uml-2.6.10-fc3.patch

非常经典的一个分布式系统

 	pe_data.stdout = fds[1];
 	pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
 
-	os_close_file(fds[1]);
 	read_output(fds[0], output, output_len);
+	os_close_file(fds[0]);
+	os_close_file(fds[1]);
 
-	CATCH_EINTR(err = waitpid(pid, NULL, 0));
+	if (pid > 0)
+		CATCH_EINTR(err = waitpid(pid, NULL, 0));
 	return(pid);
 }
 
Index: linux-2.6.10/arch/um/os-Linux/process.c
===================================================================
--- linux-2.6.10.orig/arch/um/os-Linux/process.c	2004-12-25 05:34:00.000000000 +0800
+++ linux-2.6.10/arch/um/os-Linux/process.c	2005-04-07 22:14:57.660384000 +0800
@@ -94,10 +94,16 @@
 		CATCH_EINTR(waitpid(pid, NULL, 0));
 		
 }
+/* Kill off a ptraced child by all means available. kill it normally first,
+ * then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
+ * which it can't exit directly.
+ */
 
 void os_kill_ptraced_process(int pid, int reap_child)
 {
+	kill(pid, SIGKILL);
 	ptrace(PTRACE_KILL, pid);
+	ptrace(PTRACE_CONT, pid);
 	if(reap_child)
 		CATCH_EINTR(waitpid(pid, NULL, 0));
 }
Index: linux-2.6.10/arch/um/os-Linux/elf_aux.c
===================================================================
--- linux-2.6.10.orig/arch/um/os-Linux/elf_aux.c	2005-04-07 19:34:21.197950744 +0800
+++ linux-2.6.10/arch/um/os-Linux/elf_aux.c	2005-04-07 22:05:29.478760736 +0800
@@ -0,0 +1,67 @@
+/*
+ *  arch/um/kernel/elf_aux.c
+ *
+ *  Scan the Elf auxiliary vector provided by the host to extract
+ *  information about vsyscall-page, etc.
+ *
+ *  Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ *  Author: Bodo Stroesser ([e-mail])
+ */
+#include <elf.h>
+#include <stddef.h>
+#include "init.h"
+#include "elf_user.h"
+
+#if ELF_CLASS == ELFCLASS32
+typedef Elf32_auxv_t elf_auxv_t;
+#else
+typedef Elf64_auxv_t elf_auxv_t;
+#endif
+
+char * elf_aux_platform;
+long elf_aux_hwcap;
+
+unsigned long vsyscall_ehdr;
+unsigned long vsyscall_end;
+
+unsigned long __kernel_vsyscall;
+
+
+__init void scan_elf_aux( char **envp)
+{
+	long page_size = 0;
+	elf_auxv_t * auxv;
+
+	while ( *envp++ != NULL) ;
+
+	for ( auxv = (elf_auxv_t *)envp; auxv->a_type != AT_NULL; auxv++) {
+		switch ( auxv->a_type ) {
+			case AT_SYSINFO:
+				__kernel_vsyscall = auxv->a_un.a_val;
+				break;
+			case AT_SYSINFO_EHDR:
+				vsyscall_ehdr = auxv->a_un.a_val;
+				break;
+			case AT_HWCAP:
+				elf_aux_hwcap = auxv->a_un.a_val;
+				break;
+			case AT_PLATFORM:
+				elf_aux_platform = auxv->a_un.a_val;
+				break;
+			case AT_PAGESZ:
+				page_size = auxv->a_un.a_val;
+				break;
+		}
+	}
+	if ( ! __kernel_vsyscall || ! vsyscall_ehdr ||
+	     ! elf_aux_hwcap || ! elf_aux_platform ||
+	     ! page_size || (vsyscall_ehdr % page_size) ) {
+		__kernel_vsyscall = 0;
+		vsyscall_ehdr = 0;
+		elf_aux_hwcap = 0;
+		elf_aux_platform = "i586";
+	}
+	else {
+		vsyscall_end = vsyscall_ehdr + page_size;
+	}
+}
Index: linux-2.6.10/arch/um/os-Linux/user_syms.c
===================================================================
--- linux-2.6.10.orig/arch/um/os-Linux/user_syms.c	2004-12-25 05:35:23.000000000 +0800
+++ linux-2.6.10/arch/um/os-Linux/user_syms.c	2005-04-07 22:05:29.478760736 +0800
@@ -26,6 +26,9 @@
 
