X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/ff6e181ae92fc6f1e89841290f461d1f2f9badd9..d9a64523371fa019c4575bb400cbbc3a50ac9903:/bsd/kern/kern_core.c?ds=sidebyside
diff --git a/bsd/kern/kern_core.c b/bsd/kern/kern_core.c
index 85575c2da..07acd675c 100644
--- a/bsd/kern/kern_core.c
+++ b/bsd/kern/kern_core.c
@@ -1,14 +1,19 @@
/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
@@ -18,7 +23,7 @@
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
*
@@ -27,10 +32,11 @@
* This file contains machine independent code for performing core dumps.
*
*/
+#if CONFIG_COREDUMP
#include <mach/vm_param.h>
#include <mach/thread_status.h>
-
+#include <sys/content_protection.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
@@ -58,34 +64,40 @@
#include <mach/task.h> /* task_suspend() */
#include <kern/task.h> /* get_task_numacts() */
+#include <security/audit/audit.h>
+
+#if CONFIG_CSR
+#include <sys/codesign.h>
+#include <sys/csr.h>
+#endif
+
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;
-#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 [] = {
- {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;
+#elif defined (__arm__)
+mythread_state_flavor_t thread_flavor_array[]={
+ {ARM_THREAD_STATE , ARM_THREAD_STATE_COUNT},
+ {ARM_VFP_STATE, ARM_VFP_STATE_COUNT},
+ {ARM_EXCEPTION_STATE, ARM_EXCEPTION_STATE_COUNT}
+ };
+int mynum_flavors=3;
+#elif defined (__arm64__)
+mythread_state_flavor_t thread_flavor_array[]={
+ {ARM_THREAD_STATE64 , ARM_THREAD_STATE64_COUNT},
+ /* ARM64_TODO: VFP */
+ {ARM_EXCEPTION_STATE64, ARM_EXCEPTION_STATE64_COUNT}
+ };
+int mynum_flavors=2;
#else
#error architecture not supported
#endif
@@ -96,21 +108,69 @@ typedef struct {
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);
+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,
+kern_return_t thread_getstatus(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 *);
+#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 */
+
-__private_extern__ int do_coredump = 1; /* default: dump cores */
-__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. */
-void
+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;
+ }
+#elif defined (__arm__) || defined(__arm64__)
+ if (IS_64BIT_PROCESS(core_proc)) {
+ what_we_think = CPU_TYPE_ARM64;
+ } else {
+ what_we_think = CPU_TYPE_ARM;
+ }
+#endif
+
+ return what_we_think;
+}
+
+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;
+ }
+#elif defined (__arm__) || defined(__arm64__)
+ if (IS_64BIT_PROCESS(core_proc)) {
+ what_we_think = CPU_SUBTYPE_ARM64_ALL;
+ } else {
+ what_we_think = CPU_SUBTYPE_ARM_ALL;
+ }
+#endif
+ return what_we_think;
+}
+
+static void
collectth_state(thread_t th_act, void *tirp)
{
vm_offset_t header;
@@ -136,7 +196,7 @@ collectth_state(thread_t th_act, void *tirp)
* 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);
@@ -150,95 +210,145 @@ collectth_state(thread_t th_act, void *tirp)
}
/*
- * 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.
+ * coredump_flags Extra options (ignore rlimit, run fsync)
+ *
+ * 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
-coredump(struct proc *p)
+coredump(proc_t core_proc, uint32_t reserve_mb, int coredump_flags)
{
- 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 vfs_context context;
- vm_map_t map;
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_map_size_t vmsize;
+ mach_vm_size_t vmsize;
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;
- int nesting_depth = 0;
+ uint32_t nesting_depth = 0;
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;
- 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);
+
+ 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 */
- ( (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);
+ }
+
+#if CONFIG_CSR
+ /* If the process is restricted, CSR isn't configured to allow
+ * restricted processes to be debugged, and CSR isn't configured in
+ * AppleInternal mode, then don't dump core. */
+ if (cs_restricted(core_proc) &&
+ csr_check(CSR_ALLOW_TASK_FOR_PID) &&
+ csr_check(CSR_ALLOW_APPLE_INTERNAL)) {
+#if CONFIG_AUDIT
+ audit_proc_coredump(core_proc, NULL, EFAULT);
+#endif
return (EFAULT);
}
+#endif
- 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);
}
- task = current_task();
- map = current_map();
mapsize = get_vmmap_size(map);
- if (mapsize >= p->p_rlimit[RLIMIT_CORE].rlim_cur)
+ if (((coredump_flags & COREDUMP_IGNORE_ULIMIT) == 0) &&
+ (mapsize >= core_proc->p_rlimit[RLIMIT_CORE].rlim_cur))
return (EFAULT);
- (void) task_suspend(task);
- /* create name according to sysctl'able format string */
- name = proc_core_name(p->p_comm, kauth_cred_getuid(cred), p->p_pid);
+ (void) task_suspend_internal(task);
- /* 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;
+ MALLOC(alloced_name, char *, MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
- if ((error = vnode_open(name, (O_CREAT | FWRITE | O_NOFOLLOW), S_IRUSR, VNODE_LOOKUP_NOFOLLOW, &vp, &context)))
- return (error);
+ /* create name according to sysctl'able format string */
+ /* if name creation fails, fall back to historical behaviour... */
+ 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 ||
- 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);
- vnode_setattr(vp, &va, &context);
- p->p_acflag |= ACORE;
+ if (core_proc == initproc) {
+ VATTR_SET(&va, va_dataprotect_class, PROTECTION_CLASS_D);
+ }
+ 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
@@ -248,21 +358,22 @@ coredump(struct proc *p)
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;
- 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));
-
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, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) {
+ error = ENOMEM;
+ goto out;
+ }
/*
* Set up Mach-O header.
@@ -270,8 +381,8 @@ coredump(struct proc *p)
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;
@@ -279,8 +390,8 @@ coredump(struct proc *p)
} 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;
@@ -350,19 +461,21 @@ coredump(struct proc *p)
sc64->maxprot = maxprot;
sc64->initprot = prot;
sc64->nsects = 0;
+ sc64->flags = 0;
} else {
sc = (struct segment_command *) (header + hoffset);
sc->cmd = LC_SEGMENT;
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->flags = 0;
}
/*
@@ -381,21 +494,11 @@ coredump(struct proc *p)
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;
@@ -413,8 +516,10 @@ coredump(struct proc *p)
*/
if (is_64) {
mh64->ncmds -= segment_count;
+ mh64->sizeofcmds -= segment_count * segment_command_sz;
} else {
mh->ncmds -= segment_count;
+ mh->sizeofcmds -= segment_count * segment_command_sz;
}
tir1.header = header;
@@ -428,12 +533,29 @@ 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,
- 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);
+
+ if ((coredump_flags & COREDUMP_FULLFSYNC) && error == 0)
+ error = VNOP_IOCTL(vp, F_FULLFSYNC, (caddr_t)NULL, 0, ctx);
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;
return (error);
}
+
+#else /* CONFIG_COREDUMP */
+
+/* When core dumps aren't needed, no need to compile this file at all */
+
+#error assertion failed: this section is not compiled
+
+#endif /* CONFIG_COREDUMP */