1 files changed, 194 insertions, 130 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index b8bca1e..4510429 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1395,7 +1395,8 @@ static int writenote(struct memelfnote *men, struct file *file,
 	if (!dump_seek(file, (off))) \
 		goto end_coredump;
 
-static void fill_elf_header(struct elfhdr *elf, int segs)
+static void fill_elf_header(struct elfhdr *elf, int segs,
+			    u16 machine, u32 flags, u8 osabi)
 {
 	memcpy(elf->e_ident, ELFMAG, SELFMAG);
 	elf->e_ident[EI_CLASS] = ELF_CLASS;
@@ -1405,12 +1406,12 @@ static void fill_elf_header(struct elfhdr *elf, int segs)
 	memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
 
 	elf->e_type = ET_CORE;
-	elf->e_machine = ELF_ARCH;
+	elf->e_machine = machine;
 	elf->e_version = EV_CURRENT;
 	elf->e_entry = 0;
 	elf->e_phoff = sizeof(struct elfhdr);
 	elf->e_shoff = 0;
-	elf->e_flags = ELF_CORE_EFLAGS;
+	elf->e_flags = flags;
 	elf->e_ehsize = sizeof(struct elfhdr);
 	elf->e_phentsize = sizeof(struct elf_phdr);
 	elf->e_phnum = segs;
@@ -1517,6 +1518,16 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
 	return 0;
 }
 
+static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
+{
+	elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
+	int i = 0;
+	do
+		i += 2;
+	while (auxv[i - 2] != AT_NULL);
+	fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
+}
+
 /* Here is the structure in which status of each thread is captured. */
 struct elf_thread_status
 {
@@ -1569,6 +1580,174 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
 	return sz;
 }
 
