xnu-2782.20.48.tar.gz

[apple/xnu.git] / bsd / kern / kern_core.c

diff --git a/bsd/kern/kern_core.c b/bsd/kern/kern_core.c
index 90d9ad7bfabd7c9728ecc822d13b185e73c60b8e..2bd9de059d460bb414c7a13b14082d4afec284f3 100644 (file)
--- a/bsd/kern/kern_core.c
+++ b/bsd/kern/kern_core.c
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -63,34 +63,20 @@
 #include <mach/task.h>         /* task_suspend() */
 #include <kern/task.h>         /* get_task_numacts() */
 
 #include <mach/task.h>         /* task_suspend() */
 #include <kern/task.h>         /* get_task_numacts() */
 

+#include <security/audit/audit.h>
+

 typedef struct {
        int     flavor;                 /* the number for this flavor */
 typedef struct {
        int     flavor;                 /* the number for this flavor */

-       int     count;                  /* count of ints in this flavor */
+       mach_msg_type_number_t  count;  /* count of ints in this flavor */

 } mythread_state_flavor_t;
 
 } mythread_state_flavor_t;
 

-#if defined (__ppc__)
-
-mythread_state_flavor_t thread_flavor_array[]={
-               {PPC_THREAD_STATE , PPC_THREAD_STATE_COUNT},
-               {PPC_FLOAT_STATE, PPC_FLOAT_STATE_COUNT}, 
-               {PPC_EXCEPTION_STATE, PPC_EXCEPTION_STATE_COUNT},
-               {PPC_VECTOR_STATE, PPC_VECTOR_STATE_COUNT}
-               };
-int mynum_flavors=4;
-#elif defined (__i386__)
+#if defined (__i386__) || defined (__x86_64__)

 mythread_state_flavor_t thread_flavor_array [] = { 
 mythread_state_flavor_t thread_flavor_array [] = { 

-               {i386_THREAD_STATE, i386_THREAD_STATE_COUNT},
-               {i386_THREAD_FPSTATE, i386_THREAD_FPSTATE_COUNT},
-               {i386_THREAD_EXCEPTSTATE, i386_THREAD_EXCEPTSTATE_COUNT},
-               {i386_THREAD_CTHREADSTATE, i386_THREAD_CTHREADSTATE_COUNT},
-               {i386_NEW_THREAD_STATE, i386_NEW_THREAD_STATE_COUNT},
-               {i386_FLOAT_STATE, i386_FLOAT_STATE_COUNT},
-               {i386_ISA_PORT_MAP_STATE, i386_ISA_PORT_MAP_STATE_COUNT},
-               {i386_V86_ASSIST_STATE, i386_V86_ASSIST_STATE_COUNT},
-               {THREAD_SYSCALL_STATE, i386_THREAD_SYSCALL_STATE_COUNT}
+               {x86_THREAD_STATE, x86_THREAD_STATE_COUNT},
+               {x86_FLOAT_STATE, x86_FLOAT_STATE_COUNT},
+               {x86_EXCEPTION_STATE, x86_EXCEPTION_STATE_COUNT},

                };
                };

-int mynum_flavors=9;
-
+int mynum_flavors=3;

 #else
 #error architecture not supported
 #endif
 #else
 #error architecture not supported
 #endif


@@ -101,19 +87,61 @@ typedef struct {
        int  hoffset;
        mythread_state_flavor_t *flavors;
        int tstate_size;
        int  hoffset;
        mythread_state_flavor_t *flavors;
        int tstate_size;

+       int flavor_count;

 } tir_t;
 
 /* XXX should be static */
 void collectth_state(thread_t th_act, void *tirp);
 
 } tir_t;
 
 /* XXX should be static */
 void collectth_state(thread_t th_act, void *tirp);
 

