diff options
| author | dyson <dyson@FreeBSD.org> | 1996-12-30 05:31:21 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-12-30 05:31:21 +0000 |
| commit | c232302d3fb7bc2db6053e608cf8843199fea7c1 (patch) | |
| tree | 897f659fee68ca11a992ee3be71d600f4e9207dc /sys/i386 | |
| parent | a61ba0575d63937c042107bda370e8c8590d6120 (diff) | |
| download | FreeBSD-src-c232302d3fb7bc2db6053e608cf8843199fea7c1.zip FreeBSD-src-c232302d3fb7bc2db6053e608cf8843199fea7c1.tar.gz | |
Let the VM system know that on certain arch's that VM_PROT_READ
also implies VM_PROT_EXEC. We support it that way for now,
since the break system call by default gives VM_PROT_ALL. Now
we have a better chance of coalesing map entries when mixing
mmap/break type operations. This was contributing to excessive
numbers of map entries on the modula-3 runtime system. The
problem is still not "solved", but the situation makes more
sense.
Eventually, when we work on architectures where VM_PROT_READ
is orthogonal to VM_PROT_EXEC, we will have to visit this
issue carefully (esp. regarding security issues.)
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/include/vmparam.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h index 48b570d..5c3774e 100644 --- a/sys/i386/include/vmparam.h +++ b/sys/i386/include/vmparam.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 - * $Id: vmparam.h,v 1.20 1996/04/30 12:02:12 phk Exp $ + * $Id: vmparam.h,v 1.21 1996/05/02 14:20:07 phk Exp $ */ @@ -47,6 +47,8 @@ * Machine dependent constants for 386. */ +#define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */ + /* * Virtual memory related constants, all in bytes */ |
