svn commit: r197932 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Sat Oct 10 15:28:52 2009
New Revision: 197932
URL: http://svn.freebsd.org/changeset/base/197932

Log:
  Do not map segments of zero length.
  
  Discussed with:	bz
  Reviewed by:	kan
  Tested by:	bz (i386, amd64), bsam (linux)
  MFC after:	some time

Modified:
  head/sys/kern/imgact_elf.c

Modified: head/sys/kern/imgact_elf.c
==============================================================================
--- head/sys/kern/imgact_elf.c	Sat Oct 10 15:27:10 2009	(r197931)
+++ head/sys/kern/imgact_elf.c	Sat Oct 10 15:28:52 2009	(r197932)
@@ -635,7 +635,8 @@ __elfN(load_file)(struct proc *p, const 
 	}
 
 	for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
-		if (phdr[i].p_type == PT_LOAD) {	/* Loadable segment */
+		if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
+			/* Loadable segment */
 			prot = 0;
 			if (phdr[i].p_flags & PF_X)
   				prot |= VM_PROT_EXECUTE;
@@ -764,6 +765,8 @@ __CONCAT(exec_, __elfN(imgact))(struct i
 	for (i = 0; i < hdr->e_phnum; i++) {
 		switch (phdr[i].p_type) {
 		case PT_LOAD:	/* Loadable segment */
+			if (phdr[i].p_memsz == 0)
+				break;
 			prot = 0;
 			if (phdr[i].p_flags & PF_X)
   				prot |= VM_PROT_EXECUTE;