+extern int freespace_mb(vnode_t vp);
+

 /* XXX not in a Mach header anywhere */
 kern_return_t thread_getstatus(register thread_t act, int flavor,
        thread_state_t tstate, mach_msg_type_number_t *count);
 void task_act_iterate_wth_args(task_t, void(*)(thread_t, void *), void *);
 /* XXX not in a Mach header anywhere */
 kern_return_t thread_getstatus(register thread_t act, int flavor,
        thread_state_t tstate, mach_msg_type_number_t *count);
 void task_act_iterate_wth_args(task_t, void(*)(thread_t, void *), void *);

+extern kern_return_t task_suspend_internal(task_t);
+
+static cpu_type_t process_cpu_type(proc_t proc);
+static cpu_type_t process_cpu_subtype(proc_t proc);
+
+#ifdef SECURE_KERNEL
+__XNU_PRIVATE_EXTERN int do_coredump = 0;      /* default: don't dump cores */
+#else
+__XNU_PRIVATE_EXTERN int do_coredump = 1;      /* default: dump cores */
+#endif
+__XNU_PRIVATE_EXTERN int sugid_coredump = 0; /* default: but not SGUID binaries */
+
+
+/* cpu_type returns only the most generic indication of the current CPU. */
+/* in a core we want to know the kind of process. */

 
 

+static cpu_type_t
+process_cpu_type(proc_t core_proc)
+{
+       cpu_type_t what_we_think;
+#if defined (__i386__) || defined (__x86_64__)
+    if (IS_64BIT_PROCESS(core_proc)) {
+               what_we_think = CPU_TYPE_X86_64;
+       } else {
+               what_we_think = CPU_TYPE_I386;
+       }
+#endif
+       return what_we_think;
+}

 
 

-__private_extern__ int do_coredump = 1;        /* default: dump cores */
-__private_extern__ int sugid_coredump = 0; /* default: but not SGUID binaries */
+static cpu_type_t
+process_cpu_subtype(proc_t core_proc)
+{
+       cpu_type_t what_we_think;
+#if defined (__i386__) || defined (__x86_64__)
+    if (IS_64BIT_PROCESS(core_proc)) {
+               what_we_think = CPU_SUBTYPE_X86_64_ALL;
+       } else {
+               what_we_think = CPU_SUBTYPE_I386_ALL;
+       }
+#endif
+       return what_we_think;
+}

 
 void
 collectth_state(thread_t th_act, void *tirp)
 
 void
 collectth_state(thread_t th_act, void *tirp)


@@ -141,7 +169,7 @@ collectth_state(thread_t th_act, void *tirp)
                 * the appropriate thread state struct for each
                 * thread state flavor.
                 */
                 * the appropriate thread state struct for each
                 * thread state flavor.
                 */

-               for (i = 0; i < mynum_flavors; i++) {
+               for (i = 0; i < t->flavor_count; i++) {

                        *(mythread_state_flavor_t *)(header+hoffset) =
                          flavors[i];
                        hoffset += sizeof(mythread_state_flavor_t);
                        *(mythread_state_flavor_t *)(header+hoffset) =
                          flavors[i];
                        hoffset += sizeof(mythread_state_flavor_t);


@@ -154,96 +182,128 @@ collectth_state(thread_t th_act, void *tirp)
                t->hoffset = hoffset;
 }
 
                t->hoffset = hoffset;
 }
 

+

 /*
 /*

- * Create a core image on the file "core".
+ * coredump
+ *
+ * Description:        Create a core image on the file "core" for the process
+ *             indicated
+ *
+ * Parameters: core_proc                       Process to dump core [*]
+ *                             reserve_mb                      If non-zero, leave filesystem with
+ *                                                                     at least this much free space.
+ *                             ignore_ulimit           If set, ignore the process's core file ulimit.  
+ *
+ * Returns:    0                               Success
+ *             EFAULT                          Failed
+ *
+ * IMPORTANT:  This function can only be called on the current process, due
+ *             to assumptions below; see variable declaration section for
+ *             details.