 EXPORT_SYMBOL(strstr);
 
+EXPORT_SYMBOL(vsyscall_ehdr);
+EXPORT_SYMBOL(vsyscall_end);
+
 /* Here, instead, I can provide a fake prototype. Yes, someone cares: genksyms.
  * However, the modules will use the CRC defined *here*, no matter if it is
  * good; so the versions of these symbols will always match
Index: linux-2.6.10/arch/um/os-Linux/Makefile
===================================================================
--- linux-2.6.10.orig/arch/um/os-Linux/Makefile	2004-12-25 05:35:00.000000000 +0800
+++ linux-2.6.10/arch/um/os-Linux/Makefile	2005-04-07 22:05:29.479760584 +0800
@@ -3,9 +3,9 @@
 # Licensed under the GPL
 #
 
-obj-y = file.o process.o time.o tty.o user_syms.o drivers/
+obj-y = elf_aux.o file.o process.o time.o tty.o user_syms.o drivers/
 
-USER_OBJS := $(foreach file,file.o process.o time.o tty.o,$(obj)/$(file))
+USER_OBJS := $(foreach file,elf_aux.o file.o process.o time.o tty.o,$(obj)/$(file))
 
 $(USER_OBJS) : %.o: %.c
 	$(CC) $(CFLAGS_$(notdir $@)) $(USER_CFLAGS) -c -o $@ $<
Index: linux-2.6.10/arch/um/sys-i386/signal.c
===================================================================
--- linux-2.6.10.orig/arch/um/sys-i386/signal.c	2005-04-07 19:34:21.197950744 +0800
+++ linux-2.6.10/arch/um/sys-i386/signal.c	2005-04-07 22:05:29.479760584 +0800
@@ -0,0 +1,374 @@
+/*
+ * Copyright (C) 2004 Jeff Dike ([e-mail])
+ * Licensed under the GPL
+ */
+
+#include "linux/signal.h"
+#include "linux/ptrace.h"
+#include "asm/current.h"
+#include "asm/ucontext.h"
+#include "asm/uaccess.h"
+#include "asm/unistd.h"
+#include "frame_kern.h"
+#include "signal_user.h"
+#include "ptrace_user.h"
+#include "sigcontext.h"
+#include "mode.h"
+
+#ifdef CONFIG_MODE_SKAS
+
+#include "skas.h"
+
+static int copy_sc_from_user_skas(struct pt_regs *regs,
+				  struct sigcontext *from)
+{
+  	struct sigcontext sc;
+	unsigned long fpregs[HOST_FP_SIZE];
+	int err;
+
+	err = copy_from_user(&sc, from, sizeof(sc));
+	err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs));
+	if(err)
+		return(err);
+
+	REGS_GS(regs->regs.skas.regs) = sc.gs;
+	REGS_FS(regs->regs.skas.regs) = sc.fs;
+	REGS_ES(regs->regs.skas.regs) = sc.es;
+	REGS_DS(regs->regs.skas.regs) = sc.ds;
+	REGS_EDI(regs->regs.skas.regs) = sc.edi;
+	REGS_ESI(regs->regs.skas.regs) = sc.esi;
+	REGS_EBP(regs->regs.skas.regs) = sc.ebp;
+	REGS_SP(regs->regs.skas.regs) = sc.esp;
+	REGS_EBX(regs->regs.skas.regs) = sc.ebx;
+	REGS_EDX(regs->regs.skas.regs) = sc.edx;
+	REGS_ECX(regs->regs.skas.regs) = sc.ecx;
+	REGS_EAX(regs->regs.skas.regs) = sc.eax;
+	REGS_IP(regs->regs.skas.regs) = sc.eip;
+	REGS_CS(regs->regs.skas.regs) = sc.cs;
+	REGS_EFLAGS(regs->regs.skas.regs) = sc.eflags;
+	REGS_SS(regs->regs.skas.regs) = sc.ss;
+	regs->regs.skas.fault_addr = sc.cr2;
+	regs->regs.skas.fault_type = FAULT_WRITE(sc.err);
+	regs->regs.skas.trap_type = sc.trapno;
+
+	err = ptrace_setfpregs(userspace_pid[0], fpregs);
+	if(err < 0){
+	  	printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, "
+		       "errno = %d\n", err);
+		return(1);
+	}
+
+	return(0);
+}
+
+int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
