* This file contains machine independent code for performing core dumps.
*
*/
+#if CONFIG_COREDUMP
#include <mach/vm_param.h>
#include <mach/thread_status.h>
#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 */
mach_msg_type_number_t count; /* count of ints in this flavor */
} mythread_state_flavor_t;
-#if defined (__ppc__)
-/* 64 bit */
-mythread_state_flavor_t thread_flavor_array64[]={
- {PPC_THREAD_STATE64 , PPC_THREAD_STATE64_COUNT},
- {PPC_FLOAT_STATE, PPC_FLOAT_STATE_COUNT},
- {PPC_EXCEPTION_STATE64, PPC_EXCEPTION_STATE64_COUNT},
- {PPC_VECTOR_STATE, PPC_VECTOR_STATE_COUNT}
- };
-
-/* 32 bit */
-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}
- };
-
-#elif defined (__i386__)
+#if defined (__i386__) || defined (__x86_64__)
mythread_state_flavor_t thread_flavor_array [] = {
{x86_THREAD_STATE, x86_THREAD_STATE_COUNT},
{x86_FLOAT_STATE, x86_FLOAT_STATE_COUNT},
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;
+ }
+#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;
+ }
+#endif
+ return what_we_think;
+}
+
+static void
collectth_state(thread_t th_act, void *tirp)
{
vm_offset_t header;
t->hoffset = hoffset;
}
-
/*
* coredump
*
* 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
*/
#define MAX_TSTATE_FLAVORS 10
int
-coredump(proc_t core_proc)
+coredump(proc_t core_proc, uint32_t reserve_mb, int coredump_flags)
{
/* Begin assumptions that limit us to only the current process */
vfs_context_t ctx = vfs_context_current();
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 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(core_proc)) {
is_64 = 1;
mapsize = get_vmmap_size(map);
- if (mapsize >= core_proc->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);
+
+ (void) task_suspend_internal(task);
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 (proc_core_name(core_proc->p_comm, kauth_cred_getuid(cred),
+ 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);
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
* (e.g., changes in threads or VM, the resulting
thread_count = get_task_numacts(task);
segment_count = get_vmmap_entries(map); /* XXX */
-#if defined (__ppc__)
- if (is_64) {
- tir1.flavor_count = sizeof(thread_flavor_array64)/sizeof(mythread_state_flavor_t);
- bcopy(thread_flavor_array64, flavors,sizeof(thread_flavor_array64));
- } else {
-#endif /* __ppc __ */
- tir1.flavor_count = sizeof(thread_flavor_array)/sizeof(mythread_state_flavor_t);
- bcopy(thread_flavor_array, flavors,sizeof(thread_flavor_array));
-#if defined (__ppc__)
- }
-#endif /* __ppc __ */
+ 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 < tir1.flavor_count; i++)
tstate_size += sizeof(mythread_state_flavor_t) +
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.
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;
} 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;
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;
}
/*
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,
+
+ error = vn_rdwr_64(UIO_WRITE, vp, vmoffset, vmsize, foffset,
(IS_64BIT_PROCESS(core_proc) ? UIO_USERSPACE64 : UIO_USERSPACE32),
- IO_NODELOCKED|IO_UNIT, cred, (int *) 0, core_proc);
- tmp_vmsize -= xfer_vmsize;
- xfer_foffset += xfer_vmsize;
- }
+ IO_NOCACHE|IO_NODELOCKED|IO_UNIT, cred, (int64_t *) 0, core_proc);
+
}
hoffset += segment_command_sz;
* 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, core_proc);
+ 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, 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)
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 */
projects / apple / xnu.git / blobdiff