mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 09:59:32 +00:00
![Eric Paris](/assets/img/avatar_default.png)
We have a function where the arch can be queried, syscall_get_arch(). So rather than have every single piece of arch specific code use and/or duplicate syscall_get_arch(), just have the audit code use the syscall_get_arch() code. Based-on-patch-by: Richard Briggs <rgb@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-ia64@vger.kernel.org Cc: microblaze-uclinux@itee.uq.edu.au Cc: linux-mips@linux-mips.org Cc: linux@lists.openrisc.net Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: user-mode-linux-devel@lists.sourceforge.net Cc: linux-xtensa@linux-xtensa.org Cc: x86@kernel.org
354 lines
8.2 KiB
C
354 lines
8.2 KiB
C
// TODO some minor issues
|
|
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001 - 2007 Tensilica Inc.
|
|
*
|
|
* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
|
|
* Chris Zankel <chris@zankel.net>
|
|
* Scott Foehner<sfoehner@yahoo.com>,
|
|
* Kevin Chea
|
|
* Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/security.h>
|
|
#include <linux/signal.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/coprocessor.h>
|
|
|
|
|
|
void user_enable_single_step(struct task_struct *child)
|
|
{
|
|
child->ptrace |= PT_SINGLESTEP;
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *child)
|
|
{
|
|
child->ptrace &= ~PT_SINGLESTEP;
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching to disable single stepping.
|
|
*/
|
|
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* Nothing to do.. */
|
|
}
|
|
|
|
int ptrace_getregs(struct task_struct *child, void __user *uregs)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
xtensa_gregset_t __user *gregset = uregs;
|
|
unsigned long wb = regs->windowbase;
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
|
|
return -EIO;
|
|
|
|
__put_user(regs->pc, &gregset->pc);
|
|
__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
|
|
__put_user(regs->lbeg, &gregset->lbeg);
|
|
__put_user(regs->lend, &gregset->lend);
|
|
__put_user(regs->lcount, &gregset->lcount);
|
|
__put_user(regs->windowstart, &gregset->windowstart);
|
|
__put_user(regs->windowbase, &gregset->windowbase);
|
|
__put_user(regs->threadptr, &gregset->threadptr);
|
|
|
|
for (i = 0; i < XCHAL_NUM_AREGS; i++)
|
|
__put_user(regs->areg[i],
|
|
gregset->a + ((wb * 4 + i) % XCHAL_NUM_AREGS));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ptrace_setregs(struct task_struct *child, void __user *uregs)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
xtensa_gregset_t *gregset = uregs;
|
|
const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
|
|
unsigned long ps;
|
|
unsigned long wb, ws;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
|
|
return -EIO;
|
|
|
|
__get_user(regs->pc, &gregset->pc);
|
|
__get_user(ps, &gregset->ps);
|
|
__get_user(regs->lbeg, &gregset->lbeg);
|
|
__get_user(regs->lend, &gregset->lend);
|
|
__get_user(regs->lcount, &gregset->lcount);
|
|
__get_user(ws, &gregset->windowstart);
|
|
__get_user(wb, &gregset->windowbase);
|
|
__get_user(regs->threadptr, &gregset->threadptr);
|
|
|
|
regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
|
|
|
|
if (wb >= XCHAL_NUM_AREGS / 4)
|
|
return -EFAULT;
|
|
|
|
if (wb != regs->windowbase || ws != regs->windowstart) {
|
|
unsigned long rotws, wmask;
|
|
|
|
rotws = (((ws | (ws << WSBITS)) >> wb) &
|
|
((1 << WSBITS) - 1)) & ~1;
|
|
wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) |
|
|
(rotws & 0xF) | 1;
|
|
regs->windowbase = wb;
|
|
regs->windowstart = ws;
|
|
regs->wmask = wmask;
|
|
}
|
|
|
|
if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
|
|
gregset->a, wb * 16))
|
|
return -EFAULT;
|
|
|
|
if (__copy_from_user(regs->areg, gregset->a + wb * 4,
|
|
(WSBITS - wb) * 16))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ptrace_getxregs(struct task_struct *child, void __user *uregs)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
struct thread_info *ti = task_thread_info(child);
|
|
elf_xtregs_t __user *xtregs = uregs;
|
|
int ret = 0;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
|
|
return -EIO;
|
|
|
|
#if XTENSA_HAVE_COPROCESSORS
|
|
/* Flush all coprocessor registers to memory. */
|
|
coprocessor_flush_all(ti);
|
|
ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
|
|
sizeof(xtregs_coprocessor_t));
|
|
#endif
|
|
