linux/arch/arm64/kernel/ptrace.c
Linus Torvalds ab074ade9c Merge git://git.infradead.org/users/eparis/audit
Pull audit updates from Eric Paris:
 "So this change across a whole bunch of arches really solves one basic
  problem.  We want to audit when seccomp is killing a process.  seccomp
  hooks in before the audit syscall entry code.  audit_syscall_entry
  took as an argument the arch of the given syscall.  Since the arch is
  part of what makes a syscall number meaningful it's an important part
  of the record, but it isn't available when seccomp shoots the
  syscall...

  For most arch's we have a better way to get the arch (syscall_get_arch)
  So the solution was two fold: Implement syscall_get_arch() everywhere
  there is audit which didn't have it.  Use syscall_get_arch() in the
  seccomp audit code.  Having syscall_get_arch() everywhere meant it was
  a useless flag on the stack and we could get rid of it for the typical
  syscall entry.

  The other changes inside the audit system aren't grand, fixed some
  records that had invalid spaces.  Better locking around the task comm
  field.  Removing some dead functions and structs.  Make some things
  static.  Really minor stuff"

* git://git.infradead.org/users/eparis/audit: (31 commits)
  audit: rename audit_log_remove_rule to disambiguate for trees
  audit: cull redundancy in audit_rule_change
  audit: WARN if audit_rule_change called illegally
  audit: put rule existence check in canonical order
  next: openrisc: Fix build
  audit: get comm using lock to avoid race in string printing
  audit: remove open_arg() function that is never used
  audit: correct AUDIT_GET_FEATURE return message type
  audit: set nlmsg_len for multicast messages.
  audit: use union for audit_field values since they are mutually exclusive
  audit: invalid op= values for rules
  audit: use atomic_t to simplify audit_serial()
  kernel/audit.c: use ARRAY_SIZE instead of sizeof/sizeof[0]
  audit: reduce scope of audit_log_fcaps
  audit: reduce scope of audit_net_id
  audit: arm64: Remove the audit arch argument to audit_syscall_entry
  arm64: audit: Add audit hook in syscall_trace_enter/exit()
  audit: x86: drop arch from __audit_syscall_entry() interface
  sparc: implement is_32bit_task
  sparc: properly conditionalize use of TIF_32BIT
  ...
2014-10-19 16:25:56 -07:00

1139 lines
25 KiB
C

/*
* Based on arch/arm/kernel/ptrace.c
*
* By Ross Biro 1/23/92
* edited by Linus Torvalds
* ARM modifications Copyright (C) 2000 Russell King
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/audit.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/security.h>
#include <linux/init.h>
#include <linux/signal.h>
#include <linux/uaccess.h>
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/elf.h>
#include <asm/compat.h>
#include <asm/debug-monitors.h>
#include <asm/pgtable.h>
#include <asm/syscall.h>
#include <asm/traps.h>
#include <asm/system_misc.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
/*
* TODO: does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
/*
* Called by kernel/ptrace.c when detaching..
*/
void ptrace_disable(struct task_struct *child)
{
}
#ifdef CONFIG_HAVE_HW_BREAKPOINT
/*
* Handle hitting a HW-breakpoint.
*/
static void ptrace_hbptriggered(struct perf_event *bp,
struct perf_sample_data *data,
struct pt_regs *regs)
{
struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
siginfo_t info = {
.si_signo = SIGTRAP,
.si_errno = 0,
.si_code = TRAP_HWBKPT,
.si_addr = (void __user *)(bkpt->trigger),
};
#ifdef CONFIG_COMPAT
int i;
if (!is_compat_task())
goto send_sig;
for (i = 0; i < ARM_MAX_BRP; ++i) {
if (current->thread.debug.hbp_break[i] == bp) {
info.si_errno = (i << 1) + 1;
break;
}
}
for (i = 0; i < ARM_MAX_WRP; ++i) {
if (current->thread.debug.hbp_watch[i] == bp) {
info.si_errno = -((i << 1) + 1);
break;
}
}
send_sig:
#endif
force_sig_info(SIGTRAP, &info, current);
}
/*
* Unregister breakpoints from this task and reset the pointers in
* the thread_struct.
