diff options
Diffstat (limited to 'arch/mips/kernel/ptrace.c')
| -rw-r--r-- | arch/mips/kernel/ptrace.c | 616 |
1 files changed, 395 insertions, 221 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 510da5fda56..f639ccd5060 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -14,19 +14,22 @@ * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit * binaries. */ -#include <linux/config.h> #include <linux/compiler.h> +#include <linux/context_tracking.h> +#include <linux/elf.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/ptrace.h> -#include <linux/audit.h> +#include <linux/regset.h> #include <linux/smp.h> -#include <linux/smp_lock.h> #include <linux/user.h> #include <linux/security.h> -#include <linux/signal.h> +#include <linux/tracehook.h> +#include <linux/audit.h> +#include <linux/seccomp.h> +#include <linux/ftrace.h> #include <asm/byteorder.h> #include <asm/cpu.h> @@ -36,11 +39,14 @@ #include <asm/mipsmtregs.h> #include <asm/pgtable.h> #include <asm/page.h> -#include <asm/system.h> +#include <asm/syscall.h> #include <asm/uaccess.h> #include <asm/bootinfo.h> #include <asm/reg.h> +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + /* * Called by kernel/ptrace.c when detaching.. * @@ -48,15 +54,16 @@ */ void ptrace_disable(struct task_struct *child) { - /* Nothing to do.. */ + /* Don't load the watchpoint registers for the ex-child. */ + clear_tsk_thread_flag(child, TIF_LOAD_WATCH); } /* - * Read a general register set. We always use the 64-bit format, even + * Read a general register set. We always use the 64-bit format, even * for 32-bit kernels and for 32-bit processes on a 64-bit kernel. * Registers are sign extended to fill the available space. */ -int ptrace_getregs (struct task_struct *child, __s64 __user *data) +int ptrace_getregs(struct task_struct *child, __s64 __user *data) { struct pt_regs *regs; int i; @@ -64,17 +71,16 @@ int ptrace_getregs (struct task_struct *child, __s64 __user *data) if (!access_ok(VERIFY_WRITE, data, 38 * 8)) return -EIO; - regs = (struct pt_regs *) ((unsigned long) child->thread_info + - THREAD_SIZE - 32 - sizeof(struct pt_regs)); + regs = task_pt_regs(child); for (i = 0; i < 32; i++) - __put_user (regs->regs[i], data + i); - __put_user (regs->lo, data + EF_LO - EF_R0); - __put_user (regs->hi, data + EF_HI - EF_R0); - __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); - __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0); - __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0); - __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0); + __put_user((long)regs->regs[i], data + i); + __put_user((long)regs->lo, data + EF_LO - EF_R0); + __put_user((long)regs->hi, data + EF_HI - EF_R0); + __put_user((long)regs->cp0_epc, data + EF_CP0_EPC - EF_R0); + __put_user((long)regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0); + __put_user((long)regs->cp0_status, data + EF_CP0_STATUS - EF_R0); + __put_user((long)regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0); return 0; } @@ -84,7 +90,7 @@ int ptrace_getregs (struct task_struct *child, __s64 __user *data) * the 64-bit format. On a 32-bit kernel only the lower order half * (according to endianness) will be used. */ -int ptrace_setregs (struct task_struct *child, __s64 __user *data) +int ptrace_setregs(struct task_struct *child, __s64 __user *data) { struct pt_regs *regs; int i; @@ -92,21 +98,20 @@ int ptrace_setregs (struct task_struct *child, __s64 __user *data) if (!access_ok(VERIFY_READ, data, 38 * 8)) return -EIO; - regs = (struct pt_regs *) ((unsigned long) child->thread_info + - THREAD_SIZE - 32 - sizeof(struct pt_regs)); + regs = task_pt_regs(child); for (i = 0; i < 32; i++) - __get_user (regs->regs[i], data + i); - __get_user (regs->lo, data + EF_LO - EF_R0); - __get_user (regs->hi, data + EF_HI - EF_R0); - __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); + __get_user(regs->regs[i], data + i); + __get_user(regs->lo, data + EF_LO - EF_R0); + __get_user(regs->hi, data + EF_HI - EF_R0); + __get_user(regs->cp0_epc, data + EF_CP0_EPC - EF_R0); /* badvaddr, status, and cause may not be written. */ return 0; } -int ptrace_getfpregs (struct task_struct *child, __u32 __user *data) +int ptrace_getfpregs(struct task_struct *child, __u32 __user *data) { int i; @@ -114,92 +119,314 @@ int ptrace_getfpregs (struct task_struct *child, __u32 __user *data) return -EIO; if (tsk_used_math(child)) { - fpureg_t *fregs = get_fpu_regs(child); + union fpureg *fregs = get_fpu_regs(child); for (i = 0; i < 32; i++) - __put_user (fregs[i], i + (__u64 __user *) data); + __put_user(get_fpr64(&fregs[i], 0), + i + (__u64 __user *)data); } else { for (i = 0; i < 32; i++) - __put_user ((__u64) -1, i + (__u64 __user *) data); + __put_user((__u64) -1, i + (__u64 __user *) data); } - if (cpu_has_fpu) { - unsigned int flags, tmp; + __put_user(child->thread.fpu.fcr31, data + 64); + __put_user(current_cpu_data.fpu_id, data + 65); - __put_user (child->thread.fpu.hard.fcr31, data + 64); + return 0; +} - preempt_disable(); - if (cpu_has_mipsmt) { - unsigned int vpflags = dvpe(); - flags = read_c0_status(); - __enable_fpu(); - __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp)); - write_c0_status(flags); - evpe(vpflags); - } else { - flags = read_c0_status(); - __enable_fpu(); - __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp)); - write_c0_status(flags); - } - preempt_enable(); - __put_user (tmp, data + 65); - } else { - __put_user (child->thread.fpu.soft.fcr31, data + 64); - __put_user ((__u32) 0, data + 65); +int ptrace_setfpregs(struct task_struct *child, __u32 __user *data) +{ + union fpureg *fregs; + u64 fpr_val; + int i; + + if (!access_ok(VERIFY_READ, data, 33 * 8)) + return -EIO; + + fregs = get_fpu_regs(child); + + for (i = 0; i < 32; i++) { + __get_user(fpr_val, i + (__u64 __user *)data); + set_fpr64(&fregs[i], 0, fpr_val); } + __get_user(child->thread.fpu.fcr31, data + 64); + + /* FIR may not be written. */ + return 0; } -int ptrace_setfpregs (struct task_struct *child, __u32 __user *data) +int ptrace_get_watch_regs(struct task_struct *child, + struct pt_watch_regs __user *addr) { - fpureg_t *fregs; + enum pt_watch_style style; int i; - if (!access_ok(VERIFY_READ, data, 33 * 8)) + if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) + return -EIO; + if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs))) return -EIO; - fregs = get_fpu_regs(child); +#ifdef CONFIG_32BIT + style = pt_watch_style_mips32; +#define WATCH_STYLE mips32 +#else + style = pt_watch_style_mips64; +#define WATCH_STYLE mips64 +#endif - for (i = 0; i < 32; i++) - __get_user (fregs[i], i + (__u64 __user *) data); + __put_user(style, &addr->style); + __put_user(boot_cpu_data.watch_reg_use_cnt, + &addr->WATCH_STYLE.num_valid); + for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { + __put_user(child->thread.watch.mips3264.watchlo[i], + &addr->WATCH_STYLE.watchlo[i]); + __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff, + &addr->WATCH_STYLE.watchhi[i]); + __put_user(boot_cpu_data.watch_reg_masks[i], + &addr->WATCH_STYLE.watch_masks[i]); + } + for (; i < 8; i++) { + __put_user(0, &addr->WATCH_STYLE.watchlo[i]); + __put_user(0, &addr->WATCH_STYLE.watchhi[i]); + __put_user(0, &addr->WATCH_STYLE.watch_masks[i]); + } + + return 0; +} - if (cpu_has_fpu) - __get_user (child->thread.fpu.hard.fcr31, data + 64); +int ptrace_set_watch_regs(struct task_struct *child, + struct pt_watch_regs __user *addr) +{ + int i; + int watch_active = 0; + unsigned long lt[NUM_WATCH_REGS]; + u16 ht[NUM_WATCH_REGS]; + + if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) + return -EIO; + if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs))) + return -EIO; + /* Check the values. */ + for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { + __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]); +#ifdef CONFIG_32BIT + if (lt[i] & __UA_LIMIT) + return -EINVAL; +#else + if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) { + if (lt[i] & 0xffffffff80000000UL) + return -EINVAL; + } else { + if (lt[i] & __UA_LIMIT) + return -EINVAL; + } +#endif + __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]); + if (ht[i] & ~0xff8) + return -EINVAL; + } + /* Install them. */ + for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { + if (lt[i] & 7) + watch_active = 1; + child->thread.watch.mips3264.watchlo[i] = lt[i]; + /* Set the G bit. */ + child->thread.watch.mips3264.watchhi[i] = ht[i]; + } + + if (watch_active) + set_tsk_thread_flag(child, TIF_LOAD_WATCH); else - __get_user (child->thread.fpu.soft.fcr31, data + 