patch-2.3.99-pre6 linux/fs/binfmt_elf.c

• Lines: 151
• Date: Mon Apr 24 17:57:42 2000
• Orig file: v2.3.99-pre5/linux/fs/binfmt_elf.c
• Orig date: Mon Mar 27 08:08:29 2000

diff -u --recursive --new-file v2.3.99-pre5/linux/fs/binfmt_elf.c linux/fs/binfmt_elf.c
@@ -479,10 +479,22 @@
 #ifdef __sparc__
 			if (ibcs2_interpreter) {
 				unsigned long old_pers = current->personality;
-					
-				current->personality = PER_SVR4;
+				struct exec_domain *old_domain = current->exec_domain;
+				struct exec_domain *new_domain;
+				struct fs_struct *old_fs = current->fs, *new_fs;
+				get_exec_domain(old_domain);
+				atomic_inc(&old_fs->count);
+
+				set_personality(PER_SVR4);
 				interpreter = open_exec(elf_interpreter);
+
+				new_domain = current->exec_domain;
+				new_fs = current->fs;
 				current->personality = old_pers;
+				current->exec_domain = old_domain;
+				current->fs = old_fs;
+				put_exec_domain(new_domain);
+				put_fs_struct(new_fs);
 			} else
 #endif
 			{
@@ -668,19 +680,8 @@
 	if (interpreter_type != INTERPRETER_AOUT)
 		sys_close(elf_exec_fileno);
 
-	put_exec_domain(current->exec_domain);
-	if (current->binfmt && current->binfmt->module)
-		__MOD_DEC_USE_COUNT(current->binfmt->module);
-	current->exec_domain = lookup_exec_domain(current->personality);
-	current->binfmt = &elf_format;
-	if (current->binfmt && current->binfmt->module)
-		__MOD_INC_USE_COUNT(current->binfmt->module);
+	set_binfmt(&elf_format);
 
-#ifndef VM_STACK_FLAGS
-	lock_kernel();
-	current->executable = dget(bprm->file->f_dentry);
-	unlock_kernel();
-#endif
 	compute_creds(bprm);
 	current->flags &= ~PF_FORKNOEXEC;
 	bprm->p = (unsigned long)
@@ -962,7 +963,7 @@
 #undef DUMP_SEEK
 
 #define DUMP_WRITE(addr, nr)	\
-	if (!dump_write(file, (addr), (nr))) \
+	if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
 		goto end_coredump;
 #define DUMP_SEEK(off)	\
 	if (!dump_seek(file, (off))) \
@@ -979,8 +980,8 @@
 	int has_dumped = 0;
 	mm_segment_t fs;
 	int segs;
+	size_t size = 0;
 	int i;
-	size_t size;
 	struct vm_area_struct *vma;
 	struct elfhdr elf;
 	off_t offset = 0, dataoff;
@@ -991,24 +992,10 @@
 	elf_fpregset_t fpu;		/* NT_PRFPREG */
 	struct elf_prpsinfo psinfo;	/* NT_PRPSINFO */
 
-	/* Count what's needed to dump, up to the limit of coredump size */
-	segs = 0;
-	size = 0;
-	for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
-		if (maydump(vma))
-		{
-			unsigned long sz = vma->vm_end-vma->vm_start;
-
-			if (size+sz >= limit)
-				break;
-			else
-				size += sz;
-		}
+	segs = current->mm->map_count;
 
-		segs++;
-	}
 #ifdef DEBUG
-	printk("elf_core_dump: %d segs taking %d bytes\n", segs, size);
+	printk("elf_core_dump: %d segs %lu limit\n", segs, limit);
 #endif
 
 	/* Set up header */
@@ -1165,13 +1152,10 @@
 	dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
 
 	/* Write program headers for segments dump */
-	for(vma = current->mm->mmap, i = 0;
-		i < segs && vma != NULL; vma = vma->vm_next) {
+	for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
 		struct elf_phdr phdr;
 		size_t sz;
 
-		i++;
-
 		sz = vma->vm_end - vma->vm_start;
 
 		phdr.p_type = PT_LOAD;
@@ -1197,19 +1181,36 @@
 
 	DUMP_SEEK(dataoff);
 
-	for(i = 0, vma = current->mm->mmap;
-	    i < segs && vma != NULL;
-	    vma = vma->vm_next) {
-		unsigned long addr = vma->vm_start;
-		unsigned long len = vma->vm_end - vma->vm_start;
+	for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
+		unsigned long addr;
 
-		i++;
 		if (!maydump(vma))
 			continue;
 #ifdef DEBUG
 		printk("elf_core_dump: writing %08lx %lx\n", addr, len);
 #endif
-		DUMP_WRITE((void *)addr, len);
+		for (addr = vma->vm_start;
+		     addr < vma->vm_end;
+		     addr += PAGE_SIZE) {
+			pgd_t *pgd;
+			pmd_t *pmd;
+			pte_t *pte;
+
+			pgd = pgd_offset(vma->vm_mm, addr);
+			pmd = pmd_alloc(pgd, addr);
+	
+			if (!pmd)
+				goto end_coredump;
+			pte = pte_alloc(pmd, addr);
+			if (!pte)
+				goto end_coredump;
+			if (!pte_present(*pte) &&
+			    pte_none(*pte)) {
+				DUMP_SEEK (file->f_pos + PAGE_SIZE);
+			} else {
+				DUMP_WRITE((void*)addr, PAGE_SIZE);
+			}
+		}
 	}
 
 	if ((off_t) file->f_pos != offset) {