X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/39236c6e673c41db228275375ab7fdb0f837b292..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/bsd/kern/kern_core.c diff --git a/bsd/kern/kern_core.c b/bsd/kern/kern_core.c index fd832d4c5..a4a3ee6cf 100644 --- a/bsd/kern/kern_core.c +++ b/bsd/kern/kern_core.c @@ -2,7 +2,7 @@ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @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 @@ -11,10 +11,10 @@ * 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 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -22,7 +22,7 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * + * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved. @@ -32,10 +32,11 @@ * This file contains machine independent code for performing core dumps. * */ +#if CONFIG_COREDUMP #include #include - +#include #include #include #include @@ -58,56 +59,68 @@ #include #include /* last */ -#include /* current_map() */ -#include /* mach_vm_region_recurse() */ -#include /* task_suspend() */ -#include /* get_task_numacts() */ +#include /* current_map() */ +#include /* mach_vm_region_recurse() */ +#include /* task_suspend() */ +#include /* get_task_numacts() */ #include +#if CONFIG_MACF +#include +#endif /* CONFIG_MACF */ + typedef struct { - int flavor; /* the number for this flavor */ - mach_msg_type_number_t count; /* count of ints in this flavor */ + 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 (__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}, - {x86_EXCEPTION_STATE, x86_EXCEPTION_STATE_COUNT}, - }; -int mynum_flavors=3; +mythread_state_flavor_t thread_flavor_array[] = { + {x86_THREAD_STATE, x86_THREAD_STATE_COUNT}, + {x86_FLOAT_STATE, x86_FLOAT_STATE_COUNT}, + {x86_EXCEPTION_STATE, x86_EXCEPTION_STATE_COUNT}, +}; +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 typedef struct { - vm_offset_t header; - int hoffset; + vm_offset_t header; + size_t hoffset; mythread_state_flavor_t *flavors; - int tstate_size; - int flavor_count; + size_t tstate_size; + size_t 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, - 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); +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 */ +__XNU_PRIVATE_EXTERN int do_coredump = 0; /* default: don't dump cores */ #else -__XNU_PRIVATE_EXTERN int do_coredump = 1; /* default: dump cores */ +__XNU_PRIVATE_EXTERN int do_coredump = 1; /* default: dump cores */ #endif __XNU_PRIVATE_EXTERN int sugid_coredump = 0; /* default: but not SGUID binaries */ @@ -120,12 +133,19 @@ 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)) { + 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; } @@ -134,55 +154,60 @@ 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)) { + 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; } -void +static void collectth_state(thread_t th_act, void *tirp) { - vm_offset_t header; - int hoffset, i ; + vm_offset_t header; + size_t hoffset, i; mythread_state_flavor_t *flavors; - struct thread_command *tc; + struct thread_command *tc; tir_t *t = (tir_t *)tirp; - /* - * Fill in thread command structure. - */ - header = t->header; - hoffset = t->hoffset; - flavors = t->flavors; - - tc = (struct thread_command *) (header + hoffset); - tc->cmd = LC_THREAD; - tc->cmdsize = sizeof(struct thread_command) - + t->tstate_size; - hoffset += sizeof(struct thread_command); - /* - * Follow with a struct thread_state_flavor and - * the appropriate thread state struct for each - * thread state flavor. - */ - for (i = 0; i < t->flavor_count; i++) { - *(mythread_state_flavor_t *)(header+hoffset) = - flavors[i]; - hoffset += sizeof(mythread_state_flavor_t); - thread_getstatus(th_act, flavors[i].flavor, - (thread_state_t)(header+hoffset), - &flavors[i].count); - hoffset += flavors[i].count*sizeof(int); - } + /* + * Fill in thread command structure. + */ + header = t->header; + hoffset = t->hoffset; + flavors = t->flavors; + + tc = (struct thread_command *) (header + hoffset); + tc->cmd = LC_THREAD; + tc->cmdsize = (uint32_t)(sizeof(struct thread_command) + + t->tstate_size); + hoffset += sizeof(struct thread_command); + /* + * Follow with a struct thread_state_flavor and + * the appropriate thread state struct for each + * thread state flavor. + */ + for (i = 0; i < t->flavor_count; i++) { + *(mythread_state_flavor_t *)(header + hoffset) = + flavors[i]; + hoffset += sizeof(mythread_state_flavor_t); + thread_getstatus(th_act, flavors[i].flavor, + (thread_state_t)(header + hoffset), + &flavors[i].count); + hoffset += flavors[i].count * sizeof(int); + } - t->hoffset = hoffset; + t->hoffset = hoffset; } - /* * coredump * @@ -192,66 +217,74 @@ collectth_state(thread_t th_act, void *tirp) * 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. + * coredump_flags Extra options (ignore rlimit, run fsync) * * Returns: 0 Success - * EFAULT Failed + * !0 Failure errno * * 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 +#define MAX_TSTATE_FLAVORS 10 int -coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) +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(); - vm_map_t map = current_map(); - task_t task = current_task(); + 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; - int thread_count, segment_count; - int command_size, header_size, tstate_size; - int hoffset; - off_t foffset; + size_t thread_count, segment_count; + size_t command_size, header_size, tstate_size; + size_t hoffset; + off_t foffset; mach_vm_offset_t vmoffset; - vm_offset_t header; - mach_vm_size_t vmsize; - vm_prot_t prot; - vm_prot_t maxprot; - vm_inherit_t inherit; - int error1 = 0; - char stack_name[MAXCOMLEN+6]; - char *alloced_name = NULL; - char *name; + vm_offset_t header; + mach_vm_size_t vmsize; + vm_prot_t prot; + vm_prot_t maxprot; + vm_inherit_t inherit; + int error1 = 0; + char stack_name[MAXCOMLEN + 6]; + char *alloced_name = NULL; + char *name = NULL; mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS]; - vm_size_t mapsize; - int i; + vm_size_t mapsize; + size_t i; uint32_t nesting_depth = 0; - kern_return_t kret; + kern_return_t kret; struct vm_region_submap_info_64 vbr; mach_msg_type_number_t vbrcount = 0; tir_t tir1; struct vnode * vp; - 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); + 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 */ - ( (kauth_cred_getsvuid(cred) != kauth_cred_getruid(cred)) || - (kauth_cred_getsvgid(cred) != kauth_cred_getrgid(cred))))) { + if (do_coredump == 0 || /* Not dumping at all */ + ((sugid_coredump == 0) && /* Not dumping SUID/SGID binaries */ + ((kauth_cred_getsvuid(cred) != kauth_cred_getruid(cred)) || + (kauth_cred_getsvgid(cred) != kauth_cred_getrgid(cred))))) { + error = EFAULT; + goto out2; + } -#if CONFIG_AUDIT - audit_proc_coredump(core_proc, NULL, EFAULT); -#endif - return (EFAULT); +#if CONFIG_MACF + error = mac_proc_check_dump_core(core_proc); + if (error != 0) { + goto out2; } +#endif if (IS_64BIT_PROCESS(core_proc)) { is_64 = 1; @@ -261,8 +294,12 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) mapsize = get_vmmap_size(map); - if ((mapsize >= core_proc->p_rlimit[RLIMIT_CORE].rlim_cur) && (ignore_ulimit == 0)) - return (EFAULT); + if (((coredump_flags & COREDUMP_IGNORE_ULIMIT) == 0) && + (mapsize >= proc_limitgetcur(core_proc, RLIMIT_CORE, FALSE))) { + error = EFAULT; + goto out2; + } + (void) task_suspend_internal(task); MALLOC(alloced_name, char *, MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO); @@ -271,15 +308,17 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) /* 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)) { + core_proc->p_pid, alloced_name, MAXPATHLEN)) { snprintf(stack_name, sizeof(stack_name), - "/cores/core.%d", core_proc->p_pid); + "/cores/core.%d", core_proc->p_pid); name = stack_name; - } else + } else { name = alloced_name; + } - if ((error = vnode_open(name, (O_CREAT | FWRITE | O_NOFOLLOW), S_IRUSR, VNODE_LOOKUP_NOFOLLOW, &vp, ctx))) + 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); @@ -290,8 +329,11 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) goto out; } - VATTR_INIT(&va); /* better to do it here than waste more stack in vnode_setsize */ + VATTR_INIT(&va); /* better to do it here than waste more stack in vnode_setsize */ VATTR_SET(&va, va_data_size, 0); + if (core_proc == initproc) { + VATTR_SET(&va, va_dataprotect_class, PROTECTION_CLASS_D); + } vnode_setattr(vp, &va, ctx); core_proc->p_acflag |= ACORE; @@ -308,20 +350,44 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) */ thread_count = get_task_numacts(task); - segment_count = get_vmmap_entries(map); /* XXX */ - tir1.flavor_count = sizeof(thread_flavor_array)/sizeof(mythread_state_flavor_t); - bcopy(thread_flavor_array, flavors,sizeof(thread_flavor_array)); + segment_count = get_vmmap_entries(map); /* XXX */ + 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++) + 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; + (flavors[i].count * sizeof(int)); + } + + { + size_t lhs; + size_t rhs; + + /* lhs = segment_count * segment_command_sz */ + if (os_mul_overflow(segment_count, segment_command_sz, &lhs)) { + error = ENOMEM; + goto out; + } - header_size = command_size + mach_header_sz; + /* rhs = (tstate_size + sizeof(struct thread_command)) * thread_count */ + if (os_add_and_mul_overflow(tstate_size, sizeof(struct thread_command), thread_count, &rhs)) { + error = ENOMEM; + goto out; + } - if (kmem_alloc(kernel_map, &header, (vm_size_t)header_size) != KERN_SUCCESS) { + /* command_size = lhs + rhs */ + if (os_add_overflow(lhs, rhs, &command_size)) { + error = ENOMEM; + goto out; + } + } + + if (os_add_overflow(command_size, mach_header_sz, &header_size)) { + error = ENOMEM; + goto out; + } + + if (kmem_alloc(kernel_map, &header, (vm_size_t)header_size, VM_KERN_MEMORY_DIAG) != KERN_SUCCESS) { error = ENOMEM; goto out; } @@ -335,41 +401,41 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) 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->reserved = 0; /* 8 byte alignment */ + mh64->ncmds = (uint32_t)(segment_count + thread_count); + mh64->sizeofcmds = (uint32_t)command_size; + mh64->reserved = 0; /* 8 byte alignment */ } else { mh = (struct mach_header *)header; mh->magic = MH_MAGIC; 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->ncmds = (uint32_t)(segment_count + thread_count); + mh->sizeofcmds = (uint32_t)command_size; } - hoffset = mach_header_sz; /* offset into header */ - foffset = round_page(header_size); /* offset into file */ - vmoffset = MACH_VM_MIN_ADDRESS; /* offset into VM */ + hoffset = mach_header_sz; /* offset into header */ + foffset = round_page(header_size); /* offset into file */ + vmoffset = MACH_VM_MIN_ADDRESS; /* offset into VM */ /* - * We use to check for an error, here, now we try and get + * We use to check for an error, here, now we try and get * as much as we can */ while (segment_count > 0) { - struct segment_command *sc; - struct segment_command_64 *sc64; + struct segment_command *sc; + struct segment_command_64 *sc64; /* * Get region information for next region. */ - + while (1) { vbrcount = VM_REGION_SUBMAP_INFO_COUNT_64; - if((kret = mach_vm_region_recurse(map, - &vmoffset, &vmsize, &nesting_depth, - (vm_region_recurse_info_t)&vbr, - &vbrcount)) != KERN_SUCCESS) { + if ((kret = mach_vm_region_recurse(map, + &vmoffset, &vmsize, &nesting_depth, + (vm_region_recurse_info_t)&vbr, + &vbrcount)) != KERN_SUCCESS) { break; } /* @@ -380,18 +446,19 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) */ if (!(is_64) && (vmoffset + vmsize > VM_MAX_ADDRESS)) { - kret = KERN_INVALID_ADDRESS; + kret = KERN_INVALID_ADDRESS; break; } - if(vbr.is_submap) { + if (vbr.is_submap) { nesting_depth++; continue; } else { break; } } - if(kret != KERN_SUCCESS) + if (kret != KERN_SUCCESS) { break; + } prot = vbr.protection; maxprot = vbr.max_protection; @@ -412,19 +479,21 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) sc64->maxprot = maxprot; sc64->initprot = prot; sc64->nsects = 0; - } else { + 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_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->vmaddr = CAST_DOWN_EXPLICIT(uint32_t, vmoffset); + sc->vmsize = CAST_DOWN_EXPLICIT(uint32_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; } /* @@ -433,7 +502,7 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) */ if ((prot & VM_PROT_READ) == 0) { mach_vm_protect(map, vmoffset, vmsize, FALSE, - prot|VM_PROT_READ); + prot | VM_PROT_READ); } /* * Only actually perform write if we can read. @@ -441,13 +510,11 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) * a hole in the file. */ if ((maxprot & VM_PROT_READ) == VM_PROT_READ - && vbr.user_tag != VM_MEMORY_IOKIT - && coredumpok(map,vmoffset)) { - + && vbr.user_tag != VM_MEMORY_IOKIT + && coredumpok(map, vmoffset)) { 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); - + (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; @@ -475,25 +542,39 @@ coredump(proc_t core_proc, uint32_t reserve_mb, int ignore_ulimit) tir1.hoffset = hoffset; tir1.flavors = flavors; tir1.tstate_size = tstate_size; - task_act_iterate_wth_args(task, collectth_state,&tir1); + task_act_iterate_wth_args(task, collectth_state, &tir1); /* * Write out the Mach header at the beginning of the * 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_SYSSPACE, IO_NOCACHE|IO_NODELOCKED|IO_UNIT, cred, (int *) 0, core_proc); + error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, (int)MIN(header_size, INT_MAX), (off_t)0, + 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) + if (alloced_name != NULL) { FREE(alloced_name, M_TEMP); - if (error == 0) + } + if (error == 0) { error = error1; + } - return (error); + 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 */