64); + clear_tsk_thread_flag(child, TIF_LOAD_WATCH); - /* FIR may not be written. */ + return 0; +} + +/* regset get/set implementations */ + +static int gpr_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + struct pt_regs *regs = task_pt_regs(target); + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + regs, 0, sizeof(*regs)); +} + +static int gpr_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + struct pt_regs newregs; + int ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &newregs, + 0, sizeof(newregs)); + if (ret) + return ret; + + *task_pt_regs(target) = newregs; + + return 0; +} + +static int fpr_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + unsigned i; + int err; + u64 fpr_val; + + /* XXX fcr31 */ + + if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t)) + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + &target->thread.fpu, + 0, sizeof(elf_fpregset_t)); + + for (i = 0; i < NUM_FPU_REGS; i++) { + fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0); + err = user_regset_copyout(&pos, &count, &kbuf, &ubuf, + &fpr_val, i * sizeof(elf_fpreg_t), + (i + 1) * sizeof(elf_fpreg_t)); + if (err) + return err; + } + + return 0; +} + +static int fpr_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + unsigned i; + int err; + u64 fpr_val; + + /* XXX fcr31 */ + + if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t)) + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.fpu, + 0, sizeof(elf_fpregset_t)); + + for (i = 0; i < NUM_FPU_REGS; i++) { + err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &fpr_val, i * sizeof(elf_fpreg_t), + (i + 1) * sizeof(elf_fpreg_t)); + if (err) + return err; + set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val); + } return 0; } -long arch_ptrace(struct task_struct *child, long request, long addr, long data) +enum mips_regset { + REGSET_GPR, + REGSET_FPR, +}; + +static const struct user_regset mips_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, + .n = ELF_NGREG, + .size = sizeof(unsigned int), + .align = sizeof(unsigned int), + .get = gpr_get, + .set = gpr_set, + }, + [REGSET_FPR] = { + .core_note_type = NT_PRFPREG, + .n = ELF_NFPREG, + .size = sizeof(elf_fpreg_t), + .align = sizeof(elf_fpreg_t), + .get = fpr_get, + .set = fpr_set, + }, +}; + +static const struct user_regset_view user_mips_view = { + .name = "mips", + .e_machine = ELF_ARCH, + .ei_osabi = ELF_OSABI, + .regsets = mips_regsets, + .n = ARRAY_SIZE(mips_regsets), +}; + +static const struct user_regset mips64_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, + .n = ELF_NGREG, + .size = sizeof(unsigned long), + .align = sizeof(unsigned long), + .get = gpr_get, + .set = gpr_set, + }, + [REGSET_FPR] = { + .core_note_type = NT_PRFPREG, + .n = ELF_NFPREG, + .size = sizeof(elf_fpreg_t), + .align = sizeof(elf_fpreg_t), + .get = fpr_get, + .set = fpr_set, + }, +}; + +static const struct user_regset_view user_mips64_view = { + .name = "mips", + .e_machine = ELF_ARCH, + .ei_osabi = ELF_OSABI, + .regsets = mips64_regsets, + .n = ARRAY_SIZE(mips_regsets), +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ +#ifdef CONFIG_32BIT + return &user_mips_view; +#endif + +#ifdef CONFIG_MIPS32_O32 + if (test_thread_flag(TIF_32BIT_REGS)) + return &user_mips_view; +#endif + + return &user_mips64_view; +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) { int ret; + void __user *addrp = (void __user *) addr; + void __user *datavp = (void __user *) data; + unsigned long __user *datalp = (void __user *) data; switch (request) { /* when I and D space are separate, these will need to be fixed. */ case PTRACE_PEEKTEXT: /* read word at location addr. */ - case PTRACE_PEEKDATA: { - unsigned long tmp; - int copied; - - copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); - ret = -EIO; - if (copied != sizeof(tmp)) - break; - ret = put_user(tmp,(unsigned long __user *) data); + case PTRACE_PEEKDATA: + ret = generic_ptrace_peekdata(child, addr, data); break; - } /* Read the word at location addr in the USER area. */ case PTRACE_PEEKUSR: { struct pt_regs *regs; + union fpureg *fregs; unsigned long tmp = 0; - regs = (struct pt_regs *) ((unsigned long) child->thread_info + - THREAD_SIZE - 32 - sizeof(struct pt_regs)); + regs = task_pt_regs(child); ret = 0; /* Default return value. */ switch (addr) { @@ -207,26 +434,26 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) tmp = regs->regs[addr]; break; case FPR_BASE ... FPR_BASE + 31: - if (tsk_used_math(child)) { - fpureg_t *fregs = get_fpu_regs(child); + if (!tsk_used_math(child)) { + /* FP not yet used */ + tmp = -1; + break; + } + fregs = get_fpu_regs(child); #ifdef CONFIG_32BIT + if (test_thread_flag(TIF_32BIT_FPREGS)) { /* * The odd registers are actually the high * order bits of the values stored in the even * registers - unless we're using r2k_switch.S. */ - if (addr & 1) - tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); - else - tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); -#endif -#ifdef CONFIG_64BIT - tmp = fregs[addr - FPR_BASE]; -#endif - } else { - tmp = -1; /* FP not yet used */ + tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], + addr & 1); + break; } +#endif + tmp = get_fpr32(&fregs[addr - FPR_BASE], 0); break; case PC: tmp = regs->cp0_epc; @@ -243,35 +470,18 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) case MMLO: tmp = regs->lo; break; +#ifdef CONFIG_CPU_HAS_SMARTMIPS + case ACX: + tmp = regs->acx; + break; +#endif case FPC_CSR: - if (cpu_has_fpu) - tmp = child->thread.fpu.hard.fcr31; - else - tmp = child->thread.fpu.soft.fcr31; + tmp = child->thread.fpu.fcr31; break; - case FPC_EIR: { /* implementation / version register */ - unsigned int flags; - - if (!cpu_has_fpu) - break; - - preempt_disable(); - if (cpu_has_mipsmt) { - unsigned int vpflags = dvpe(); - flags = read_c0_status(); - __enable_fpu(); - __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); - write_c0_status(flags); - evpe(vpflags); - } else { - flags = read_c0_status(); - __enable_fpu(); - __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); - write_c0_status(flags); - } - preempt_enable(); + case FPC_EIR: + /* implementation / version register */ + tmp = current_cpu_data.fpu_id; break; - } case DSP_BASE ... DSP_BASE + 5: { dspreg_t *dregs; @@ -280,12 +490,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = -EIO; goto out; } - if (child->thread.dsp.used_dsp) { - dregs = __get_dsp_regs(child); - tmp = (unsigned long) (dregs[addr - DSP_BASE]); - } else { - tmp = -1; /* DSP registers yet used */ - } + dregs = __get_dsp_regs(child); + tmp = (unsigned long) (dregs[addr - DSP_BASE]); break; } case DSP_CONTROL: @@ -301,56 +507,47 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = -EIO; goto out; } - ret = put_user(tmp, (unsigned long __user *) data); + ret = put_user(tmp, datalp); break; } /* when I and D space are separate, this will have to be fixed. */ case PTRACE_POKETEXT: /* write the word at location addr. */ case PTRACE_POKEDATA: - ret = 0; - if (access_process_vm(child, addr, &data, sizeof(data), 1) - == sizeof(data)) - break; - ret = -EIO; + ret = generic_ptrace_pokedata(child, addr, data); break; case PTRACE_POKEUSR: { struct pt_regs *regs; ret = 0; - regs = (struct pt_regs *) ((unsigned long) child->thread_info + - THREAD_SIZE - 32 - sizeof(struct pt_regs)); + regs = task_pt_regs(child); switch (addr) { case 0 ... 31: regs->regs[addr] = data; break; case FPR_BASE ... FPR_BASE + 31: { - fpureg_t *fregs = get_fpu_regs(child); + union fpureg *fregs = get_fpu_regs(child); if (!tsk_used_math(child)) { /* FP not yet used */ - memset(&child->thread.fpu.hard, ~0, - sizeof(child->thread.fpu.hard)); - child->thread.fpu.hard.fcr31 = 0; + memset(&child->thread.fpu, ~0, + sizeof(child->thread.fpu)); + child->thread.fpu.fcr31 = 0; } #ifdef CONFIG_32BIT - /* - * The odd registers are actually the high order bits - * of the values stored in the even registers - unless - * we're using r2k_switch.S. - */ - if (addr & 1) { - fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; - fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; - } else { - fregs[addr - FPR_BASE] &= ~0xffffffffLL; - fregs[addr - FPR_BASE] |= data; + if (test_thread_flag(TIF_32BIT_FPREGS)) { + /* + * The odd registers are actually the high + * order bits of the values stored in the even + * registers - unless we're using r2k_switch.S. + */ + set_fpr32(&fregs[(addr & ~1) - FPR_BASE], + addr & 1, data); + break; } #endif -#ifdef CONFIG_64BIT - fregs[addr - FPR_BASE] = data; -#endif + set_fpr64(&fregs[addr - FPR_BASE], 0, data); break; } case