a7y18lte-ubports/android_kernel_samsung_universal7885
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[S390] ptrace inferior call interactions with TIF_SYSCALL

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The TIF_SYSCALL bit needs to be cleared if the debugger changes the state
of the ptraced process in regard to the presence of a system call.
Otherwise the system call will be restarted although the debugger set up
an inferior call.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-12-01 13:32:15 +01:00
parent 5f894cbb68
commit d9ae6772d3
1 changed files with 3 additions and 5 deletions
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8
arch/s390/kernel/signal.c
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@ -460,9 +460,9 @@ void do_signal(struct pt_regs *regs)
regs->svc_code >> 16); regs->svc_code >> 16);
break; break;
} }
/* No longer in a system call */
clear_thread_flag(TIF_SYSCALL);
} }
/* No longer in a system call */
clear_thread_flag(TIF_SYSCALL);
if ((is_compat_task() ? if ((is_compat_task() ?
handle_signal32(signr, &ka, &info, oldset, regs) : handle_signal32(signr, &ka, &info, oldset, regs) :
@ -486,6 +486,7 @@ void do_signal(struct pt_regs *regs)
} }
/* No handlers present - check for system call restart */ /* No handlers present - check for system call restart */
clear_thread_flag(TIF_SYSCALL);
if (current_thread_info()->system_call) { if (current_thread_info()->system_call) {
regs->svc_code = current_thread_info()->system_call; regs->svc_code = current_thread_info()->system_call;
switch (regs->gprs[2]) { switch (regs->gprs[2]) {
@ -500,9 +501,6 @@ void do_signal(struct pt_regs *regs)
regs->gprs[2] = regs->orig_gpr2; regs->gprs[2] = regs->orig_gpr2;
set_thread_flag(TIF_SYSCALL); set_thread_flag(TIF_SYSCALL);
break; break;
default:
clear_thread_flag(TIF_SYSCALL);
break;
} }
} }