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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	Ptrace Vulnerability Allows Gaining of Elevated Privileges under Linux 19 Mar. 2003    Summary The Linux 2.2 and Linux 2.4 kernels have a flaw in ptrace. This hole allows local users to obtain full privileges. Remote exploitation of this hole is not possible. Linux 2.5 is not believed to be vulnerable.   Credit: The information has been provided by Alan Cox. Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Linux 2.2.25 has been released to correct Linux 2.2. It contains no other changes. The bug fixes that would have been in 2.2.5pre1 will now appear in 2.2.26pre1. The patch will apply directly to older 2.2 releases. A patch for Linux 2.4.20/Linux 2.4.21pre is attached. The patch also subtly changes the PR_SET_DUMPABLE prctl. We believe this is necessary and that it will not affect any software. The functionality change is specific to unusual debugging situations. Alan Cox would like to thank Andrzej Szombierski who found the problem, and wrote an initial patch. Seth Arnold cleaned up the 2.2 change. Arjan van de Ven and Ben LaHaise identified additional problems with the original fix. Patch: (also available from: http://www.uwsg.iu.edu/hypermail/linux/kernel/0303.2/0226.html) diff -purN linux.orig/arch/alpha/kernel/entry.S linux/arch/alpha/kernel/entry.S --- linux.orig/arch/alpha/kernel/entry.S Thu Mar 13 12:01:46 2003 +++ linux/arch/alpha/kernel/entry.S Thu Mar 13 13:28:49 2003 @@ -231,12 +231,12 @@ kernel_clone:  .end kernel_clone    /* - * kernel_thread(fn, arg, clone_flags) + * arch_kernel_thread(fn, arg, clone_flags)  */  .align 3  .globl kernel_thread  .ent kernel_thread -kernel_thread: +arch_kernel_thread:     ldgp $29,0($27) /* we can be called from a module */     .frame $30, 4*8, $26     subq $30,4*8,$30 diff -purN linux.orig/arch/arm/kernel/process.c linux/arch/arm/kernel/process.c --- linux.orig/arch/arm/kernel/process.c Thu Mar 13 12:01:29 2003 +++ linux/arch/arm/kernel/process.c Thu Mar 13 13:25:56 2003 @@ -366,7 +366,7 @@ void dump_thread(struct pt_regs * regs,  * a system call from a "real" process, but the process memory space will  * not be free'd until both the parent and the child have exited.  */ -pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +pid_t arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)  {     pid_t __ret;   diff -purN linux.orig/arch/cris/kernel/entry.S linux/arch/cris/kernel/entry.S --- linux.orig/arch/cris/kernel/entry.S Thu Mar 13 12:01:29 2003 +++ linux/arch/cris/kernel/entry.S Thu Mar 13 13:30:30 2003 @@ -736,12 +736,12 @@ hw_bp_trig_ptr:  * the grosser the code, at least with the gcc version in cris-dist-1.13.  */   -/* int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) */ +/* int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) */  /* r10 r11 r12 */       .text - .global kernel_thread -kernel_thread: + .global arch_kernel_thread +arch_kernel_thread:       /* Save ARG for later. */     move.d $r11, $r13 diff -purN linux.orig/arch/i386/kernel/process.c linux/arch/i386/kernel/process.c --- linux.orig/arch/i386/kernel/process.c Thu Mar 13 12:01:57 2003 +++ linux/arch/i386/kernel/process.c Thu Mar 13 13:26:08 2003 @@ -495,7 +495,7 @@ void release_segments(struct mm_struct *  /*  * Create a kernel thread  */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     long retval, d0;   @@ -518,6 +518,7 @@ int kernel_thread(int (*fn)(void *), voi       "r" (arg), "r" (fn),       "b" (flags | CLONE_VM)       : "memory"); +     return retval;  }   diff -purN linux.orig/arch/ia64/kernel/process.c linux/arch/ia64/kernel/process.c --- linux.orig/arch/ia64/kernel/process.c Thu Mar 13 12:01:29 2003 +++ linux/arch/ia64/kernel/process.c Thu Mar 13 13:26:15 2003 @@ -220,7 +220,7 @@ ia64_load_extra (struct task_struct *tas  * | | <-- sp (lowest addr)  * +---------------------+  * - * Note: if we get called through kernel_thread() then the memory + * Note: if we get called through arch_kernel_thread() then the memory  * above "(highest addr)" is valid kernel stack memory that needs to  * be copied as well.  * @@ -469,7 +469,7 @@ ia64_set_personality (struct elf64_hdr *  }    pid_t -kernel_thread (int (*fn)(void *), void *arg, unsigned long flags) +arch_kernel_thread (int (*fn)(void *), void *arg, unsigned long flags)  {     struct task_struct *parent = current;     int result, tid; diff -purN linux.orig/arch/m68k/kernel/process.c linux/arch/m68k/kernel/process.c --- linux.orig/arch/m68k/kernel/process.c Thu Mar 13 12:01:29 2003 +++ linux/arch/m68k/kernel/process.c Thu Mar 13 13:26:18 2003 @@ -124,7 +124,7 @@ void show_regs(struct pt_regs * regs)  /*  * Create a kernel thread  */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     int pid;     mm_segment_t fs; diff -purN linux.orig/arch/mips/kernel/process.c linux/arch/mips/kernel/process.c --- linux.orig/arch/mips/kernel/process.c Thu Mar 13 12:01:29 2003 +++ linux/arch/mips/kernel/process.c Thu Mar 13 13:26:28 2003 @@ -155,7 +155,7 @@ void dump_thread(struct pt_regs *regs, s  /*  * Create a kernel thread  */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     long retval;   diff -purN linux.orig/arch/mips64/kernel/process.c linux/arch/mips64/kernel/process.c --- linux.orig/arch/mips64/kernel/process.c Thu Mar 13 12:01:29 2003 +++ linux/arch/mips64/kernel/process.c Thu Mar 13 13:26:23 2003 @@ -152,7 +152,7 @@ void dump_thread(struct pt_regs *regs, s  /*  * Create a kernel thread  */ -int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)  {     int retval;   diff -purN linux.orig/arch/parisc/kernel/process.c linux/arch/parisc/kernel/process.c --- linux.orig/arch/parisc/kernel/process.c Fri Feb 9 14:29:44 2001 +++ linux/arch/parisc/kernel/process.c Thu Mar 13 13:26:36 2003 @@ -118,7 +118,7 @@ void machine_heartbeat(void)  */    extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); -pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +pid_t arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)  {       /* diff -purN linux.orig/arch/ppc/kernel/misc.S linux/arch/ppc/kernel/misc.S --- linux.orig/arch/ppc/kernel/misc.S Thu Mar 13 12:01:29 2003 +++ linux/arch/ppc/kernel/misc.S Thu Mar 13 13:32:21 2003 @@ -899,9 +899,9 @@ _GLOBAL(cvt_df)    /*  * Create a kernel thread - * kernel_thread(fn, arg, flags) + * arch_kernel_thread(fn, arg, flags)  */ -_GLOBAL(kernel_thread) +_GLOBAL(arch_kernel_thread)     mr r6,r3 /* function */     ori r3,r5,CLONE_VM /* flags */     li r0,__NR_clone diff -purN linux.orig/arch/ppc64/kernel/misc.S linux/arch/ppc64/kernel/misc.S --- linux.orig/arch/ppc64/kernel/misc.S Thu Mar 13 12:01:30 2003 +++ linux/arch/ppc64/kernel/misc.S Thu Mar 13 13:29:42 2003 @@ -493,9 +493,9 @@ _GLOBAL(cvt_df)    /*  * Create a kernel thread - * kernel_thread(fn, arg, flags) + * arch_kernel_thread(fn, arg, flags)  */ -_GLOBAL(kernel_thread) +_GLOBAL(arch_kernel_thread)     mr r6,r3 /* function */     ori r3,r5,CLONE_VM /* flags */     li r0,__NR_clone diff -purN linux.orig/arch/s390/kernel/process.c linux/arch/s390/kernel/process.c --- linux.orig/arch/s390/kernel/process.c Thu Mar 13 12:01:30 2003 +++ linux/arch/s390/kernel/process.c Thu Mar 13 13:26:43 2003 @@ -105,7 +105,7 @@ void show_regs(struct pt_regs *regs)       show_trace((unsigned long *) regs->gprs[15]);  }   -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     int clone_arg = flags | CLONE_VM;     int retval; diff -purN linux.orig/arch/s390x/kernel/process.c linux/arch/s390x/kernel/process.c --- linux.orig/arch/s390x/kernel/process.c Thu Mar 13 12:01:30 2003 +++ linux/arch/s390x/kernel/process.c Thu Mar 13 13:26:46 2003 @@ -102,7 +102,7 @@ void show_regs(struct pt_regs *regs)       show_trace((unsigned long *) regs->gprs[15]);  }   -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     int clone_arg = flags | CLONE_VM;     int retval; diff -purN linux.orig/arch/sh/kernel/process.c linux/arch/sh/kernel/process.c --- linux.orig/arch/sh/kernel/process.c Mon Oct 15 16:36:48 2001 +++ linux/arch/sh/kernel/process.c Thu Mar 13 13:26:49 2003 @@ -118,7 +118,7 @@ void free_task_struct(struct task_struct  * This is the mechanism for creating a new kernel thread.  *  */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  { /* Don't use this in BL=1(cli). Or else, CPU resets! */     register unsigned long __sc0 __asm__ ("r0");     register unsigned long __sc3 __asm__ ("r3") = __NR_clone; diff -purN linux.orig/arch/sparc/kernel/process.c linux/arch/sparc/kernel/process.c --- linux.orig/arch/sparc/kernel/process.c Thu Mar 13 12:01:30 2003 +++ linux/arch/sparc/kernel/process.c Thu Mar 13 13:26:58 2003 @@ -676,7 +676,7 @@ out:  * a system call from a "real" process, but the process memory space will  * not be free'd until both the parent and the child have exited.  */ -pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     long retval;   diff -purN linux.orig/arch/sparc64/kernel/process.c linux/arch/sparc64/kernel/process.c --- linux.orig/arch/sparc64/kernel/process.c Thu Mar 13 12:01:30 2003 +++ linux/arch/sparc64/kernel/process.c Thu Mar 13 13:26:54 2003 @@ -658,7 +658,7 @@ int copy_thread(int nr, unsigned long cl  * a system call from a "real" process, but the process memory space will  * not be free'd until both the parent and the child have exited.  */ -pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     long retval;   diff -purN linux.orig/arch/um/kernel/process_kern.c linux/arch/um/kernel/process_kern.c --- linux.orig/arch/um/kernel/process_kern.c Thu Mar 13 12:01:48 2003 +++ linux/arch/um/kernel/process_kern.c Thu Mar 13 13:27:37 2003 @@ -171,14 +171,14 @@ static int new_thread_proc(void *stack)     os_usr1_process(os_getpid());  }   -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)  {     int pid;       current->thread.request.u.thread.proc = fn;     current->thread.request.u.thread.arg = arg;     pid = do_fork(CLONE_VM | flags, 0, NULL, 0); - if(pid < 0) panic("do_fork failed in kernel_thread"); + if(pid < 0) panic("do_fork failed in arch_kernel_thread");     return(pid);  }   diff -purN linux.orig/fs/exec.c linux/fs/exec.c --- linux.orig/fs/exec.c Thu Mar 13 12:01:46 2003 +++ linux/fs/exec.c Thu Mar 13 14:19:08 2003 @@ -559,8 +559,10 @@ int flush_old_exec(struct linux_binprm *       current->sas_ss_sp = current->sas_ss_size = 0;   - if (current->euid == current->uid && current->egid == current->gid) + if (current->euid == current->uid && current->egid == current->gid) {       current->mm->dumpable = 1; + current->task_dumpable = 1; + }     name = bprm->filename;     for (i=0; (ch = *(name++)) != '\0';) {       if (ch == '/') @@ -952,7 +954,7 @@ int do_coredump(long signr, struct pt_re     binfmt = current->binfmt;     if (!binfmt || !binfmt->core_dump)       goto fail; - if (!current->mm->dumpable) + if (!is_dumpable(current))       goto fail;     current->mm->dumpable = 0;     if (current->rlim[RLIMIT_CORE].rlim_cur < binfmt->min_coredump) diff -purN linux.orig/include/asm-alpha/processor.h linux/include/asm-alpha/processor.h --- linux.orig/include/asm-alpha/processor.h Fri Oct 5 15:11:05 2001 +++ linux/include/asm-alpha/processor.h Thu Mar 13 13:35:18 2003 @@ -119,7 +119,7 @@ struct task_struct;  extern void release_thread(struct task_struct *);    /* Create a kernel thread without removing it from tasklists. */ -extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); +extern long arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);    #define copy_segments(tsk, mm) do { } while (0)  #define release_segments(mm) do { } while (0) diff -purN linux.orig/include/asm-arm/processor.h linux/include/asm-arm/processor.h --- linux.orig/include/asm-arm/processor.h Thu Mar 13 12:01:35 2003 +++ linux/include/asm-arm/processor.h Thu Mar 13 13:35:18 2003 @@ -117,7 +117,7 @@ extern void __free_task_struct(struct ta  /*  * Create a new kernel thread  */ -extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);    #endif   diff -purN linux.orig/include/asm-cris/processor.h linux/include/asm-cris/processor.h --- linux.orig/include/asm-cris/processor.h Thu Mar 13 12:01:35 2003 +++ linux/include/asm-cris/processor.h Thu Mar 13 13:35:18 2003 @@ -81,7 +81,7 @@ struct thread_struct {  #define INIT_THREAD { \   0, 0, 0x20 } /* ccr = int enable, nothing else */   -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* give the thread a program location  * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8) diff -purN linux.orig/include/asm-i386/processor.h linux/include/asm-i386/processor.h --- linux.orig/include/asm-i386/processor.h Thu Mar 13 12:01:57 2003 +++ linux/include/asm-i386/processor.h Thu Mar 13 13:51:02 2003 @@ -433,7 +433,7 @@ extern void release_thread(struct task_s  /*  * create a kernel thread without removing it from tasklists  */ -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  extern void copy_segments(struct task_struct *p, struct mm_struct * mm); diff -purN linux.orig/include/asm-ia64/processor.h linux/include/asm-ia64/processor.h --- linux.orig/include/asm-ia64/processor.h Thu Mar 13 12:01:35 2003 +++ linux/include/asm-ia64/processor.h Thu Mar 13 13:35:18 2003 @@ -476,7 +476,7 @@ struct task_struct;  * do_basic_setup() and the timing is such that free_initmem() has  * been called already.  */ -extern int kernel_thread (int (*fn)(void *), void *arg, unsigned long flags); +extern int arch_kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  #define copy_segments(tsk, mm) do { } while (0) diff -purN linux.orig/include/asm-m68k/processor.h linux/include/asm-m68k/processor.h --- linux.orig/include/asm-m68k/processor.h Fri Oct 5 15:11:05 2001 +++ linux/include/asm-m68k/processor.h Thu Mar 13 13:35:18 2003 @@ -105,7 +105,7 @@ static inline void release_thread(struct  {  }   -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    #define copy_segments(tsk, mm) do { } while (0)  #define release_segments(mm) do { } while (0) diff -purN linux.orig/include/asm-mips/processor.h linux/include/asm-mips/processor.h --- linux.orig/include/asm-mips/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-mips/processor.h Thu Mar 13 13:35:18 2003 @@ -186,7 +186,7 @@ struct thread_struct {  /* Free all resources held by a thread. */  #define release_thread(thread) do { } while(0)   -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  #define copy_segments(p, mm) do { } while(0) diff -purN linux.orig/include/asm-mips64/processor.h linux/include/asm-mips64/processor.h --- linux.orig/include/asm-mips64/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-mips64/processor.h Thu Mar 13 13:35:18 2003 @@ -245,7 +245,7 @@ struct thread_struct {  /* Free all resources held by a thread. */  #define release_thread(thread) do { } while(0)   -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  #define copy_segments(p, mm) do { } while(0) diff -purN linux.orig/include/asm-parisc/processor.h linux/include/asm-parisc/processor.h --- linux.orig/include/asm-parisc/processor.h Fri Oct 5 15:11:05 2001 +++ linux/include/asm-parisc/processor.h Thu Mar 13 13:35:18 2003 @@ -305,7 +305,7 @@ struct task_struct;    /* Free all resources held by a thread. */  extern void release_thread(struct task_struct *); -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    #define copy_segments(tsk, mm) do { } while (0)  #define release_segments(mm) do { } while (0) diff -purN linux.orig/include/asm-ppc/processor.h linux/include/asm-ppc/processor.h --- linux.orig/include/asm-ppc/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-ppc/processor.h Thu Mar 13 13:35:18 2003 @@ -593,7 +593,7 @@ void release_thread(struct task_struct *  /*  * Create a new kernel thread.  */ -extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); +extern long arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);    /*  * Bus types diff -purN linux.orig/include/asm-ppc64/processor.h linux/include/asm-ppc64/processor.h --- linux.orig/include/asm-ppc64/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-ppc64/processor.h Thu Mar 13 13:35:18 2003 @@ -609,7 +609,7 @@ void release_thread(struct task_struct *  /*  * Create a new kernel thread.  */ -extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); +extern long arch_kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);    /*  * Bus types diff -purN linux.orig/include/asm-s390/processor.h linux/include/asm-s390/processor.h --- linux.orig/include/asm-s390/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-s390/processor.h Thu Mar 13 13:35:18 2003 @@ -113,7 +113,7 @@ struct mm_struct;    /* Free all resources held by a thread. */  extern void release_thread(struct task_struct *); -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  #define copy_segments(nr, mm) do { } while (0) diff -purN linux.orig/include/asm-s390x/processor.h linux/include/asm-s390x/processor.h --- linux.orig/include/asm-s390x/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-s390x/processor.h Thu Mar 13 13:35:18 2003 @@ -127,7 +127,7 @@ struct mm_struct;    /* Free all resources held by a thread. */  extern void release_thread(struct task_struct *); -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /* Copy and release all segment info associated with a VM */  #define copy_segments(nr, mm) do { } while (0) diff -purN linux.orig/include/asm-sh/processor.h linux/include/asm-sh/processor.h --- linux.orig/include/asm-sh/processor.h Fri Oct 5 15:11:05 2001 +++ linux/include/asm-sh/processor.h Thu Mar 13 13:35:18 2003 @@ -137,7 +137,7 @@ extern void release_thread(struct task_s  /*  * create a kernel thread without removing it from tasklists  */ -extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    /*  * Bus types diff -purN linux.orig/include/asm-sparc/processor.h linux/include/asm-sparc/processor.h --- linux.orig/include/asm-sparc/processor.h Thu Oct 11 02:42:47 2001 +++ linux/include/asm-sparc/processor.h Thu Mar 13 13:35:18 2003 @@ -146,7 +146,7 @@ extern __inline__ void start_thread(stru    /* Free all resources held by a thread. */  #define release_thread(tsk) do { } while(0) -extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);      #define copy_segments(tsk, mm) do { } while (0) diff -purN linux.orig/include/asm-sparc64/processor.h linux/include/asm-sparc64/processor.h --- linux.orig/include/asm-sparc64/processor.h Thu Mar 13 12:01:36 2003 +++ linux/include/asm-sparc64/processor.h Thu Mar 13 13:35:18 2003 @@ -270,7 +270,7 @@ do { \  /* Free all resources held by a thread. */  #define release_thread(tsk) do { } while(0)   -extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +extern pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);    #define copy_segments(tsk, mm) do { } while (0)  #define release_segments(mm) do { } while (0) diff -purN linux.orig/include/linux/sched.h linux/include/linux/sched.h --- linux.orig/include/linux/sched.h Thu Mar 13 12:01:57 2003 +++ linux/include/linux/sched.h Thu Mar 13 13:54:05 2003 @@ -362,6 +362,7 @@ struct task_struct {     /* ??? */     unsigned long personality;     int did_exec:1; + unsigned task_dumpable:1;     pid_t pid;     pid_t pgrp;     pid_t tty_old_pgrp; @@ -485,6 +486,8 @@ struct task_struct {  #define PT_TRACESYSGOOD 0x00000008  #define PT_PTRACE_CAP 0x00000010 /* ptracer can follow suid-exec */   +#define is_dumpable(tsk) ((tsk)->task_dumpable && (tsk)->mm->dumpable) +  /*  * Limit the stack by to some sane default: root can always  * increase this limit if needed.. 