*/
void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
{
int i;
struct thread_struct *t = &tsk->thread;
for (i = 0; i < ARM_MAX_BRP; i++) {
if (t->debug.hbp_break[i]) {
unregister_hw_breakpoint(t->debug.hbp_break[i]);
t->debug.hbp_break[i] = NULL;
}
}
for (i = 0; i < ARM_MAX_WRP; i++) {
if (t->debug.hbp_watch[i]) {
unregister_hw_breakpoint(t->debug.hbp_watch[i]);
t->debug.hbp_watch[i] = NULL;
}
}
}
void ptrace_hw_copy_thread(struct task_struct *tsk)
{
memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
}
static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx)
{
struct perf_event *bp = ERR_PTR(-EINVAL);
switch (note_type) {
case NT_ARM_HW_BREAK:
if (idx < ARM_MAX_BRP)
bp = tsk->thread.debug.hbp_break[idx];
break;
case NT_ARM_HW_WATCH:
if (idx < ARM_MAX_WRP)
bp = tsk->thread.debug.hbp_watch[idx];
break;
}
return bp;
}
static int ptrace_hbp_set_event(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx,
struct perf_event *bp)
{
int err = -EINVAL;
switch (note_type) {
case NT_ARM_HW_BREAK:
if (idx < ARM_MAX_BRP) {
tsk->thread.debug.hbp_break[idx] = bp;
err = 0;
}
break;
case NT_ARM_HW_WATCH:
if (idx < ARM_MAX_WRP) {
tsk->thread.debug.hbp_watch[idx] = bp;
err = 0;
}
break;
}
return err;
}
static struct perf_event *ptrace_hbp_create(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx)
{
struct perf_event *bp;
struct perf_event_attr attr;
int err, type;
switch (note_type) {
case NT_ARM_HW_BREAK:
type = HW_BREAKPOINT_X;
break;
case NT_ARM_HW_WATCH:
type = HW_BREAKPOINT_RW;
break;
default:
return ERR_PTR(-EINVAL);
}
ptrace_breakpoint_init(&attr);
/*
* Initialise fields to sane defaults
* (i.e. values that will pass validation).
*/
attr.bp_addr = 0;
attr.bp_len = HW_BREAKPOINT_LEN_4;
attr.bp_type = type;
attr.disabled = 1;
bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
if (IS_ERR(bp))
return bp;
err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
if (err)
return ERR_PTR(err);
return bp;
}
static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
struct arch_hw_breakpoint_ctrl ctrl,
struct perf_event_attr *attr)
{
int err, len, type, disabled = !ctrl.enabled;
attr->disabled = disabled;
if (disabled)
return 0;
err = arch_bp_generic_fields(ctrl, &len, &type);
if (err)
return err;
switch (note_type) {
case NT_ARM_HW_BREAK:
if ((type & HW_BREAKPOINT_X) != type)
return -EINVAL;
break;
case NT_ARM_HW_WATCH:
if ((type & HW_BREAKPOINT_RW) != type)
return -EINVAL;
break;
default:
return -EINVAL;
}
attr->bp_len = len;
attr->bp_type = type;
return 0;
}
static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
{
u8 num;
u32 reg = 0;
switch (note_type) {
case NT_ARM_HW_BREAK:
num = hw_breakpoint_slots(TYPE_INST);
break;
case NT_ARM_HW_WATCH:
num = hw_breakpoint_slots(TYPE_DATA);
break;
default:
return -EINVAL;
}
reg |= debug_monitors_arch();
reg <<= 8;
reg |= num;
*info = reg;
return 0;
}
static int ptrace_hbp_get_ctrl(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx,
u32 *ctrl)
{
struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
if (IS_ERR(bp))
return PTR_ERR(bp);
*ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
return 0;
}
static int ptrace_hbp_get_addr(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx,
u64 *addr)
{
struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
if (IS_ERR(bp))
return PTR_ERR(bp);
*addr = bp ? bp->attr.bp_addr : 0;
return 0;
}
static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx)
{
struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
if (!bp)
bp = ptrace_hbp_create(note_type, tsk, idx);
return bp;
}
static int ptrace_hbp_set_ctrl(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx,
u32 uctrl)
{
int err;
struct perf_event *bp;
struct perf_event_attr attr;
struct arch_hw_breakpoint_ctrl ctrl;
bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
if (IS_ERR(bp)) {
err = PTR_ERR(bp);
return err;
}
attr = bp->attr;
decode_ctrl_reg(uctrl, &ctrl);
err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
if (err)
return err;
return modify_user_hw_breakpoint(bp, &attr);
}
static int ptrace_hbp_set_addr(unsigned int note_type,
struct task_struct *tsk,
unsigned long idx,
u64 addr)
{
int err;
struct perf_event *bp;
struct perf_event_attr attr;
bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
if (IS_ERR(bp)) {
err = PTR_ERR(bp);
return err;
}
attr = bp->attr;
attr.bp_addr = addr;