+struct elf_note_info {
+	struct memelfnote *notes;
+	struct elf_prstatus *prstatus;	/* NT_PRSTATUS */
+	struct elf_prpsinfo *psinfo;	/* NT_PRPSINFO */
+	struct list_head thread_list;
+	elf_fpregset_t *fpu;
+#ifdef ELF_CORE_COPY_XFPREGS
+	elf_fpxregset_t *xfpu;
+#endif
+	int thread_status_size;
+	int numnote;
+};
+
+static int fill_note_info(struct elfhdr *elf, int phdrs,
+			  struct elf_note_info *info,
+			  long signr, struct pt_regs *regs)
+{
+#define	NUM_NOTES	6
+	struct list_head *t;
+	struct task_struct *g, *p;
+
+	info->notes = NULL;
+	info->prstatus = NULL;
+	info->psinfo = NULL;
+	info->fpu = NULL;
+#ifdef ELF_CORE_COPY_XFPREGS
+	info->xfpu = NULL;
+#endif
+	INIT_LIST_HEAD(&info->thread_list);
+
+	info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote),
+			      GFP_KERNEL);
+	if (!info->notes)
+		return 0;
+	info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
+	if (!info->psinfo)
+		return 0;
+	info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
+	if (!info->prstatus)
+		return 0;
+	info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
+	if (!info->fpu)
+		return 0;
+#ifdef ELF_CORE_COPY_XFPREGS
+	info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
+	if (!info->xfpu)
+		return 0;
+#endif
+
+	info->thread_status_size = 0;
+	if (signr) {
+		struct elf_thread_status *tmp;
+		rcu_read_lock();
+		do_each_thread(g, p)
+			if (current->mm == p->mm && current != p) {
+				tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
+				if (!tmp) {
+					rcu_read_unlock();
+					return 0;
+				}
+				tmp->thread = p;
+				list_add(&tmp->list, &info->thread_list);
+			}
+		while_each_thread(g, p);
+		rcu_read_unlock();
+		list_for_each(t, &info->thread_list) {
+			struct elf_thread_status *tmp;
+			int sz;
+
+			tmp = list_entry(t, struct elf_thread_status, list);
+			sz = elf_dump_thread_status(signr, tmp);
+			info->thread_status_size += sz;
+		}
+	}
+	/* now collect the dump for the current */
+	memset(info->prstatus, 0, sizeof(*info->prstatus));
+	fill_prstatus(info->prstatus, current, signr);
+	elf_core_copy_regs(&info->prstatus->pr_reg, regs);
+
+	/* Set up header */
+	fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI);
+
+	/*
+	 * Set up the notes in similar form to SVR4 core dumps made
+	 * with info from their /proc.
+	 */
+
+	fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
+		  sizeof(*info->prstatus), info->prstatus);
+	fill_psinfo(info->psinfo, current->group_leader, current->mm);
+	fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
+		  sizeof(*info->psinfo), info->psinfo);
+
+	info->numnote = 2;
+
+	fill_auxv_note(&info->notes[info->numnote++], current->mm);
+
+	/* Try to dump the FPU. */
+	info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
+							       info->fpu);
+	if (info->prstatus->pr_fpvalid)
+		fill_note(info->notes + info->numnote++,
+			  "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+	if (elf_core_copy_task_xfpregs(current, info->xfpu))
+		fill_note(info->notes + info->numnote++,
+			  "LINUX", ELF_CORE_XFPREG_TYPE,
+			  sizeof(*info->xfpu), info->xfpu);
+#endif
+
+	return 1;
+
+#undef NUM_NOTES
+}
+
+static size_t get_note_info_size(struct elf_note_info *info)
+{
+	int sz = 0;
+	int i;
+
+	for (i = 0; i < info->numnote; i++)
+		sz += notesize(info->notes + i);
+
+	sz += info->thread_status_size;
+
+	return sz;
+}
+
+static int write_note_info(struct elf_note_info *info,
+			   struct file *file, loff_t *foffset)
+{
+	int i;
+	struct list_head *t;
+
+	for (i = 0; i < info->numnote; i++)
+		if (!writenote(info->notes + i, file, foffset))
+			return 0;
+
+	/* write out the thread status notes section */
+	list_for_each(t, &info->thread_list) {
+		struct elf_thread_status *tmp =
+				list_entry(t, struct elf_thread_status, list);
+
+		for (i = 0; i < tmp->num_notes; i++)
+			if (!writenote(&tmp->notes[i], file, foffset))
+				return 0;
+	}
+
+	return 1;
+}
+
+static void free_note_info(struct elf_note_info *info)
+{
+	while (!list_empty(&info->thread_list)) {
+		struct list_head *tmp = info->thread_list.next;
+		list_del(tmp);
+		kfree(list_entry(tmp, struct elf_thread_status, list));
+	}
+
+	kfree(info->prstatus);
+	kfree(info->psinfo);
+	kfree(info->notes);
+	kfree(info->fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+	kfree(info->xfpu);
+#endif
+}
+
 static struct vm_area_struct *first_vma(struct task_struct *tsk,
 					struct vm_area_struct *gate_vma)
 {
@@ -1604,29 +1783,15 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
  */
 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
 {
-#define	NUM_NOTES	6
 	int has_dumped = 0;
 	mm_segment_t fs;
 	int segs;
 	size_t size = 0;
-	int i;
 	struct vm_area_struct *vma, *gate_vma;
 	struct elfhdr *elf = NULL;
 	loff_t offset = 0, dataoff, foffset;
-	int numnote;
-	struct memelfnote *notes = NULL;
-	struct elf_prstatus *prstatus = NULL;	/* NT_PRSTATUS */
-	struct elf_prpsinfo *psinfo = NULL;	/* NT_PRPSINFO */
- 	struct task_struct *g, *p;
- 	LIST_HEAD(thread_list);
- 	struct list_head *t;
-	elf_fpregset_t *fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
-	elf_fpxregset_t *xfpu = NULL;
-#endif
-	int thread_status_size = 0;
-	elf_addr_t *auxv;
 	unsigned long mm_flags;
+	struct elf_note_info info;
 
 	/*
 	 * We no longer stop all VM operations.
@@ -1644,52 +1809,6 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 	elf = kmalloc(sizeof(*elf), GFP_KERNEL);
 	if (!elf)
 		goto cleanup;
-	prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
-	if (!prstatus)
-		goto cleanup;
-	psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
-	if (!psinfo)
-		goto cleanup;
-	notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
-	if (!notes)
-		goto cleanup;
-	fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
-	if (!fpu)
-		goto cleanup;
-#ifdef ELF_CORE_COPY_XFPREGS
-	xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
-	if (!xfpu)
-		goto cleanup;
-#endif
-
-	if (signr) {
-		struct elf_thread_status *tmp;
-		rcu_read_lock();
-		do_each_thread(g,p)
-			if (current->mm == p->mm && current != p) {
-				tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
-				if (!tmp) {
-					rcu_read_unlock();
-					goto cleanup;
-				}
-				tmp->thread = p;
-				list_add(&tmp->list, &thread_list);
-			}
-		while_each_thread(g,p);
-		rcu_read_unlock();
-		list_for_each(t, &thread_list) {
-			struct elf_thread_status *tmp;
-			int sz;
-
-			tmp = list_entry(t, struct elf_thread_status, list);
-			sz = elf_dump_thread_status(signr, tmp);
-			thread_status_size += sz;
-		}
-	}
-	/* now collect the dump for the current */
-	memset(prstatus, 0, sizeof(*prstatus));
-	fill_prstatus(prstatus, current, signr);
-	elf_core_copy_regs(&prstatus->pr_reg, regs);
 	
