |
| |
| ret = ptrace_check_attach(child, request == PTRACE_KILL); |
| if (ret < 0) |
| goto out; |
| |
| childregs = task_pt_regs(child); |
| |
| switch (request) { |
| case PTRACE_PEEKUSR: |
| ret = getreg32(child, addr, &val); |
| if (ret == 0) |
| ret = put_user(val, (__u32 __user *)datap); |
| break; |
| |
| case PTRACE_POKEUSR: |
| ret = putreg32(child, addr, data); |
| break; |
| |
| case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| return copy_regset_to_user(child, &user_x86_32_view, |
| REGSET_GENERAL, |
| 0, sizeof(struct user_regs_struct32), |
| datap); |
| |
| case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| return copy_regset_from_user(child, &user_x86_32_view, |
| REGSET_GENERAL, 0, |
| sizeof(struct user_regs_struct32), |
| datap); |
| |
| case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| return copy_regset_to_user(child, &user_x86_32_view, |
| REGSET_FP, 0, |
| sizeof(struct user_i387_ia32_struct), |
| datap); |
| |
| case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| return copy_regset_from_user( |
| child, &user_x86_32_view, REGSET_FP, |
| 0, sizeof(struct user_i387_ia32_struct), datap); |
| |
| case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| return copy_regset_to_user(child, &user_x86_32_view, |
| REGSET_XFP, 0, |
| sizeof(struct user32_fxsr_struct), |
| datap); |
| |
| case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| return copy_regset_from_user(child, &user_x86_32_view, |
| REGSET_XFP, 0, |
| sizeof(struct user32_fxsr_struct), |
| datap); |
| |
| default: |
| return compat_ptrace_request(child, request, addr, data); |
| } |
| |
| out: |
| put_task_struct(child); |
| return ret; |
| } |
| |
| #endif /* CONFIG_IA32_EMULATION */ |
| |
| #ifdef CONFIG_X86_64 |
| |
| static const struct user_regset x86_64_regsets[] = { |
| [REGSET_GENERAL] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = sizeof(struct user_regs_struct) / sizeof(long), |
| .size = sizeof(long), .align = sizeof(long), |
| .get = genregs_get, .set = genregs_set |
| }, |
| [REGSET_FP] = { |
| .core_note_type = NT_PRFPREG, |
| .n = sizeof(struct user_i387_struct) / sizeof(long), |
| .size = sizeof(long), .align = sizeof(long), |
| .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| }, |
| }; |
| |
| static const struct user_regset_view user_x86_64_view = { |
| .name = "x86_64", .e_machine = EM_X86_64, |
| .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) |
| }; |
| |
| #else /* CONFIG_X86_32 */ |
| |
| #define user_regs_struct32 user_regs_struct |
| #define genregs32_get genregs_get |
| #define genregs32_set genregs_set |
| |
| #endif /* CONFIG_X86_64 */ |
| |
| #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| static const struct user_regset x86_32_regsets[] = { |
| [REGSET_GENERAL] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = sizeof(struct user_regs_struct32) / sizeof(u32), |
| .size = sizeof(u32), .align = sizeof(u32), |
| .get = genregs32_get, .set = genregs32_set |
| }, |
| [REGSET_FP] = { |
| .core_note_type = NT_PRFPREG, |
| .n = sizeof(struct user_i387_struct) / sizeof(u32), |
| .size = sizeof(u32), .align = sizeof(u32), |
| .active = fpregs_active, .get = fpregs_get, .set = fpregs_set |
| }, |
| [REGSET_XFP] = { |
| .core_note_type = NT_PRXFPREG, |
| .n = sizeof(struct user_i387_struct) / sizeof(u32), |
| .size = sizeof(u32), .align = sizeof(u32), |
| .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| }, |
| [REGSET_TLS] = { |
| .core_note_type = NT_386_TLS, |
| .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
| .size = sizeof(struct user_desc), |
| .align = sizeof(struct user_desc), |
| .active = regset_tls_active, |
| .get = regset_tls_get, .set = regset_tls_set |
| }, |
| }; |
| |
| static const struct user_regset_view user_x86_32_view = { |
| .name = "i386", .e_machine = EM_386, |
| .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) |
| }; |
| #endif |
| |
| const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| { |
| #ifdef CONFIG_IA32_EMULATION |
| if (test_tsk_thread_flag(task, TIF_IA32)) |
| #endif |
