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/*
* Copyright ( C ) 2000 - 2007 Jeff Dike ( jdike @ { addtoit , linux . intel } . com )
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* Licensed under the GPL
*/
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# include <linux/audit.h>
# include <linux/ptrace.h>
# include <linux/sched.h>
# include <linux/tracehook.h>
# include <asm/uaccess.h>
# include <skas_ptrace.h>
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void user_enable_single_step ( struct task_struct * child )
{
child - > ptrace | = PT_DTRACE ;
child - > thread . singlestep_syscall = 0 ;
# ifdef SUBARCH_SET_SINGLESTEPPING
SUBARCH_SET_SINGLESTEPPING ( child , 1 ) ;
# endif
}
void user_disable_single_step ( struct task_struct * child )
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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{
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child - > ptrace & = ~ PT_DTRACE ;
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child - > thread . singlestep_syscall = 0 ;
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-06 21:30:46 -07:00
# ifdef SUBARCH_SET_SINGLESTEPPING
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SUBARCH_SET_SINGLESTEPPING ( child , 0 ) ;
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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# endif
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}
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-06 21:30:46 -07:00
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/*
* Called by kernel / ptrace . c when detaching . .
*/
void ptrace_disable ( struct task_struct * child )
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{
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user_disable_single_step ( child ) ;
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}
[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-06 21:30:46 -07:00
extern int peek_user ( struct task_struct * child , long addr , long data ) ;
extern int poke_user ( struct task_struct * child , long addr , long data ) ;
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long arch_ptrace ( struct task_struct * child , long request ,
unsigned long addr , unsigned long data )
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{
int i , ret ;
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unsigned long __user * p = ( void __user * ) data ;
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void __user * vp = p ;
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switch ( request ) {
/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR :
ret = peek_user ( child , addr , data ) ;
break ;
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/* write the word at location addr in the USER area */
case PTRACE_POKEUSR :
ret = poke_user ( child , addr , data ) ;
break ;
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case PTRACE_SYSEMU :
case PTRACE_SYSEMU_SINGLESTEP :
ret = - EIO ;
break ;
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# ifdef PTRACE_GETREGS
case PTRACE_GETREGS : { /* Get all gp regs from the child. */
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if ( ! access_ok ( VERIFY_WRITE , p , MAX_REG_OFFSET ) ) {
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ret = - EIO ;
break ;
}
for ( i = 0 ; i < MAX_REG_OFFSET ; i + = sizeof ( long ) ) {
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__put_user ( getreg ( child , i ) , p ) ;
p + + ;
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}
ret = 0 ;
break ;
}
# endif
# ifdef PTRACE_SETREGS
case PTRACE_SETREGS : { /* Set all gp regs in the child. */
unsigned long tmp = 0 ;
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if ( ! access_ok ( VERIFY_READ , p , MAX_REG_OFFSET ) ) {
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ret = - EIO ;
break ;
}
for ( i = 0 ; i < MAX_REG_OFFSET ; i + = sizeof ( long ) ) {
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__get_user ( tmp , p ) ;
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putreg ( child , i , tmp ) ;
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p + + ;
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}
ret = 0 ;
break ;
}
# endif
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case PTRACE_GET_THREAD_AREA :
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ret = ptrace_get_thread_area ( child , addr , vp ) ;
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break ;
case PTRACE_SET_THREAD_AREA :
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ret = ptrace_set_thread_area ( child , addr , vp ) ;
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break ;
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case PTRACE_FAULTINFO : {
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/*
* Take the info from thread - > arch - > faultinfo ,
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* but transfer max . sizeof ( struct ptrace_faultinfo ) .
* On i386 , ptrace_faultinfo is smaller !
*/
ret = copy_to_user ( p , & child - > thread . arch . faultinfo ,
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sizeof ( struct ptrace_faultinfo ) ) ?
- EIO : 0 ;
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break ;
}
[PATCH] uml: S390 preparation, abstract host page fault data
This patch removes the arch-specific fault/trap-infos from thread and
skas-regs.