err = modify_user_hw_breakpoint(bp, &attr);
return err;
}
#define PTRACE_HBP_ADDR_SZ sizeof(u64)
#define PTRACE_HBP_CTRL_SZ sizeof(u32)
#define PTRACE_HBP_PAD_SZ sizeof(u32)
static int hw_break_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
unsigned int note_type = regset->core_note_type;
int ret, idx = 0, offset, limit;
u32 info, ctrl;
u64 addr;
/* Resource info */
ret = ptrace_hbp_get_resource_info(note_type, &info);
if (ret)
return ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
sizeof(info));
if (ret)
return ret;
/* Pad */
offset = offsetof(struct user_hwdebug_state, pad);
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
offset + PTRACE_HBP_PAD_SZ);
if (ret)
return ret;
/* (address, ctrl) registers */
offset = offsetof(struct user_hwdebug_state, dbg_regs);
limit = regset->n * regset->size;
while (count && offset < limit) {
ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
if (ret)
return ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
offset, offset + PTRACE_HBP_ADDR_SZ);
if (ret)
return ret;
offset += PTRACE_HBP_ADDR_SZ;
ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
if (ret)
return ret;
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
offset, offset + PTRACE_HBP_CTRL_SZ);
if (ret)
return ret;
offset += PTRACE_HBP_CTRL_SZ;
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
offset,
offset + PTRACE_HBP_PAD_SZ);
if (ret)
return ret;
offset += PTRACE_HBP_PAD_SZ;
idx++;
}
return 0;
}
static int hw_break_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned int note_type = regset->core_note_type;
int ret, idx = 0, offset, limit;
u32 ctrl;
u64 addr;
/* Resource info and pad */
offset = offsetof(struct user_hwdebug_state, dbg_regs);
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
if (ret)
return ret;
/* (address, ctrl) registers */
limit = regset->n * regset->size;
while (count && offset < limit) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
offset, offset + PTRACE_HBP_ADDR_SZ);
if (ret)
return ret;
ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
if (ret)
return ret;
offset += PTRACE_HBP_ADDR_SZ;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
offset, offset + PTRACE_HBP_CTRL_SZ);
if (ret)
return ret;
ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
if (ret)
return ret;
offset += PTRACE_HBP_CTRL_SZ;
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
offset,
offset + PTRACE_HBP_PAD_SZ);
if (ret)
return ret;
offset += PTRACE_HBP_PAD_SZ;
idx++;
}
return 0;
}
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
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 user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
}
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)
{
int ret;
struct user_pt_regs newregs;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
if (ret)
return ret;
if (!valid_user_regs(&newregs))
return -EINVAL;
task_pt_regs(target)->user_regs = newregs;
return 0;
}
/*
* TODO: update fp accessors for lazy context switching (sync/flush hwstate)
*/
static int fpr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct user_fpsimd_state *uregs;
uregs = &target->thread.fpsimd_state.user_fpsimd;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
}
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)
{
int ret;
struct user_fpsimd_state newstate;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
if (ret)
return ret;
target->thread.fpsimd_state.user_fpsimd = newstate;
fpsimd_flush_task_state(target);
return ret;
}
static int tls_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
unsigned long *tls = &target->thread.tp_value;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
}
static int tls_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;
unsigned long tls;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret)
return ret;
target->thread.tp_value = tls;
return ret;
}
enum aarch64_regset {
REGSET_GPR,
REGSET_FPR,
REGSET_TLS,
#ifdef CONFIG_HAVE_HW_BREAKPOINT
REGSET_HW_BREAK,
REGSET_HW_WATCH,
#endif
};
static const struct user_regset aarch64_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = sizeof(struct user_pt_regs) / sizeof(u64),
.size = sizeof(u64),
.align = sizeof(u64),
.get = gpr_get,
.set = gpr_set
},
[REGSET_FPR] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct user_fpsimd_state) / sizeof(u32),
/*
* We pretend we have 32-bit registers because the fpsr and
* fpcr are 32-bits wide.