  */
 #define        MAX_TSTATE_FLAVORS      10
 int
  */
 #define        MAX_TSTATE_FLAVORS      10
 int

-coredump(struct proc *p)
+coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit)

 {
 {

-       int error=0;
-       kauth_cred_t cred = kauth_cred_get();
+/* Begin assumptions that limit us to only the current process */
+       vfs_context_t ctx = vfs_context_current();
+       vm_map_t        map = current_map();
+       task_t          task = current_task();
+/* End assumptions */
+       kauth_cred_t cred = vfs_context_ucred(ctx);
+       int error = 0;

        struct vnode_attr va;
        struct vnode_attr va;

-       struct vfs_context context;
-       vm_map_t        map;

        int             thread_count, segment_count;
        int             command_size, header_size, tstate_size;
        int             hoffset;
        off_t           foffset;
        int             thread_count, segment_count;
        int             command_size, header_size, tstate_size;
        int             hoffset;
        off_t           foffset;

-       vm_map_offset_t vmoffset;
+       mach_vm_offset_t vmoffset;

        vm_offset_t     header;
        vm_offset_t     header;

-       vm_map_size_t   vmsize;
+       mach_vm_size_t  vmsize;

        vm_prot_t       prot;
        vm_prot_t       maxprot;
        vm_inherit_t    inherit;
        vm_prot_t       prot;
        vm_prot_t       maxprot;
        vm_inherit_t    inherit;

-       int             error1;
-       task_t          task;
-       char            core_name[MAXCOMLEN+6];
+       int             error1 = 0;
+       char            stack_name[MAXCOMLEN+6];
+       char            *alloced_name = NULL;

        char            *name;
        mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
        vm_size_t       mapsize;
        int             i;
        char            *name;
        mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
        vm_size_t       mapsize;
        int             i;

-       int nesting_depth = 0;
+       uint32_t nesting_depth = 0;

        kern_return_t   kret;
        struct vm_region_submap_info_64 vbr;
        kern_return_t   kret;
        struct vm_region_submap_info_64 vbr;

-       int vbrcount=0;
+       mach_msg_type_number_t vbrcount = 0;

        tir_t tir1;
        struct vnode * vp;
        tir_t tir1;
        struct vnode * vp;

-       struct mach_header      *mh;
-       struct mach_header_64   *mh64;
+       struct mach_header      *mh = NULL;     /* protected by is_64 */
+       struct mach_header_64   *mh64 = NULL;   /* protected by is_64 */

        int             is_64 = 0;
        size_t          mach_header_sz = sizeof(struct mach_header);
        size_t          segment_command_sz = sizeof(struct segment_command);
        int             is_64 = 0;
        size_t          mach_header_sz = sizeof(struct mach_header);
        size_t          segment_command_sz = sizeof(struct segment_command);

+       
+       if (current_proc() != core_proc) {
+               panic("coredump() called against proc that is not current_proc: %p", core_proc);
+       }

 
        if (do_coredump == 0 ||         /* Not dumping at all */
            ( (sugid_coredump == 0) &&  /* Not dumping SUID/SGID binaries */
 
        if (do_coredump == 0 ||         /* Not dumping at all */
            ( (sugid_coredump == 0) &&  /* Not dumping SUID/SGID binaries */

-             ( (cred->cr_svuid != cred->cr_ruid) ||
-               (cred->cr_svgid != cred->cr_rgid)))) {
-           
+             ( (kauth_cred_getsvuid(cred) != kauth_cred_getruid(cred)) ||
+               (kauth_cred_getsvgid(cred) != kauth_cred_getrgid(cred))))) {
+
+#if CONFIG_AUDIT
+               audit_proc_coredump(core_proc, NULL, EFAULT);
+#endif

                return (EFAULT);
        }
 
                return (EFAULT);
        }
 

-       if (IS_64BIT_PROCESS(p)) {
+       if (IS_64BIT_PROCESS(core_proc)) {

                is_64 = 1;
                mach_header_sz = sizeof(struct mach_header_64);
                segment_command_sz = sizeof(struct segment_command_64);
        }
 
                is_64 = 1;
                mach_header_sz = sizeof(struct mach_header_64);
                segment_command_sz = sizeof(struct segment_command_64);
        }
 