PC: @@ -362,11 +559,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) case MMLO: regs->lo = data; break; +#ifdef CONFIG_CPU_HAS_SMARTMIPS + case ACX: + regs->acx = data; + break; +#endif case FPC_CSR: - if (cpu_has_fpu) - child->thread.fpu.hard.fcr31 = data; - else - child->thread.fpu.soft.fcr31 = data; + child->thread.fpu.fcr31 = data; break; case DSP_BASE ... DSP_BASE + 5: { dspreg_t *dregs; @@ -396,58 +595,31 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) } case PTRACE_GETREGS: - ret = ptrace_getregs (child, (__u64 __user *) data); + ret = ptrace_getregs(child, datavp); break; case PTRACE_SETREGS: - ret = ptrace_setregs (child, (__u64 __user *) data); + ret = ptrace_setregs(child, datavp); break; case PTRACE_GETFPREGS: - ret = ptrace_getfpregs (child, (__u32 __user *) data); + ret = ptrace_getfpregs(child, datavp); break; case PTRACE_SETFPREGS: - ret = ptrace_setfpregs (child, (__u32 __user *) data); + ret = ptrace_setfpregs(child, datavp); break; - case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ - case PTRACE_CONT: { /* restart after signal. */ - ret = -EIO; - if (!valid_signal(data)) - break; - if (request == PTRACE_SYSCALL) { - set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - } - else { - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - } - child->exit_code = data; - wake_up_process(child); - ret = 0; - break; - } - - /* - * make the child exit. Best I can do is send it a sigkill. - * perhaps it should be put in the status that it wants to - * exit. - */ - case PTRACE_KILL: - ret = 0; - if (child->exit_state == EXIT_ZOMBIE) /* already dead */ - break; - child->exit_code = SIGKILL; - wake_up_process(child); + case PTRACE_GET_THREAD_AREA: + ret = put_user(task_thread_info(child)->tp_value, datalp); break; - case PTRACE_DETACH: /* detach a process that was attached. */ - ret = ptrace_detach(child, data); + case PTRACE_GET_WATCH_REGS: + ret = ptrace_get_watch_regs(child, addrp); break; - case PTRACE_GET_THREAD_AREA: - ret = put_user(child->thread_info->tp_value, - (unsigned long __user *) data); + case PTRACE_SET_WATCH_REGS: + ret = ptrace_set_watch_regs(child, addrp); break; default: @@ -458,50 +630,52 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) return ret; } -static inline int audit_arch(void) +/* + * Notification of system call entry/exit + * - triggered by current->work.syscall_trace + */ +asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall) { - int arch = EM_MIPS; -#ifdef CONFIG_64BIT - arch |= __AUDIT_ARCH_64BIT; -#endif -#if defined(__LITTLE_ENDIAN) - arch |= __AUDIT_ARCH_LE; -#endif - return arch; + long ret = 0; + user_exit(); + + if (secure_computing(syscall) == -1) + return -1; + + if (test_thread_flag(TIF_SYSCALL_TRACE) && + tracehook_report_syscall_entry(regs)) + ret = -1; + + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_enter(regs, regs->regs[2]); + + audit_syscall_entry(syscall_get_arch(), + syscall, + regs->regs[4], regs->regs[5], + regs->regs[6], regs->regs[7]); + return syscall; } /* * Notification of system call entry/exit * - triggered by current->work.syscall_trace */ -asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit) +asmlinkage void syscall_trace_leave(struct pt_regs *regs) { - if (unlikely(current->audit_context) && entryexit) - audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]), - regs->regs[2]); - - if (!(current->ptrace & PT_PTRACED)) - goto out; - if (!test_thread_flag(TIF_SYSCALL_TRACE)) - goto out; - - /* The 0x80 provides a way for the tracing parent to distinguish - between a syscall stop and SIGTRAP delivery */ - 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 + /* + * We may come here right after calling schedule_user() + * or do_notify_resume(), in which case we can be in RCU + * user mode. */ - if (current->exit_code) { - send_sig(current->exit_code, current, 1); - current->exit_code = 0; - } - out: - if (unlikely(current->audit_context) && !entryexit) - audit_syscall_entry(current, audit_arch(), regs->regs[2], - regs->regs[4], regs->regs[5], - regs->regs[6], regs->regs[7]); + user_exit(); + + audit_syscall_exit(regs); + + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_exit(regs, regs->regs[2]); + + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, 0); + + user_enter(); } |