*/
.size = sizeof(u32),
.align = sizeof(u32),
.get = fpr_get,
.set = fpr_set
},
[REGSET_TLS] = {
.core_note_type = NT_ARM_TLS,
.n = 1,
.size = sizeof(void *),
.align = sizeof(void *),
.get = tls_get,
.set = tls_set,
},
#ifdef CONFIG_HAVE_HW_BREAKPOINT
[REGSET_HW_BREAK] = {
.core_note_type = NT_ARM_HW_BREAK,
.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
.size = sizeof(u32),
.align = sizeof(u32),
.get = hw_break_get,
.set = hw_break_set,
},
[REGSET_HW_WATCH] = {
.core_note_type = NT_ARM_HW_WATCH,
.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
.size = sizeof(u32),
.align = sizeof(u32),
.get = hw_break_get,
.set = hw_break_set,
},
#endif
};
static const struct user_regset_view user_aarch64_view = {
.name = "aarch64", .e_machine = EM_AARCH64,
.regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
};
#ifdef CONFIG_COMPAT
#include <linux/compat.h>
enum compat_regset {
REGSET_COMPAT_GPR,
REGSET_COMPAT_VFP,
};
static int compat_gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret = 0;
unsigned int i, start, num_regs;
/* Calculate the number of AArch32 registers contained in count */
num_regs = count / regset->size;
/* Convert pos into an register number */
start = pos / regset->size;
if (start + num_regs > regset->n)
return -EIO;
for (i = 0; i < num_regs; ++i) {
unsigned int idx = start + i;
compat_ulong_t reg;
switch (idx) {
case 15:
reg = task_pt_regs(target)->pc;
break;
case 16:
reg = task_pt_regs(target)->pstate;
break;
case 17:
reg = task_pt_regs(target)->orig_x0;
break;
default:
reg = task_pt_regs(target)->regs[idx];
}
if (kbuf) {
memcpy(kbuf, &reg, sizeof(reg));
kbuf += sizeof(reg);
} else {
ret = copy_to_user(ubuf, &reg, sizeof(reg));
if (ret) {
ret = -EFAULT;
break;
}
ubuf += sizeof(reg);
}
}
return ret;
}
static int compat_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 = 0;
unsigned int i, start, num_regs;
/* Calculate the number of AArch32 registers contained in count */
num_regs = count / regset->size;
/* Convert pos into an register number */
start = pos / regset->size;
if (start + num_regs > regset->n)
return -EIO;
newregs = *task_pt_regs(target);
for (i = 0; i < num_regs; ++i) {
unsigned int idx = start + i;
compat_ulong_t reg;
if (kbuf) {
memcpy(&reg, kbuf, sizeof(reg));
kbuf += sizeof(reg);
} else {
ret = copy_from_user(&reg, ubuf, sizeof(reg));
if (ret) {
ret = -EFAULT;
break;
}
ubuf += sizeof(reg);
}
switch (idx) {
case 15:
newregs.pc = reg;
break;
case 16:
newregs.pstate = reg;
break;
case 17:
newregs.orig_x0 = reg;
break;
default:
newregs.regs[idx] = reg;
}
}
if (valid_user_regs(&newregs.user_regs))
*task_pt_regs(target) = newregs;
else
ret = -EINVAL;
return ret;
}
static int compat_vfp_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct user_fpsimd_state *uregs;
compat_ulong_t fpscr;
int ret;
uregs = &target->thread.fpsimd_state.user_fpsimd;
/*
* The VFP registers are packed into the fpsimd_state, so they all sit
* nicely together for us. We just need to create the fpscr separately.