-       task = current_task();
-       map = current_map();

        mapsize = get_vmmap_size(map);
 
        mapsize = get_vmmap_size(map);
 

-       if (mapsize >=  p->p_rlimit[RLIMIT_CORE].rlim_cur)
+       if ((mapsize >=  core_proc->p_rlimit[RLIMIT_CORE].rlim_cur) && (ignore_ulimit == 0))

                return (EFAULT);
                return (EFAULT);

-       (void) task_suspend(task);
+       (void) task_suspend_internal(task);

 
 

-       /* create name according to sysctl'able format string */
-       name = proc_core_name(p->p_comm, kauth_cred_getuid(cred), p->p_pid);
+       MALLOC(alloced_name, char *, MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);

 
 

+       /* create name according to sysctl'able format string */

        /* if name creation fails, fall back to historical behaviour... */
        /* if name creation fails, fall back to historical behaviour... */

-       if (name == NULL) {
-               sprintf(core_name, "/cores/core.%d", p->p_pid);
-               name = core_name;
-       }
-       context.vc_proc = p;
-       context.vc_ucred = cred;
-
-       if ((error = vnode_open(name, (O_CREAT | FWRITE | O_NOFOLLOW), S_IRUSR, VNODE_LOOKUP_NOFOLLOW, &vp, &context)))
-               return (error);
+       if (alloced_name == NULL ||
+           proc_core_name(core_proc->p_comm, kauth_cred_getuid(cred),
+                          core_proc->p_pid, alloced_name, MAXPATHLEN)) {
+               snprintf(stack_name, sizeof(stack_name),
+                        "/cores/core.%d", core_proc->p_pid);
+               name = stack_name;
+       } else
+               name = alloced_name;
+
+       if ((error = vnode_open(name, (O_CREAT | FWRITE | O_NOFOLLOW), S_IRUSR, VNODE_LOOKUP_NOFOLLOW, &vp, ctx)))
+               goto out2;

 
        VATTR_INIT(&va);
        VATTR_WANTED(&va, va_nlink);
        /* Don't dump to non-regular files or files with links. */
        if (vp->v_type != VREG ||
 
        VATTR_INIT(&va);
        VATTR_WANTED(&va, va_nlink);
        /* Don't dump to non-regular files or files with links. */
        if (vp->v_type != VREG ||

-           vnode_getattr(vp, &va, &context) || va.va_nlink != 1) {
+           vnode_getattr(vp, &va, ctx) || va.va_nlink != 1) {

                error = EFAULT;
                goto out;
        }
 
        VATTR_INIT(&va);        /* better to do it here than waste more stack in vnode_setsize */
        VATTR_SET(&va, va_data_size, 0);
                error = EFAULT;
                goto out;
        }
 
        VATTR_INIT(&va);        /* better to do it here than waste more stack in vnode_setsize */
        VATTR_SET(&va, va_data_size, 0);

-       vnode_setattr(vp, &va, &context);
-       p->p_acflag |= ACORE;
+       vnode_setattr(vp, &va, ctx);
+       core_proc->p_acflag |= ACORE;
+
+       if ((reserve_mb > 0) &&
+           ((freespace_mb(vp) - (mapsize >> 20)) < reserve_mb)) {
+               error = ENOSPC;
+               goto out;
+       }

 
        /*
         *      If the task is modified while dumping the file
 
        /*
         *      If the task is modified while dumping the file


@@ -253,21 +313,22 @@ coredump(struct proc *p)
 
        thread_count = get_task_numacts(task);
        segment_count = get_vmmap_entries(map); /* XXX */
 
        thread_count = get_task_numacts(task);
        segment_count = get_vmmap_entries(map); /* XXX */

