Re: [PATCH][RFC] introduce a mmap MAP_DONTEXPAND flag (fwd)

From: Bart Oldeman
Date: Thu Mar 11 2004 - 10:39:54 EST

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[please ignore the previous message, some were still missing]

On Thu, 18 Mar 2004, Andi Kleen wrote:

> Bart Oldeman <bartoldeman@xxxxxxxxxxxxxxxxxxxxx> writes:
>
> > return -EPERM;
> > --- include/asm-i386/mman.h~ Sat Oct 25 19:42:58 2003
> > +++ include/asm-i386/mman.h Thu Mar 11 13:37:33 2004
> > @@ -22,6 +22,7 @@
> > #define MAP_NORESERVE 0x4000 /* don't check for reservations */
> > #define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
> > #define MAP_NONBLOCK 0x10000 /* do not block on IO */
> > +#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */
>
> *always* when you change something in asm-i386 check if other architectures
> need changing too. Your patch would break compilation for everybody !i386

that's the reason for my i386 comment and the "RFC". Just asking if people
do or do not like the idea. Anyway, I've done the whole bunch now.

--- mm/mmap.c~ Wed Feb 25 19:21:10 2004
+++ mm/mmap.c Thu Mar 11 15:18:37 2004
@@ -511,6 +511,10 @@
vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) |
mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;

+ if (flags & MAP_DONTEXPAND) {
+ vm_flags |= VM_DONTEXPAND;
+ }
+
if (flags & MAP_LOCKED) {
if (!capable(CAP_IPC_LOCK))
return -EPERM;
diff -ur include_old/asm-alpha/mman.h include/asm-alpha/mman.h
--- include_old/asm-alpha/mman.h Sat Oct 25 19:42:47 2003
+++ include/asm-alpha/mman.h Thu Mar 11 15:18:37 2004
@@ -28,6 +28,7 @@
#define MAP_NORESERVE 0x10000 /* don't check for reservations */
#define MAP_POPULATE 0x20000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x40000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x80000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_SYNC 2 /* synchronous memory sync */
diff -ur include_old/asm-arm/mman.h include/asm-arm/mman.h
--- include_old/asm-arm/mman.h Sat Oct 25 19:43:19 2003
+++ include/asm-arm/mman.h Thu Mar 11 15:18:37 2004
@@ -22,6 +22,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) page tables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-arm26/mman.h include/asm-arm26/mman.h
--- include_old/asm-arm26/mman.h Sat Oct 25 19:42:49 2003
+++ include/asm-arm26/mman.h Thu Mar 11 15:18:37 2004
@@ -22,6 +22,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) page tables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-cris/mman.h include/asm-cris/mman.h
--- include_old/asm-cris/mman.h Sat Oct 25 19:44:49 2003
+++ include/asm-cris/mman.h Thu Mar 11 15:18:37 2004
@@ -24,6 +24,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-h8300/mman.h include/asm-h8300/mman.h
--- include_old/asm-h8300/mman.h Sat Oct 25 19:43:51 2003
+++ include/asm-h8300/mman.h Thu Mar 11 15:18:37 2004
@@ -19,6 +19,7 @@
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
#define MAP_LOCKED 0x2000 /* pages are locked */
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
+#define MAP_DONTEXPAND 0x8000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-i386/mman.h include/asm-i386/mman.h
--- include_old/asm-i386/mman.h Sat Oct 25 19:42:58 2003
+++ include/asm-i386/mman.h Thu Mar 11 15:25:55 2004
@@ -22,6 +22,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-ia64/mman.h include/asm-ia64/mman.h
--- include_old/asm-ia64/mman.h Wed Feb 25 19:21:01 2004
+++ include/asm-ia64/mman.h Thu Mar 11 15:18:37 2004
@@ -30,6 +30,7 @@
#define MAP_NORESERVE 0x04000 /* don't check for reservations */
#define MAP_POPULATE 0x08000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-m68k/mman.h include/asm-m68k/mman.h
--- include_old/asm-m68k/mman.h Sat Oct 25 19:43:02 2003
+++ include/asm-m68k/mman.h Thu Mar 11 15:18:37 2004
@@ -22,6 +22,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-mips/mman.h include/asm-mips/mman.h
--- include_old/asm-mips/mman.h Sat Oct 25 19:43:18 2003
+++ include/asm-mips/mman.h Thu Mar 11 15:26:06 2004
@@ -46,6 +46,7 @@
#define MAP_LOCKED 0x8000 /* pages are locked */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x40000 /* do not allow mremap to expand */