*/
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
VFP_STATE_SIZE - sizeof(compat_ulong_t));
if (count && !ret) {
fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
(uregs->fpcr & VFP_FPSCR_CTRL_MASK);
ret = put_user(fpscr, (compat_ulong_t *)ubuf);
}
return ret;
}
static int compat_vfp_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct user_fpsimd_state *uregs;
compat_ulong_t fpscr;
int ret;
if (pos + count > VFP_STATE_SIZE)
return -EIO;
uregs = &target->thread.fpsimd_state.user_fpsimd;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
VFP_STATE_SIZE - sizeof(compat_ulong_t));
if (count && !ret) {
ret = get_user(fpscr, (compat_ulong_t *)ubuf);
uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
}
fpsimd_flush_task_state(target);
return ret;
}
static const struct user_regset aarch32_regsets[] = {
[REGSET_COMPAT_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = COMPAT_ELF_NGREG,
.size = sizeof(compat_elf_greg_t),
.align = sizeof(compat_elf_greg_t),
.get = compat_gpr_get,
.set = compat_gpr_set
},
[REGSET_COMPAT_VFP] = {
.core_note_type = NT_ARM_VFP,
.n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
.size = sizeof(compat_ulong_t),
.align = sizeof(compat_ulong_t),
.get = compat_vfp_get,
.set = compat_vfp_set
},
};
static const struct user_regset_view user_aarch32_view = {
.name = "aarch32", .e_machine = EM_ARM,
.regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
};
static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
compat_ulong_t __user *ret)
{
compat_ulong_t tmp;
if (off & 3)
return -EIO;
if (off == COMPAT_PT_TEXT_ADDR)
tmp = tsk->mm->start_code;
else if (off == COMPAT_PT_DATA_ADDR)
tmp = tsk->mm->start_data;
else if (off == COMPAT_PT_TEXT_END_ADDR)
tmp = tsk->mm->end_code;
else if (off < sizeof(compat_elf_gregset_t))
return copy_regset_to_user(tsk, &user_aarch32_view,
REGSET_COMPAT_GPR, off,
sizeof(compat_ulong_t), ret);
else if (off >= COMPAT_USER_SZ)
return -EIO;
else
tmp = 0;
return put_user(tmp, ret);
}
static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
compat_ulong_t val)
{
int ret;
mm_segment_t old_fs = get_fs();
if (off & 3 || off >= COMPAT_USER_SZ)
return -EIO;
if (off >= sizeof(compat_elf_gregset_t))
return 0;
set_fs(KERNEL_DS);
ret = copy_regset_from_user(tsk, &user_aarch32_view,
REGSET_COMPAT_GPR, off,
sizeof(compat_ulong_t),
&val);
set_fs(old_fs);
return ret;
}
#ifdef CONFIG_HAVE_HW_BREAKPOINT
/*
* Convert a virtual register number into an index for a thread_info
* breakpoint array. Breakpoints are identified using positive numbers
* whilst watchpoints are negative. The registers are laid out as pairs
* of (address, control), each pair mapping to a unique hw_breakpoint struct.
* Register 0 is reserved for describing resource information.
*/
static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
{
return (abs(num) - 1) >> 1;
}
static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
{
u8 num_brps, num_wrps, debug_arch, wp_len;
u32 reg = 0;
num_brps = hw_breakpoint_slots(TYPE_INST);
num_wrps = hw_breakpoint_slots(TYPE_DATA);
debug_arch = debug_monitors_arch();
wp_len = 8;
reg |= debug_arch;
reg <<= 8;
reg |= wp_len;
reg <<= 8;
reg |= num_wrps;
reg <<= 8;
reg |= num_brps;
*kdata = reg;
return 0;
}
static int compat_ptrace_hbp_get(unsigned int note_type,
struct task_struct *tsk,
compat_long_t num,
u32 *kdata)
{
u64 addr = 0;
u32 ctrl = 0;
int err, idx = compat_ptrace_hbp_num_to_idx(num);;
if (num & 1) {
err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
*kdata = (u32)addr;
} else {
err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
*kdata = ctrl;
}
return err;
}
static int compat_ptrace_hbp_set(unsigned int note_type,
struct task_struct *tsk,
compat_long_t num,
u32 *kdata)
{
u64 addr;
u32 ctrl;
int err, idx = compat_ptrace_hbp_num_to_idx(num);
if (num & 1) {