-       bcopy(thread_flavor_array,flavors,sizeof(thread_flavor_array));
+       tir1.flavor_count = sizeof(thread_flavor_array)/sizeof(mythread_state_flavor_t);
+       bcopy(thread_flavor_array, flavors,sizeof(thread_flavor_array));

        tstate_size = 0;
        tstate_size = 0;

-       for (i = 0; i < mynum_flavors; i++)
+       for (i = 0; i < tir1.flavor_count; i++)

                tstate_size += sizeof(mythread_state_flavor_t) +
                  (flavors[i].count * sizeof(int));
                tstate_size += sizeof(mythread_state_flavor_t) +
                  (flavors[i].count * sizeof(int));

-

        command_size = segment_count * segment_command_sz +
          thread_count*sizeof(struct thread_command) +
          tstate_size*thread_count;
 
        header_size = command_size + mach_header_sz;
 
        command_size = segment_count * segment_command_sz +
          thread_count*sizeof(struct thread_command) +
          tstate_size*thread_count;
 
        header_size = command_size + mach_header_sz;
 

-       (void) kmem_alloc(kernel_map,
-                                   (vm_offset_t *)&header,
-                                   (vm_size_t)header_size);
+       if (kmem_alloc(kernel_map, &header, (vm_size_t)header_size) != KERN_SUCCESS) {
+               error = ENOMEM;
+               goto out;
+       }

 
        /*
         *      Set up Mach-O header.
 
        /*
         *      Set up Mach-O header.


@@ -275,8 +336,8 @@ coredump(struct proc *p)
        if (is_64) {
                mh64 = (struct mach_header_64 *)header;
                mh64->magic = MH_MAGIC_64;
        if (is_64) {
                mh64 = (struct mach_header_64 *)header;
                mh64->magic = MH_MAGIC_64;

-               mh64->cputype = cpu_type();
-               mh64->cpusubtype = cpu_subtype();
+               mh64->cputype = process_cpu_type(core_proc);
+               mh64->cpusubtype = process_cpu_subtype(core_proc);

                mh64->filetype = MH_CORE;
                mh64->ncmds = segment_count + thread_count;
                mh64->sizeofcmds = command_size;
                mh64->filetype = MH_CORE;
                mh64->ncmds = segment_count + thread_count;
                mh64->sizeofcmds = command_size;


@@ -284,8 +345,8 @@ coredump(struct proc *p)
        } else {
                mh = (struct mach_header *)header;
                mh->magic = MH_MAGIC;
        } else {
                mh = (struct mach_header *)header;
                mh->magic = MH_MAGIC;

-               mh->cputype = cpu_type();
-               mh->cpusubtype = cpu_subtype();
+               mh->cputype = process_cpu_type(core_proc);
+               mh->cpusubtype = process_cpu_subtype(core_proc);

                mh->filetype = MH_CORE;
                mh->ncmds = segment_count + thread_count;
                mh->sizeofcmds = command_size;
                mh->filetype = MH_CORE;
                mh->ncmds = segment_count + thread_count;
                mh->sizeofcmds = command_size;


@@ -361,10 +422,10 @@ coredump(struct proc *p)
                        sc->cmdsize = sizeof(struct segment_command);
                        /* segment name is zeroed by kmem_alloc */
                        sc->segname[0] = 0;
                        sc->cmdsize = sizeof(struct segment_command);
                        /* segment name is zeroed by kmem_alloc */
                        sc->segname[0] = 0;

