diff -urN clean/arch/mips/kernel/irixelf.c linux-2.6.5-SLES9_SP1_BRANCH_91/arch/mips/kernel/irixelf.c
--- clean/arch/mips/kernel/irixelf.c	2005-01-09 12:25:26.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/arch/mips/kernel/irixelf.c	2005-01-19 19:29:59.909824951 -0500
@@ -128,7 +128,7 @@
 	end = PAGE_ALIGN(end);
 	if (end <= start)
 		return;
-	do_brk(start, end - start);
+	do_brk_locked(start, end - start);
 }
 
 
diff -urN clean/arch/x86_64/ia32/ia32_aout.c linux-2.6.5-SLES9_SP1_BRANCH_91/arch/x86_64/ia32/ia32_aout.c
--- clean/arch/x86_64/ia32/ia32_aout.c	2005-01-09 12:25:33.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/arch/x86_64/ia32/ia32_aout.c	2005-01-19 19:30:50.255145196 -0500
@@ -114,7 +114,7 @@
 	start = PAGE_ALIGN(start);
 	end = PAGE_ALIGN(end);
 	if (end > start) {
-		unsigned long addr = do_brk(start, end - start);
+		unsigned long addr = do_brk_locked(start, end - start);
 		if (BAD_ADDR(addr))
 			return addr;
 	}
@@ -327,7 +327,7 @@
 		pos = 32;
 		map_size = ex.a_text+ex.a_data;
 
-		error = do_brk(text_addr & PAGE_MASK, map_size);
+		error = do_brk_locked(text_addr & PAGE_MASK, map_size);
 		if (error != (text_addr & PAGE_MASK)) {
 			send_sig(SIGKILL, current, 0);
 			return error;
@@ -363,7 +363,7 @@
 
 		if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
 			loff_t pos = fd_offset;
-			do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+			do_brk_locked(N_TXTADDR(ex), ex.a_text+ex.a_data);
 			bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex),
 					ex.a_text+ex.a_data, &pos);
 			flush_icache_range((unsigned long) N_TXTADDR(ex),
@@ -476,7 +476,7 @@
 		}
 #endif
 
-		do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+		do_brk_locked(start_addr, ex.a_text + ex.a_data + ex.a_bss);
 		
 		file->f_op->read(file, (char *)start_addr,
 			ex.a_text + ex.a_data, &pos);
@@ -500,7 +500,7 @@
 	len = PAGE_ALIGN(ex.a_text + ex.a_data);
 	bss = ex.a_text + ex.a_data + ex.a_bss;
 	if (bss > len) {
-		error = do_brk(start_addr + len, bss - len);
+		error = do_brk_locked(start_addr + len, bss - len);
 		retval = error;
 		if (error != start_addr + len)
 			goto out;
diff -urN clean/fs/binfmt_aout.c linux-2.6.5-SLES9_SP1_BRANCH_91/fs/binfmt_aout.c
--- clean/fs/binfmt_aout.c	2005-01-09 12:25:33.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/fs/binfmt_aout.c	2005-01-19 19:31:40.480490745 -0500
@@ -51,7 +51,7 @@
 	start = PAGE_ALIGN(start);
 	end = PAGE_ALIGN(end);
 	if (end > start) {
-		unsigned long addr = do_brk(start, end - start);
+		unsigned long addr = do_brk_locked(start, end - start);
 		if (BAD_ADDR(addr))
 			return addr;
 	}
@@ -323,10 +323,10 @@
 		loff_t pos = fd_offset;
 		/* Fuck me plenty... */
 		/* <AOL></AOL> */
-		error = do_brk(N_TXTADDR(ex), ex.a_text);
+		error = do_brk_locked(N_TXTADDR(ex), ex.a_text);
 		bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
 			  ex.a_text, &pos);
-		error = do_brk(N_DATADDR(ex), ex.a_data);
+		error = do_brk_locked(N_DATADDR(ex), ex.a_data);
 		bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
 			  ex.a_data, &pos);
 		goto beyond_if;
@@ -347,7 +347,7 @@
 		map_size = ex.a_text+ex.a_data;
 #endif
 
-		error = do_brk(text_addr & PAGE_MASK, map_size);
+		error = do_brk_locked(text_addr & PAGE_MASK, map_size);
 		if (error != (text_addr & PAGE_MASK)) {
 			send_sig(SIGKILL, current, 0);
 			return error;
@@ -381,7 +381,7 @@
 
 		if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
 			loff_t pos = fd_offset;
-			do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+			do_brk_locked(N_TXTADDR(ex), ex.a_text+ex.a_data);
 			bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex),
 					ex.a_text+ex.a_data, &pos);
 			flush_icache_range((unsigned long) N_TXTADDR(ex),
@@ -486,7 +486,7 @@
 			error_time = jiffies;
 		}
 