addr = *kdata;
err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
} else {
ctrl = *kdata;
err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
}
return err;
}
static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
compat_ulong_t __user *data)
{
int ret;
u32 kdata;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
/* Watchpoint */
if (num < 0) {
ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
/* Resource info */
} else if (num == 0) {
ret = compat_ptrace_hbp_get_resource_info(&kdata);
/* Breakpoint */
} else {
ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
}
set_fs(old_fs);
if (!ret)
ret = put_user(kdata, data);
return ret;
}
static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
compat_ulong_t __user *data)
{
int ret;
u32 kdata = 0;
mm_segment_t old_fs = get_fs();
if (num == 0)
return 0;
ret = get_user(kdata, data);
if (ret)
return ret;
set_fs(KERNEL_DS);
if (num < 0)
ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
else
ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
set_fs(old_fs);
return ret;
}
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
unsigned long addr = caddr;
unsigned long data = cdata;
void __user *datap = compat_ptr(data);
int ret;
switch (request) {
case PTRACE_PEEKUSR:
ret = compat_ptrace_read_user(child, addr, datap);
break;
case PTRACE_POKEUSR:
ret = compat_ptrace_write_user(child, addr, data);
break;
case COMPAT_PTRACE_GETREGS:
ret = copy_regset_to_user(child,
&user_aarch32_view,
REGSET_COMPAT_GPR,
0, sizeof(compat_elf_gregset_t),
datap);
break;
case COMPAT_PTRACE_SETREGS:
ret = copy_regset_from_user(child,
&user_aarch32_view,
REGSET_COMPAT_GPR,
0, sizeof(compat_elf_gregset_t),
datap);
break;
case COMPAT_PTRACE_GET_THREAD_AREA:
ret = put_user((compat_ulong_t)child->thread.tp_value,
(compat_ulong_t __user *)datap);
break;
case COMPAT_PTRACE_SET_SYSCALL:
task_pt_regs(child)->syscallno = data;
ret = 0;
break;
case COMPAT_PTRACE_GETVFPREGS:
ret = copy_regset_to_user(child,
&user_aarch32_view,
REGSET_COMPAT_VFP,
0, VFP_STATE_SIZE,
datap);
break;
case COMPAT_PTRACE_SETVFPREGS:
ret = copy_regset_from_user(child,
&user_aarch32_view,
REGSET_COMPAT_VFP,
0, VFP_STATE_SIZE,
datap);
break;
#ifdef CONFIG_HAVE_HW_BREAKPOINT
case COMPAT_PTRACE_GETHBPREGS:
ret = compat_ptrace_gethbpregs(child, addr, datap);
break;
case COMPAT_PTRACE_SETHBPREGS:
ret = compat_ptrace_sethbpregs(child, addr, datap);
break;
#endif
default:
ret = compat_ptrace_request(child, request, addr,
data);
break;
}
return ret;
}
#endif /* CONFIG_COMPAT */
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
#ifdef CONFIG_COMPAT
if (is_compat_thread(task_thread_info(task)))
return &user_aarch32_view;
#endif
return &user_aarch64_view;
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
return ptrace_request(child, request, addr, data);
}
enum ptrace_syscall_dir {
PTRACE_SYSCALL_ENTER = 0,
PTRACE_SYSCALL_EXIT,
};
static void tracehook_report_syscall(struct pt_regs *regs,
enum ptrace_syscall_dir dir)
{
int regno;
unsigned long saved_reg;
/*
* A scratch register (ip(r12) on AArch32, x7 on AArch64) is
* used to denote syscall entry/exit:
*/
regno = (is_compat_task() ? 12 : 7);
saved_reg = regs->regs[regno];
regs->regs[regno] = dir;
if (dir == PTRACE_SYSCALL_EXIT)
tracehook_report_syscall_exit(regs, 0);
else if (tracehook_report_syscall_entry(regs))
regs->syscallno = ~0UL;
regs->regs[regno] = saved_reg;
}
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, regs->syscallno);
audit_syscall_entry(regs->syscallno, regs->orig_x0, regs->regs[1],
regs->regs[2], regs->regs[3]);
return regs->syscallno;
}
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
audit_syscall_exit(regs);
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_exit(regs, regs_return_value(regs));
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
}