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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 18:16:47 +0400 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 18:16:43 +0400 |
commit | 20b40a794baf3b4b0320c0a77ce944d5d1a01f25 (patch) | |
tree | fb5eb62f8f75d8f6a31aae4c3cff3371f41cdd6d /arch/s390/include/asm/ptrace.h | |
parent | 3ee49c8f123257c72b74f398ef99ac3348c493cc (diff) | |
download | linux-20b40a794baf3b4b0320c0a77ce944d5d1a01f25.tar.xz |
[S390] signal race with restarting system calls
For a ERESTARTNOHAND/ERESTARTSYS/ERESTARTNOINTR restarting system call
do_signal will prepare the restart of the system call with a rewind of
the PSW before calling get_signal_to_deliver (where the debugger might
take control). For A ERESTART_RESTARTBLOCK restarting system call
do_signal will set -EINTR as return code.
There are two issues with this approach:
1) strace never sees ERESTARTNOHAND, ERESTARTSYS, ERESTARTNOINTR or
ERESTART_RESTARTBLOCK as the rewinding already took place or the
return code has been changed to -EINTR
2) if get_signal_to_deliver does not return with a signal to deliver
the restart via the repeat of the svc instruction is left in place.
This opens a race if another signal is made pending before the
system call instruction can be reexecuted. The original system call
will be restarted even if the second signal would have ended the
system call with -EINTR.
These two issues can be solved by dropping the early rewind of the
system call before get_signal_to_deliver has been called and by using
the TIF_RESTART_SVC magic to do the restart if no signal has to be
delivered. The only situation where the system call restart via the
repeat of the svc instruction is appropriate is when a SA_RESTART
signal is delivered to user space.
Unfortunately this breaks inferior calls by the debugger again. The
system call number and the length of the system call instruction is
lost over the inferior call and user space will see ERESTARTNOHAND/
ERESTARTSYS/ERESTARTNOINTR/ERESTART_RESTARTBLOCK. To correct this a
new ptrace interface is added to save/restore the system call number
and system call instruction length.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ptrace.h')
-rw-r--r-- | arch/s390/include/asm/ptrace.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index 62fd80c9e98c..93c907b4776f 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -328,8 +328,7 @@ struct pt_regs psw_t psw; unsigned long gprs[NUM_GPRS]; unsigned long orig_gpr2; - unsigned short ilc; - unsigned short svcnr; + unsigned int svc_code; }; /* @@ -487,6 +486,8 @@ typedef struct #define PTRACE_POKETEXT_AREA 0x5004 #define PTRACE_POKEDATA_AREA 0x5005 #define PTRACE_GET_LAST_BREAK 0x5006 +#define PTRACE_PEEK_SYSTEM_CALL 0x5007 +#define PTRACE_POKE_SYSTEM_CALL 0x5008 /* * PT_PROT definition is loosely based on hppa bsd definition in |