/*
* Flags for msync
diff -ur include_old/asm-parisc/mman.h include/asm-parisc/mman.h
--- include_old/asm-parisc/mman.h Sat Oct 25 19:43:56 2003
+++ include/asm-parisc/mman.h Thu Mar 11 15:27:05 2004
@@ -22,6 +22,7 @@
#define MAP_GROWSDOWN 0x8000 /* stack-like segment */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x40000 /* do not allow mremap to expand */

#define MS_SYNC 1 /* synchronous memory sync */
#define MS_ASYNC 2 /* sync memory asynchronously */
diff -ur include_old/asm-ppc/mman.h include/asm-ppc/mman.h
--- include_old/asm-ppc/mman.h Sat Oct 25 19:45:07 2003
+++ include/asm-ppc/mman.h Thu Mar 11 15:33:58 2004
@@ -23,6 +23,7 @@
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-ppc64/mman.h include/asm-ppc64/mman.h
--- include_old/asm-ppc64/mman.h Sat Oct 25 19:43:30 2003
+++ include/asm-ppc64/mman.h Thu Mar 11 15:33:31 2004
@@ -28,6 +28,7 @@
#define MAP_GROWSDOWN 0x0100 /* stack-like segment */
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
+#define MAP_DONTEXPAND 0x2000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-s390/mman.h include/asm-s390/mman.h
--- include_old/asm-s390/mman.h Sat Oct 25 19:42:53 2003
+++ include/asm-s390/mman.h Thu Mar 11 15:27:31 2004
@@ -30,6 +30,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-sh/mman.h include/asm-sh/mman.h
--- include_old/asm-sh/mman.h Sat Oct 25 19:44:35 2003
+++ include/asm-sh/mman.h Thu Mar 11 15:18:37 2004
@@ -22,6 +22,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) page tables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-sparc/mman.h include/asm-sparc/mman.h
--- include_old/asm-sparc/mman.h Sat Oct 25 19:44:48 2003
+++ include/asm-sparc/mman.h Thu Mar 11 15:18:37 2004
@@ -26,6 +26,7 @@
#define MAP_GROWSDOWN 0x0200 /* stack-like segment */
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
+#define MAP_DONTEXPAND 0x2000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-sparc64/mman.h include/asm-sparc64/mman.h
--- include_old/asm-sparc64/mman.h Sat Oct 25 19:43:36 2003
+++ include/asm-sparc64/mman.h Thu Mar 11 15:18:37 2004
@@ -26,6 +26,7 @@
#define MAP_GROWSDOWN 0x0200 /* stack-like segment */
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
+#define MAP_DONTEXPAND 0x2000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-v850/mman.h include/asm-v850/mman.h
--- include_old/asm-v850/mman.h Sat Oct 25 19:44:34 2003
+++ include/asm-v850/mman.h Thu Mar 11 15:18:37 2004
@@ -19,6 +19,7 @@
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
#define MAP_LOCKED 0x2000 /* pages are locked */
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
+#define MAP_DONTEXPAND 0x8000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
diff -ur include_old/asm-x86_64/mman.h include/asm-x86_64/mman.h
--- include_old/asm-x86_64/mman.h Sat Oct 25 19:44:05 2003
+++ include/asm-x86_64/mman.h Thu Mar 11 15:18:37 2004
@@ -23,6 +23,7 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_DONTEXPAND 0x20000 /* do not allow mremap to expand */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */

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