Add sysentvec->sv_fixlimits() hook so that we can catch cases on 64 bit

systems where the data/stack/etc limits are too big for a 32 bit process.

Move the 5 or so identical instances of ELF_RTLD_ADDR() into imgact_elf.c.

Supply an ia32_fixlimits function.  Export the clip/default values to
sysctl under the compat.ia32 heirarchy.

Have mmap(0, ...) respect the current p->p_limits[RLIMIT_DATA].rlim_max
value rather than the sysctl tweakable variable.  This allows mmap to
place mappings at sensible locations when limits have been reduced.

Have the imgact_elf.c ld-elf.so.1 placement algorithm use the same
method as mmap(0, ...) now does.

Note that we cannot remove all references to the sysctl tweakable
maxdsiz etc variables because /etc/login.conf specifies a datasize
of 'unlimited'.  And that causes exec etc to fail since it can no
longer find space to mmap things.

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/compat/ia32/ia32_util.h b/sys/compat/ia32/ia32_util.h
index 06f78cf..f6de375 100644
--- a/sys/compat/ia32/ia32_util.h
+++ b/sys/compat/ia32/ia32_util.h
@@ -38,3 +38,7 @@
 #include <sys/cdefs.h>
 
 #define FREEBSD32_USRSTACK	((1ul << 32) - PAGE_SIZE)
+
+#define	IA32_MAXDSIZ	(512*1024*1024)		/* 512MB */
+#define	IA32_MAXSSIZ	(64*1024*1024)		/* 64MB */
+#define IA32_MAXVMEM	0			/* Unlimited */