It adds a new struct faultinfo, that is arch-specific defined in
sysdep/faultinfo.h.
The structure is inserted in thread.arch and thread.regs.skas and
thread.regs.tt
Now, segv and other trap-handlers can copy the contents from regs.X.faultinfo
to thread.arch.faultinfo with one simple assignment.
Also, the number of macros necessary is reduced to
FAULT_ADDRESS(struct faultinfo)
extracts the faulting address from faultinfo
FAULT_WRITE(struct faultinfo)
extracts the "is_write" flag
SEGV_IS_FIXABLE(struct faultinfo)
is true for the fixable segvs, i.e. (TRAP == 14)
on i386
UPT_FAULTINFO(regs)
result is (struct faultinfo *) to the faultinfo
in regs->skas.faultinfo
GET_FAULTINFO_FROM_SC(struct faultinfo, struct sigcontext *)
copies the relevant parts of the sigcontext to
struct faultinfo.
On SIGSEGV, call user_signal() instead of handle_segv(), if the architecture
provides the information needed in PTRACE_FAULTINFO, or if PTRACE_FAULTINFO is
missing, because segv-stub will provide the info.
The benefit of the change is, that in case of a non-fixable SIGSEGV, we can
give user processes a SIGSEGV, instead of possibly looping on pagefault
handling.
Since handle_segv() sikked arch_fixup() implicitly by passing ip==0 to segv(),
I changed segv() to call arch_fixup() only, if !is_user.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-05 16:15:31 -07:00
# ifdef PTRACE_LDT
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case PTRACE_LDT : {
struct ptrace_ldt ldt ;
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if ( copy_from_user ( & ldt , p , sizeof ( ldt ) ) ) {
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ret = - EIO ;
break ;
}
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/*
* This one is confusing , so just punt and return - EIO for
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* now
*/
ret = - EIO ;
break ;
}
# endif
default :
ret = ptrace_request ( child , request , addr , data ) ;
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if ( ret = = - EIO )
ret = subarch_ptrace ( child , request , addr , data ) ;
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break ;
}
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return ret ;
}
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static void send_sigtrap ( struct task_struct * tsk , struct uml_pt_regs * regs ,
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int error_code )
{
struct siginfo info ;
memset ( & info , 0 , sizeof ( info ) ) ;
info . si_signo = SIGTRAP ;
info . si_code = TRAP_BRKPT ;
/* User-mode eip? */
info . si_addr = UPT_IS_USER ( regs ) ? ( void __user * ) UPT_IP ( regs ) : NULL ;
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/* Send us the fake SIGTRAP */
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force_sig_info ( SIGTRAP , & info , tsk ) ;
}
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/*
* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
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* PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
*/
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void syscall_trace_enter ( struct pt_regs * regs )
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{
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audit_syscall_entry ( HOST_AUDIT_ARCH ,
UPT_SYSCALL_NR ( & regs - > regs ) ,
UPT_SYSCALL_ARG1 ( & regs - > regs ) ,
UPT_SYSCALL_ARG2 ( & regs - > regs ) ,
UPT_SYSCALL_ARG3 ( & regs - > regs ) ,
UPT_SYSCALL_ARG4 ( & regs - > regs ) ) ;
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if ( ! test_thread_flag ( TIF_SYSCALL_TRACE ) )
return ;
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tracehook_report_syscall_entry ( regs ) ;
}
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void syscall_trace_leave ( struct pt_regs * regs )
{
int ptraced = current - > ptrace ;
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audit_syscall_exit ( regs ) ;
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/* Fake a debug trap */
if ( ptraced & PT_DTRACE )
send_sigtrap ( current , & regs - > regs , 0 ) ;
if ( ! test_thread_flag ( TIF_SYSCALL_TRACE ) )
return ;
tracehook_report_syscall_exit ( regs , 0 ) ;
/* force do_signal() --> is_syscall() */
if ( ptraced & PT_PTRACED )
set_thread_flag ( TIF_SIGPENDING ) ;
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}