+			 struct pt_regs *regs, unsigned long fault_addr,
+			 int fault_type)
+{
+  	struct sigcontext sc;
+	unsigned long fpregs[HOST_FP_SIZE];
+	int err;
+
+	sc.gs = REGS_GS(regs->regs.skas.regs);
+	sc.fs = REGS_FS(regs->regs.skas.regs);
+	sc.es = REGS_ES(regs->regs.skas.regs);
+	sc.ds = REGS_DS(regs->regs.skas.regs);
+	sc.edi = REGS_EDI(regs->regs.skas.regs);
+	sc.esi = REGS_ESI(regs->regs.skas.regs);
+	sc.ebp = REGS_EBP(regs->regs.skas.regs);
+	sc.esp = REGS_SP(regs->regs.skas.regs);
+	sc.ebx = REGS_EBX(regs->regs.skas.regs);
+	sc.edx = REGS_EDX(regs->regs.skas.regs);
+	sc.ecx = REGS_ECX(regs->regs.skas.regs);
+	sc.eax = REGS_EAX(regs->regs.skas.regs);
+	sc.eip = REGS_IP(regs->regs.skas.regs);
+	sc.cs = REGS_CS(regs->regs.skas.regs);
+	sc.eflags = REGS_EFLAGS(regs->regs.skas.regs);
+	sc.esp_at_signal = regs->regs.skas.regs[UESP];
+	sc.ss = regs->regs.skas.regs[SS];
+	sc.cr2 = fault_addr;
+	sc.err = TO_SC_ERR(fault_type);
+	sc.trapno = regs->regs.skas.trap_type;
+
+	err = ptrace_getfpregs(userspace_pid[0], fpregs);
+	if(err < 0){
+	  	printk("copy_sc_to_user_skas - PTRACE_GETFPREGS failed, "
+		       "errno = %d\n", err);
+		return(1);
+	}
+	to_fp = (to_fp ? to_fp : (struct _fpstate *) (to + 1));
+	sc.fpstate = to_fp;
+
+	if(err)
+	  	return(err);
+
+	return(copy_to_user(to, &sc, sizeof(sc)) ||
+	       copy_to_user(to_fp, fpregs, sizeof(fpregs)));
+}
+#endif
+
+#ifdef CONFIG_MODE_TT
+int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
+			 int fpsize)
+{
+	struct _fpstate *to_fp, *from_fp;
+	unsigned long sigs;
+	int err;
+
+	to_fp = to->fpstate;
+	from_fp = from->fpstate;
+	sigs = to->oldmask;
+	err = copy_from_user(to, from, sizeof(*to));
+	to->oldmask = sigs;
+	if(to_fp != NULL){
+		err |= copy_from_user(&to->fpstate, &to_fp,
+				      sizeof(to->fpstate));
+		err |= copy_from_user(to_fp, from_fp, fpsize);
+	}
+	return(err);
+}
+
+int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
+		       struct sigcontext *from, int fpsize)
+{
+	struct _fpstate *to_fp, *from_fp;
+	int err;
+
+	to_fp =	(fp ? fp : (struct _fpstate *) (to + 1));
+	from_fp = from->fpstate;
+	err = copy_to_user(to, from, sizeof(*to));
+	if(from_fp != NULL){
+		err |= copy_to_user(&to->fpstate, &to_fp,
+					 sizeof(to->fpstate));
+		err |= copy_to_user(to_fp, from_fp, fpsize);
+	}
+	return(err);
+}
+#endif
+
+static int copy_sc_from_user(struct pt_regs *to, void *from)
+{
+	int ret;
+
+	ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
+					       sizeof(struct _fpstate)),
+			  copy_sc_from_user_skas(to, from));
+	return(ret);
+}
+
+static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
+			   struct pt_regs *from)
+{
+	return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
+					      sizeof(*fp)),
+			   copy_sc_to_user_skas(to, fp, from,
+						current->thread.cr2,
+						current->thread.err)));
+}
+
+static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
+				 sigset_t *set, unsigned long sp)
+{
+	int err = 0;
+
+	err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
+	err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
