svn commit: r343843 - head/sys/riscv/riscv

[Ed Maste]

Author: emaste
Date: Wed Feb  6 19:22:15 2019
New Revision: 343843
URL: https://svnweb.freebsd.org/changeset/base/343843

Log:
  riscv: default to non-executable stack
  
  There's no need to worry about potential backwards compatibility issues
  in a brand-new architecture, so avoid stack PROT_EXEC as with arm64.
  
  Discussed with:	br

Modified:
  head/sys/riscv/riscv/elf_machdep.c

Modified: head/sys/riscv/riscv/elf_machdep.c
==============================================================================
--- head/sys/riscv/riscv/elf_machdep.c	Wed Feb  6 18:50:48 2019	(r343842)
+++ head/sys/riscv/riscv/elf_machdep.c	Wed Feb  6 19:22:15 2019	(r343843)
@@ -77,7 +77,7 @@ struct sysentvec elf64_freebsd_sysvec = {
 	.sv_maxuser	= VM_MAXUSER_ADDRESS,
 	.sv_usrstack	= USRSTACK,
 	.sv_psstrings	= PS_STRINGS,
-	.sv_stackprot	= VM_PROT_ALL,
+	.sv_stackprot	= VM_PROT_READ | VM_PROT_WRITE,
 	.sv_copyout_strings	= exec_copyout_strings,
 	.sv_setregs	= exec_setregs,
 	.sv_fixlimit	= NULL,