-		do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+		do_brk_locked(start_addr, ex.a_text + ex.a_data + ex.a_bss);
 		
 		file->f_op->read(file, (char *)start_addr,
 			ex.a_text + ex.a_data, &pos);
@@ -510,7 +510,7 @@
 	len = PAGE_ALIGN(ex.a_text + ex.a_data);
 	bss = ex.a_text + ex.a_data + ex.a_bss;
 	if (bss > len) {
-		error = do_brk(start_addr + len, bss - len);
+		error = do_brk_locked(start_addr + len, bss - len);
 		retval = error;
 		if (error != start_addr + len)
 			goto out;
diff -urN clean/fs/binfmt_elf.c linux-2.6.5-SLES9_SP1_BRANCH_91/fs/binfmt_elf.c
--- clean/fs/binfmt_elf.c	2005-01-09 12:25:33.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/fs/binfmt_elf.c	2005-01-19 19:29:59.914823791 -0500
@@ -88,7 +88,7 @@
 	start = ELF_PAGEALIGN(start);
 	end = ELF_PAGEALIGN(end);
 	if (end > start) {
-		unsigned long addr = do_brk(start, end - start);
+		unsigned long addr = do_brk_locked(start, end - start);
 		if (BAD_ADDR(addr))
 			return addr;
 	}
@@ -406,7 +406,7 @@
 
 	/* Map the last of the bss segment */
 	if (last_bss > elf_bss) {
-		error = do_brk(elf_bss, last_bss - elf_bss);
+		error = do_brk_locked(elf_bss, last_bss - elf_bss);
 		if (BAD_ADDR(error))
 			goto out_close;
 	}
@@ -446,7 +446,7 @@
 		goto out;
 	}
 
-	do_brk(0, text_data);
+	do_brk_locked(0, text_data);
 	if (!interpreter->f_op || !interpreter->f_op->read)
 		goto out;
 	if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
@@ -454,7 +454,7 @@
 	flush_icache_range((unsigned long)addr,
 	                   (unsigned long)addr + text_data);
 
-	do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
+	do_brk_locked(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
 		interp_ex->a_bss);
 	elf_entry = interp_ex->a_entry;
 
@@ -1006,7 +1006,7 @@
 	len = ELF_PAGESTART(elf_phdata->p_filesz + elf_phdata->p_vaddr + ELF_MIN_ALIGN - 1);
 	bss = elf_phdata->p_memsz + elf_phdata->p_vaddr;
 	if (bss > len)
-		do_brk(len, bss - len);
+		do_brk_locked(len, bss - len);
 	error = 0;
 
 out_free_ph:
diff -urN clean/include/linux/mm.h linux-2.6.5-SLES9_SP1_BRANCH_91/include/linux/mm.h
--- clean/include/linux/mm.h	2005-01-09 12:25:34.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/include/linux/mm.h	2005-01-19 19:29:59.915823559 -0500
@@ -821,6 +821,7 @@
 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
 
 extern unsigned long do_brk(unsigned long, unsigned long);
+extern unsigned long do_brk_locked(unsigned long, unsigned long);
 
 /* vma merging helpers */
 static inline void
diff -urN clean/mm/mmap.c linux-2.6.5-SLES9_SP1_BRANCH_91/mm/mmap.c
--- clean/mm/mmap.c	2005-01-09 12:25:34.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/mm/mmap.c	2005-01-19 19:29:59.917823095 -0500
@@ -1658,6 +1658,20 @@
 
 EXPORT_SYMBOL(do_brk);
 
+/* locking version of do_brk. */
+unsigned long do_brk_locked(unsigned long addr, unsigned long len)
+{
+	unsigned long ret;
+
+	down_write(&current->mm->mmap_sem);
+	ret = do_brk(addr, len);
+	up_write(&current->mm->mmap_sem);
+
+	return ret;
+}
+
+EXPORT_SYMBOL(do_brk_locked);
+
 /* Release all mmaps. */
 void exit_mmap(struct mm_struct *mm)
 {
diff -urN clean/mm/nommu.c linux-2.6.5-SLES9_SP1_BRANCH_91/mm/nommu.c
--- clean/mm/nommu.c	2005-01-09 12:25:27.000000000 -0500
+++ linux-2.6.5-SLES9_SP1_BRANCH_91/mm/nommu.c	2005-01-19 19:29:59.918822864 -0500
@@ -227,6 +227,11 @@
 	return audit_lresult(mm->brk = brk);
 }
 
+unsigned long do_brk_locked(unsigned long addr, unsigned long len)
+{
+	return -ENOMEM;
+}
+
 /*
  * Combine the mmap "prot" and "flags" argument into one "vm_flags" used
  * internally. Essentially, translate the "PROT_xxx" and "MAP_xxx" bits