+	err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
+	err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs);
+	err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
+	return(err);
+}
+
+struct sigframe
+{
+	char *pretcode;
+	int sig;
+	struct sigcontext sc;
+	struct _fpstate fpstate;
+	unsigned long extramask[_NSIG_WORDS-1];
+	char retcode[8];
+};
+
+struct rt_sigframe
+{
+	char *pretcode;
+	int sig;
+	struct siginfo *pinfo;
+	void *puc;
+	struct siginfo info;
+	struct ucontext uc;
+	struct _fpstate fpstate;
+	char retcode[8];
+};
+
+int setup_signal_stack_sc(unsigned long stack_top, int sig,
+			  struct k_sigaction *ka, struct pt_regs *regs,
+			  sigset_t *mask)
+{
+	struct sigframe __user *frame;
+	void *restorer;
+	int err = 0;
+
+	stack_top &= -8UL;
+	frame = (struct sigframe *) stack_top - 1;
+	if(verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
+		return(1);
+
+	restorer = (void *) frame->retcode;
+	if(ka->sa.sa_flags & SA_RESTORER)
+		restorer = ka->sa.sa_restorer;
+
+	err |= __put_user(restorer, &frame->pretcode);
+	err |= __put_user(sig, &frame->sig);
+	err |= copy_sc_to_user(&frame->sc, NULL, regs);
+	err |= __put_user(mask->sig[0], &frame->sc.oldmask);
+	if (_NSIG_WORDS > 1)
+		err |= __copy_to_user(&frame->extramask, &mask->sig[1],
+				      sizeof(frame->extramask));
+
+	/*
+	 * This is popl %eax ; movl $,%eax ; int $0x80
+	 *
+	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
+	 * reasons and because gdb uses it as a signature to notice
+	 * signal handler stack frames.
+	 */
+	err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
+	err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
+	err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
+
+	if(err)
+		return(err);
+
+	PT_REGS_SP(regs) = (unsigned long) frame;
+	PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
+	PT_REGS_EAX(regs) = (unsigned long) sig;
+	PT_REGS_EDX(regs) = (unsigned long) 0;
+	PT_REGS_ECX(regs) = (unsigned long) 0;
+
+	if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
+		ptrace_notify(SIGTRAP);
+	return(0);
+}
+
+int setup_signal_stack_si(unsigned long stack_top, int sig,
+			  struct k_sigaction *ka, struct pt_regs *regs,
+			  siginfo_t *info, sigset_t *mask)
+{
+	struct rt_sigframe __user *frame;
+	void *restorer;
+	int err = 0;
+
+	stack_top &= -8UL;
+	frame = (struct rt_sigframe *) stack_top - 1;
+	if(verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
+		return(1);
+
+	restorer = (void *) frame->retcode;
+	if(ka->sa.sa_flags & SA_RESTORER)
+		restorer = ka->sa.sa_restorer;
+
+	err |= __put_user(restorer, &frame->pretcode);
+	err |= __put_user(sig, &frame->sig);
+	err |= __put_user(&frame->info, &frame->pinfo);
+	err |= __put_user(&frame->uc, &frame->puc);
+	err |= copy_siginfo_to_user(&frame->info, info);
+	err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
+				     PT_REGS_SP(regs));
+
+	/*
+	 * This is movl $,%eax ; int $0x80
+	 *
+	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
+	 * reasons and because gdb uses it as a signature to notice