8MB seems reasonable. @@ -848,6 +851,8 @@ extern void FASTCALL(remove_wait_queue(w    extern void wait_task_inactive(task_t * p);  extern void kick_if_running(task_t * p); +extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +    #define __wait_event(wq, condition) \  do { \ diff -purN linux.orig/kernel/fork.c linux/kernel/fork.c --- linux.orig/kernel/fork.c Thu Mar 13 12:01:57 2003 +++ linux/kernel/fork.c Thu Mar 13 13:51:24 2003 @@ -28,6 +28,7 @@  #include <asm/pgalloc.h>  #include <asm/uaccess.h>  #include <asm/mmu_context.h> +#include <asm/processor.h>    /* The idle threads do not count.. */  int nr_threads; @@ -575,6 +576,31 @@ static inline void copy_flags(unsigned l     p->flags = new_flags;  }   +long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +{ + struct task_struct *task = current; + unsigned old_task_dumpable; + long ret; + + /* lock out any potential ptracer */ + task_lock(task); + if (task->ptrace) { + task_unlock(task); + return -EPERM; + } + + old_task_dumpable = task->task_dumpable; + task->task_dumpable = 0; + task_unlock(task); + + ret = arch_kernel_thread(fn, arg, flags); + + /* never reached in child process, only in parent */ + current->task_dumpable = old_task_dumpable; + + return ret; +} +  /*  * Ok, this is the main fork-routine. It copies the system process  * information (task[nr]) and sets up the necessary registers. It also diff -purN linux.orig/kernel/ptrace.c linux/kernel/ptrace.c --- linux.orig/kernel/ptrace.c Thu Mar 13 12:01:46 2003 +++ linux/kernel/ptrace.c Thu Mar 13 13:47:16 2003 @@ -21,6 +21,10 @@  */  int ptrace_check_attach(struct task_struct *child, int kill)  { + mb(); + if (!is_dumpable(child)) + return -EPERM; +     if (!(child->ptrace & PT_PTRACED))       return -ESRCH;   @@ -57,7 +61,7 @@ int ptrace_attach(struct task_struct *ta      (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))       goto bad;     rmb(); - if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE)) + if (!is_dumpable(task) && !capable(CAP_SYS_PTRACE))       goto bad;     /* the same process cannot be attached many times */     if (task->ptrace & PT_PTRACED) @@ -123,6 +127,8 @@ int access_process_vm(struct task_struct     /* Worry about races with exit() */     task_lock(tsk);     mm = tsk->mm; + if (!is_dumpable(tsk) || (&init_mm == mm)) + mm = NULL;     if (mm)       atomic_inc(&mm->mm_users);     task_unlock(tsk); diff -purN linux.orig/kernel/sys.c linux/kernel/sys.c --- linux.orig/kernel/sys.c Thu Mar 13 12:01:57 2003 +++ linux/kernel/sys.c Thu Mar 13 13:41:25 2003 @@ -1286,7 +1286,7 @@ asmlinkage long sys_prctl(int option, un          error = put_user(current->pdeath_signal, (int *)arg2);          break;       case PR_GET_DUMPABLE: - if (current->mm->dumpable) + if (is_dumpable(current))             error = 1;          break;       case PR_SET_DUMPABLE: @@ -1294,7 +1294,8 @@ asmlinkage long sys_prctl(int option, un             error = -EINVAL;             break;          } - current->mm->dumpable = arg2; + if (is_dumpable(current)) + current->mm->dumpable = arg2;          break;       case PR_SET_UNALIGN:  #ifdef SET_UNALIGN_CTL  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability Insight Control for Linux Multiple Vulnerabilities HP-UX Running NFS/ONCplus Denial of Service Vulnerability HP-UX Running BIND Denial of Service Vulnerability 2011 HP-UX Running XNTP Denial of Service Vulnerability HP-UX Denial of Service Vulnerability Webkit Detached Body Element Code Execution Vulnerability Mac OS X Compact Font Format Decoder Code Execution Vulnerability WebKit WBR Tag Removal Code Execution Vulnerability Webkit Undefined DOM Prototype Attach Code Execution Vulnerability Apple HFS Information Disclosure Vulnerability XPDF arbitrary Arbitrary Code Execution Vulnerabilities Hewlett-Packard Data Protector Client EXEC_CMD omni_chk_ds.sh Code Execution Vulnerability Red Hat OpenJDK IcedTea6 ClassLoader Code Execution Vulnerability HP-UX Apache Running Tomcat Servlet Engine Remote Modification and Denial of Service Vulnerabilities  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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