PR/40594 CVS commit: [netbsd-5] src/sys

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

The following reply was made to PR kern/40594; it has been noted by GNATS.

From: "Manuel Bouyer" <bouyer%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/40594 CVS commit: [netbsd-5] src/sys
Date: Sat, 4 Feb 2012 16:58:00 +0000

 Module Name:   src
 Committed By:  bouyer
 Date:          Sat Feb  4 16:58:00 UTC 2012
 
 Modified Files:
        src/sys/arch/amd64/amd64 [netbsd-5]: syscall.c
        src/sys/arch/i386/i386 [netbsd-5]: syscall.c trap.c
        src/sys/kern [netbsd-5]: kern_sig.c kern_sleepq.c kern_subr.c
            sys_process.c
        src/sys/secmodel/bsd44 [netbsd-5]: secmodel_bsd44_suser.c
        src/sys/sys [netbsd-5]: proc.h ptrace.h
 
 Log Message:
 Apply patch, requested by jmcneill in ticket #1668:
        sys/arch/amd64/amd64/syscall.c                  patch
        sys/arch/i386/i386/syscall.c                    patch
        sys/arch/i386/i386/trap.c                       patch
        sys/kern/kern_sig.c                             patch
        sys/kern/kern_sleepq.c                          patch
        sys/kern/kern_subr.c                            patch
        sys/kern/sys_process.c                          patch
        sys/secmodel/bsd44/secmodel_bsd44_suser.c       patch
        sys/sys/proc.h                                  patch
        sys/sys/ptrace.h                                patch
 
 arch/i386/i386/machdep.c, arch/amd64/amd64/machdep.c (from
 arch/x86/x86/machdep.c) by christos:
 Remove code that was used to avoid register spills. setcontext(2) can change
 the registers, so re-fetching will produce the wrong result for trace_exit().
 arch/i386/i386/trap.c by reinoud:
 Fix the illegal instruction return address. It was using the value of the
 cpu's %cr2 register but thats not valid:
 
 CR2 Contains a value called Page Fault Linear Address (PFLA). When a page
 fault occurs, the address the program attempted to access is stored in the CR2
 register.
 
 And this is thus NOT the illegal instruction address!
 kern/kern_sig.c by christos:
 PR kern/45327: Jared McNeill: ptrace: siginfo doesn't work with traced 
processes
 When saving the signal in p->p_xstat, clear it from the pending mask, but
 don't remove it from the siginfo queue, so that next time the debugger
 delivers it, the original information is found.
 When posting a signal from the debugger l->l_sigpendset is not set, so we
 use the process pending signal and add it back to the process pending set.
 Split sigget into sigget() and siggetinfo(). When a signal comes from the
 debugger (l->l_sigpendset == NULL), using siggetinfo() try to fetch the
 siginfo information from l->l_sigpend and then from p->p_sigpend if it
 was not found. This allows us to pass siginfo information for traps from
 the debugger.
 don't delete signal from the debugger.
 kern/kern_sleepq.c by christos:
 PR kern/40594: Antti Kantee: Don't call issignal() here to determine what errno
 to set for the interrupted syscall, because issignal() will consume the signal
 and it will not be delivered to the process afterwards. Instead call
 sigispending() (which now returns the first pending signal) and does not
 consume the signal.
 We need to process SA_STOP signals immediately, and not deliver them to
 the process. Instead of re-structuring the code to do that, call issignal()
 like before in that case. (tail -F /file^Zfg should not get interrupted).
 kern/kern_subr.c by jmcneill, christos:
 PR kern/45312: ptrace: PT_SETREGS can't alter system calls
 
 Add a new PT_SYSCALLEMU request that cancels the current syscall, for
 use with PT_SYSCALL.
 For PT_SYSCALLEMU, no need to stop again on syscall exit.
 ifdef unused variable with -UPTRACE
 
 kern/sys_process.c, sys/proc.h, sys/ptrace.h, 
secmodel/bsd44/secmodel_bsd44_suser.c by jmcneill, christos:
 PR kern/43681: PT_SYSCALL appears to be broken
 
 sys_ptrace: For PT_CONTINUE/PT_SYSCALL/PT_DETACH, modify the p_trace_enabled
 flag of the target process, not the calling process.
 Process the signal now, otherwise calling issignal() and ignoring
 the return will lose the signal if it came from the debugger
 (issignal() clears p->p_xstat)
 PR kern/45312: ptrace: PT_SETREGS can't alter system calls
 
 Add a new PT_SYSCALLEMU request that cancels the current syscall, for
 use with PT_SYSCALL.
 PR kern/45330: ptrace: signals can alter syscall return values
 
 process_stoptrace: defer signal processing to userret, ok christos@
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.44 -r1.44.4.1 src/sys/arch/amd64/amd64/syscall.c
 cvs rdiff -u -r1.57 -r1.57.4.1 src/sys/arch/i386/i386/syscall.c
 cvs rdiff -u -r1.241.4.3 -r1.241.4.4 src/sys/arch/i386/i386/trap.c
 cvs rdiff -u -r1.289.4.6 -r1.289.4.7 src/sys/kern/kern_sig.c
 cvs rdiff -u -r1.35 -r1.35.4.1 src/sys/kern/kern_sleepq.c
 cvs rdiff -u -r1.192.4.1 -r1.192.4.2 src/sys/kern/kern_subr.c
 cvs rdiff -u -r1.143.4.1 -r1.143.4.2 src/sys/kern/sys_process.c
 cvs rdiff -u -r1.59 -r1.59.4.1 src/sys/secmodel/bsd44/secmodel_bsd44_suser.c
 cvs rdiff -u -r1.282 -r1.282.4.1 src/sys/sys/proc.h
 cvs rdiff -u -r1.40 -r1.40.20.1 src/sys/sys/ptrace.h
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.