 	segs = current->mm->map_count;
 #ifdef ELF_CORE_EXTRA_PHDRS
@@ -1700,42 +1819,16 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 	if (gate_vma != NULL)
 		segs++;
 
-	/* Set up header */
-	fill_elf_header(elf, segs + 1);	/* including notes section */
-
-	has_dumped = 1;
-	current->flags |= PF_DUMPCORE;
-
 	/*
-	 * Set up the notes in similar form to SVR4 core dumps made
-	 * with info from their /proc.
+	 * Collect all the non-memory information about the process for the
+	 * notes.  This also sets up the file header.
 	 */
+	if (!fill_note_info(elf, segs + 1, /* including notes section */
+			    &info, signr, regs))
+		goto cleanup;
 
-	fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
-	fill_psinfo(psinfo, current->group_leader, current->mm);
-	fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
-	
-	numnote = 2;
-
-	auxv = (elf_addr_t *)current->mm->saved_auxv;
-
-	i = 0;
-	do
-		i += 2;
-	while (auxv[i - 2] != AT_NULL);
-	fill_note(&notes[numnote++], "CORE", NT_AUXV,
-		  i * sizeof(elf_addr_t), auxv);
-
-  	/* Try to dump the FPU. */
-	if ((prstatus->pr_fpvalid =
-	     elf_core_copy_task_fpregs(current, regs, fpu)))
-		fill_note(notes + numnote++,
-			  "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
-	if (elf_core_copy_task_xfpregs(current, xfpu))
-		fill_note(notes + numnote++,
-			  "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
-#endif	
+	has_dumped = 1;
+	current->flags |= PF_DUMPCORE;
   
 	fs = get_fs();
 	set_fs(KERNEL_DS);
@@ -1748,12 +1841,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 	/* Write notes phdr entry */
 	{
 		struct elf_phdr phdr;
-		int sz = 0;
-
-		for (i = 0; i < numnote; i++)
-			sz += notesize(notes + i);
-		
-		sz += thread_status_size;
+		size_t sz = get_note_info_size(&info);
 
 		sz += elf_coredump_extra_notes_size();
 
@@ -1798,23 +1886,12 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 #endif
 
  	/* write out the notes section */
-	for (i = 0; i < numnote; i++)
-		if (!writenote(notes + i, file, &foffset))
-			goto end_coredump;
+	if (!write_note_info(&info, file, &foffset))
+		goto end_coredump;
 
 	if (elf_coredump_extra_notes_write(file, &foffset))
 		goto end_coredump;
 
-	/* write out the thread status notes section */
-	list_for_each(t, &thread_list) {
-		struct elf_thread_status *tmp =
-				list_entry(t, struct elf_thread_status, list);
-
-		for (i = 0; i < tmp->num_notes; i++)
-			if (!writenote(&tmp->notes[i], file, &foffset))
-				goto end_coredump;
-	}
-
 	/* Align to page */
 	DUMP_SEEK(dataoff - foffset);
 
@@ -1865,22 +1942,9 @@ end_coredump:
 	set_fs(fs);
 
 cleanup:
-	while (!list_empty(&thread_list)) {
-		struct list_head *tmp = thread_list.next;
-		list_del(tmp);
-		kfree(list_entry(tmp, struct elf_thread_status, list));
-	}
-
 	kfree(elf);
-	kfree(prstatus);
-	kfree(psinfo);
-	kfree(notes);
-	kfree(fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
-	kfree(xfpu);
-#endif
+	free_note_info(&info);
 	return has_dumped;
-#undef NUM_NOTES
 }
 
 #endif		/* USE_ELF_CORE_DUMP */