ret |= __copy_to_user(&xtregs->opt, ®s->xtregs_opt,
|
|
sizeof(xtregs->opt));
|
|
ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
|
|
sizeof(xtregs->user));
|
|
|
|
return ret ? -EFAULT : 0;
|
|
}
|
|
|
|
int ptrace_setxregs(struct task_struct *child, void __user *uregs)
|
|
{
|
|
struct thread_info *ti = task_thread_info(child);
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
elf_xtregs_t *xtregs = uregs;
|
|
int ret = 0;
|
|
|
|
if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
|
|
return -EFAULT;
|
|
|
|
#if XTENSA_HAVE_COPROCESSORS
|
|
/* Flush all coprocessors before we overwrite them. */
|
|
coprocessor_flush_all(ti);
|
|
coprocessor_release_all(ti);
|
|
|
|
ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
|
|
sizeof(xtregs_coprocessor_t));
|
|
#endif
|
|
ret |= __copy_from_user(®s->xtregs_opt, &xtregs->opt,
|
|
sizeof(xtregs->opt));
|
|
ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
|
|
sizeof(xtregs->user));
|
|
|
|
return ret ? -EFAULT : 0;
|
|
}
|
|
|
|
int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
|
|
{
|
|
struct pt_regs *regs;
|
|
unsigned long tmp;
|
|
|
|
regs = task_pt_regs(child);
|
|
tmp = 0; /* Default return value. */
|
|
|
|
switch(regno) {
|
|
|
|
case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
|
|
tmp = regs->areg[regno - REG_AR_BASE];
|
|
break;
|
|
|
|
case REG_A_BASE ... REG_A_BASE + 15:
|
|
tmp = regs->areg[regno - REG_A_BASE];
|
|
break;
|
|
|
|
case REG_PC:
|
|
tmp = regs->pc;
|
|
break;
|
|
|
|
case REG_PS:
|
|
/* Note: PS.EXCM is not set while user task is running;
|
|
* its being set in regs is for exception handling
|
|
* convenience. */
|
|
tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
|
|
break;
|
|
|
|
case REG_WB:
|
|
break; /* tmp = 0 */
|
|
|
|
case REG_WS:
|
|
{
|
|
unsigned long wb = regs->windowbase;
|
|
unsigned long ws = regs->windowstart;
|
|
tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
|
|
break;
|
|
}
|
|
case REG_LBEG:
|
|
tmp = regs->lbeg;
|
|
break;
|
|
|
|
case REG_LEND:
|
|
tmp = regs->lend;
|
|
break;
|
|
|
|
case REG_LCOUNT:
|
|
tmp = regs->lcount;
|
|
break;
|
|
|
|
case REG_SAR:
|
|
tmp = regs->sar;
|
|
break;
|
|
|
|
case SYSCALL_NR:
|
|
tmp = regs->syscall;
|
|
break;
|
|
|
|
default:
|
|
return -EIO;
|
|
}
|
|
return put_user(tmp, ret);
|
|
}
|
|
|
|
int ptrace_pokeusr(struct task_struct *child, long regno, long val)
|
|
{
|
|
struct pt_regs *regs;
|
|
regs = task_pt_regs(child);
|
|
|
|
switch (regno) {
|
|
case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
|
|
regs->areg[regno - REG_AR_BASE] = val;
|
|
break;
|
|
|
|
case REG_A_BASE ... REG_A_BASE + 15:
|
|
regs->areg[regno - REG_A_BASE] = val;
|
|
break;
|
|
|
|
case REG_PC:
|
|
regs->pc = val;
|
|
break;
|
|
|
|
case SYSCALL_NR:
|
|
regs->syscall = val;
|
|
break;
|
|
|
|
default:
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
int ret = -EPERM;
|
|
void __user *datap = (void __user *) data;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
|
case PTRACE_PEEKDATA:
|
|
ret = generic_ptrace_peekdata(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_PEEKUSR: /* read register specified by addr. */
|
|
ret = ptrace_peekusr(child, addr, datap);
|
|
break;
|
|
|
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
|
case PTRACE_POKEDATA:
|
|
ret = generic_ptrace_pokedata(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR: /* write register specified by addr. */
|
|
ret = ptrace_pokeusr(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_GETREGS:
|
|
ret = ptrace_getregs(child, datap);
|
|
break;
|
|
|
|
case PTRACE_SETREGS:
|
|
ret = ptrace_setregs(child, datap);
|
|
break;
|
|
|
|
case PTRACE_GETXTREGS:
|
|
ret = ptrace_getxregs(child, datap);
|
|
break;
|
|
|
|
case PTRACE_SETXTREGS:
|
|
ret = ptrace_setxregs(child, datap);
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void do_syscall_trace(void)
|
|
{
|
|
/*
|
|
* 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
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|
|
|
|
void do_syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE)
|
|
&& (current->ptrace & PT_PTRACED))
|
|
do_syscall_trace();
|
|
|
|
#if 0
|
|
audit_syscall_entry(...);
|
|
#endif
|
|
}
|
|
|
|
void do_syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
if ((test_thread_flag(TIF_SYSCALL_TRACE))
|
|
&& (current->ptrace & PT_PTRACED))
|
|
do_syscall_trace();
|
|
}
|