-                       sc->vmaddr = CAST_DOWN(vm_offset_t,vmoffset);
-                       sc->vmsize = CAST_DOWN(vm_size_t,vmsize);
-                       sc->fileoff = CAST_DOWN(uint32_t,foffset);
-                       sc->filesize = CAST_DOWN(uint32_t,vmsize);
+                       sc->vmaddr = CAST_DOWN_EXPLICIT(vm_offset_t,vmoffset);
+                       sc->vmsize = CAST_DOWN_EXPLICIT(vm_size_t,vmsize);
+                       sc->fileoff = CAST_DOWN_EXPLICIT(uint32_t,foffset); /* will never truncate */
+                       sc->filesize = CAST_DOWN_EXPLICIT(uint32_t,vmsize); /* will never truncate */

                        sc->maxprot = maxprot;
                        sc->initprot = prot;
                        sc->nsects = 0;
                        sc->maxprot = maxprot;
                        sc->initprot = prot;
                        sc->nsects = 0;


@@ -386,21 +447,11 @@ coredump(struct proc *p)
                if ((maxprot & VM_PROT_READ) == VM_PROT_READ
                        && vbr.user_tag != VM_MEMORY_IOKIT
                        && coredumpok(map,vmoffset)) {
                if ((maxprot & VM_PROT_READ) == VM_PROT_READ
                        && vbr.user_tag != VM_MEMORY_IOKIT
                        && coredumpok(map,vmoffset)) {

-                       vm_map_size_t   tmp_vmsize = vmsize;
-                       off_t           xfer_foffset = foffset;
-
-                       //LP64todo - works around vn_rdwr_64() 2G limit
-                       while (tmp_vmsize > 0) {
-                               vm_map_size_t   xfer_vmsize = tmp_vmsize;
-                               if (xfer_vmsize > INT_MAX)
-                                       xfer_vmsize = INT_MAX;
-                               error = vn_rdwr_64(UIO_WRITE, vp,
-                                               vmoffset, xfer_vmsize, xfer_foffset,
-                                       (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32), 
-                                       IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
-                               tmp_vmsize -= xfer_vmsize;
-                               xfer_foffset += xfer_vmsize;
-                       }
+                       
+                       error = vn_rdwr_64(UIO_WRITE, vp, vmoffset, vmsize, foffset,
+                                       (IS_64BIT_PROCESS(core_proc) ? UIO_USERSPACE64 : UIO_USERSPACE32), 
+                                       IO_NOCACHE|IO_NODELOCKED|IO_UNIT, cred, (int64_t *) 0, core_proc);
+

                }
 
                hoffset += segment_command_sz;
                }
 
                hoffset += segment_command_sz;


@@ -418,8 +469,10 @@ coredump(struct proc *p)
         */
        if (is_64) {
                mh64->ncmds -= segment_count;
         */
        if (is_64) {
                mh64->ncmds -= segment_count;

+               mh64->sizeofcmds -= segment_count * segment_command_sz;

        } else {
                mh->ncmds -= segment_count;
        } else {
                mh->ncmds -= segment_count;

+               mh->sizeofcmds -= segment_count * segment_command_sz;

        }
 
        tir1.header = header;
        }
 
        tir1.header = header;


@@ -433,10 +486,16 @@ coredump(struct proc *p)
         *      file.  OK to use a 32 bit write for this.
         */
        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,
         *      file.  OK to use a 32 bit write for this.
         */
        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,

-                       UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
+                       UIO_SYSSPACE, IO_NOCACHE|IO_NODELOCKED|IO_UNIT, cred, (int *) 0, core_proc);

        kmem_free(kernel_map, header, header_size);
 out:
        kmem_free(kernel_map, header, header_size);
 out:

-       error1 = vnode_close(vp, FWRITE, &context);
+       error1 = vnode_close(vp, FWRITE, ctx);
+out2:
+#if CONFIG_AUDIT
+       audit_proc_coredump(core_proc, name, error);
+#endif
+       if (alloced_name != NULL)
+               FREE(alloced_name, M_TEMP);

        if (error == 0)
                error = error1;
 
        if (error == 0)
                error = error1;