| #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| return &user_x86_32_view; |
| #endif |
| #ifdef CONFIG_X86_64 |
| return &user_x86_64_view; |
| #endif |
| } |
| |
| #ifdef CONFIG_X86_32 |
| |
| void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) |
| { |
| struct siginfo info; |
| |
| tsk->thread.trap_no = 1; |
| tsk->thread.error_code = error_code; |
| |
| memset(&info, 0, sizeof(info)); |
| info.si_signo = SIGTRAP; |
| info.si_code = TRAP_BRKPT; |
| |
| /* User-mode ip? */ |
| info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; |
| |
| /* Send us the fake SIGTRAP */ |
| force_sig_info(SIGTRAP, &info, tsk); |
| } |
| |
| /* notification of system call entry/exit |
| * - triggered by current->work.syscall_trace |
| */ |
| __attribute__((regparm(3))) |
| int do_syscall_trace(struct pt_regs *regs, int entryexit) |
| { |
| int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU); |
| /* |
| * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall |
| * interception |
| */ |
| int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP); |
| int ret = 0; |
| |
| /* do the secure computing check first */ |
| if (!entryexit) |
| secure_computing(regs->orig_ax); |
| |
| if (unlikely(current->audit_context)) { |
| if (entryexit) |
| audit_syscall_exit(AUDITSC_RESULT(regs->ax), |
| regs->ax); |
| /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only |
| * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is |
| * not used, entry.S will call us only on syscall exit, not |
| * entry; so when TIF_SYSCALL_AUDIT is used we must avoid |
| * calling send_sigtrap() on syscall entry. |
| * |
| * Note that when PTRACE_SYSEMU_SINGLESTEP is used, |
| * is_singlestep is false, despite his name, so we will still do |
| * the correct thing. |
| */ |
| else if (is_singlestep) |
| goto out; |
| } |
| |
| if (!(current->ptrace & PT_PTRACED)) |
| goto out; |
| |
| /* If a process stops on the 1st tracepoint with SYSCALL_TRACE |
| * and then is resumed with SYSEMU_SINGLESTEP, it will come in |
| * here. We have to check this and return */ |
| if (is_sysemu && entryexit) |
| return 0; |
| |
| /* Fake a debug trap */ |
| if (is_singlestep) |
| send_sigtrap(current, regs, 0); |
| |
| if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu) |
| goto out; |
| |
| /* the 0x80 provides a way for the tracing parent to distinguish |
| between a syscall stop and SIGTRAP delivery */ |
| /* Note that the debugger could change the result of test_thread_flag!*/ |
| 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; |
| } |
| ret = is_sysemu; |
| out: |
| if (unlikely(current->audit_context) && !entryexit) |
| audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax, |
| regs->bx, regs->cx, regs->dx, regs->si); |
| if (ret == 0) |
| return 0; |
| |
| regs->orig_ax = -1; /* force skip of syscall restarting */ |
| if (unlikely(current->audit_context)) |
| audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); |
| return 1; |
| } |
| |
| #else /* CONFIG_X86_64 */ |
| |
| static void syscall_trace(struct pt_regs *regs) |
| { |
| |
| #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; |
| } |
| } |
| |
| asmlinkage void syscall_trace_enter(struct pt_regs *regs) |
| { |
| /* do the secure computing check first */ |
| secure_computing(regs->orig_ax); |
| |
| if (test_thread_flag(TIF_SYSCALL_TRACE) |
| && (current->ptrace & PT_PTRACED)) |
| syscall_trace(regs); |
| |
| if (unlikely(current->audit_context)) { |
| if (test_thread_flag(TIF_IA32)) { |
| audit_syscall_entry(AUDIT_ARCH_I386, |
| regs->orig_ax, |
| regs->bx, regs->cx, |
| regs->dx, regs->si); |
| } else { |
| audit_syscall_entry(AUDIT_ARCH_X86_64, |
| regs->orig_ax, |
| regs->di, regs->si, |
| regs->dx, regs->r10); |
| } |
| } |
| } |
| |
| asmlinkage void syscall_trace_leave(struct pt_regs *regs) |
| { |
| if (unlikely(current->audit_context)) |
| audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); |
| |
| if ((test_thread_flag(TIF_SYSCALL_TRACE) |
| || test_thread_flag(TIF_SINGLESTEP)) |
| && (current->ptrace & PT_PTRACED)) |
| syscall_trace(regs); |
| } |
| |
| #endif /* CONFIG_X86_32 */ |