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SubjectRe: 2.6.5-rc1-aa1
Date
On Saturday 20 March 2004 17:31, Andrea Arcangeli wrote:

Hi Andrea,

> > It's in the RHEL3 kernel, a patch named linux-2.4.21-mlock.patch.
> could somebody submit it to me too? ;) otherwise I'll have to search for
> some big rpm.

there you go.

ciao, Marc
diff -urNp linux-1040/include/asm-alpha/resource.h linux-1050/include/asm-alpha/resource.h
--- linux-1040/include/asm-alpha/resource.h 2000-09-27 16:39:23.000000000 -0400
+++ linux-1050/include/asm-alpha/resource.h
@@ -39,7 +39,7 @@
{INR_OPEN, INR_OPEN}, /* RLIMIT_NOFILE */ \
{LONG_MAX, LONG_MAX}, /* RLIMIT_AS */ \
{LONG_MAX, LONG_MAX}, /* RLIMIT_NPROC */ \
- {LONG_MAX, LONG_MAX}, /* RLIMIT_MEMLOCK */ \
+ {PAGE_SIZE,PAGE_SIZE}, /* RLIMIT_MEMLOCK */ \
{LONG_MAX, LONG_MAX}, /* RLIMIT_LOCKS */ \
}

diff -urNp linux-1040/include/asm-arm/resource.h linux-1050/include/asm-arm/resource.h
--- linux-1040/include/asm-arm/resource.h 2000-09-22 17:21:19.000000000 -0400
+++ linux-1050/include/asm-arm/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-cris/resource.h linux-1050/include/asm-cris/resource.h
--- linux-1040/include/asm-cris/resource.h 2001-02-08 19:32:44.000000000 -0500
+++ linux-1050/include/asm-cris/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-i386/resource.h linux-1050/include/asm-i386/resource.h
--- linux-1040/include/asm-i386/resource.h 2000-09-22 17:21:19.000000000 -0400
+++ linux-1050/include/asm-i386/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-ia64/resource.h linux-1050/include/asm-ia64/resource.h
--- linux-1040/include/asm-ia64/resource.h 2000-09-22 17:21:19.000000000 -0400
+++ linux-1050/include/asm-ia64/resource.h
@@ -40,7 +40,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-m68k/resource.h linux-1050/include/asm-m68k/resource.h
--- linux-1040/include/asm-m68k/resource.h
+++ linux-1050/include/asm-m68k/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-mips/resource.h linux-1050/include/asm-mips/resource.h
--- linux-1040/include/asm-mips/resource.h 2001-07-02 16:56:40.000000000 -0400
+++ linux-1050/include/asm-mips/resource.h
@@ -44,7 +44,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}

diff -urNp linux-1040/include/asm-mips64/resource.h linux-1050/include/asm-mips64/resource.h
--- linux-1040/include/asm-mips64/resource.h 2001-09-09 13:43:02.000000000 -0400
+++ linux-1050/include/asm-mips64/resource.h
@@ -45,7 +45,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}

diff -urNp linux-1040/include/asm-parisc/resource.h linux-1050/include/asm-parisc/resource.h
--- linux-1040/include/asm-parisc/resource.h 2000-12-05 15:29:39.000000000 -0500
+++ linux-1050/include/asm-parisc/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-ppc/resource.h linux-1050/include/asm-ppc/resource.h
--- linux-1040/include/asm-ppc/resource.h
+++ linux-1050/include/asm-ppc/resource.h
@@ -34,7 +34,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-ppc64/mman.h linux-1050/include/asm-ppc64/mman.h
--- linux-1040/include/asm-ppc64/mman.h
+++ linux-1050/include/asm-ppc64/mman.h
@@ -20,6 +20,7 @@
#define MAP_ANONYMOUS 0x20 /* don't use a file */
#define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */
#define MAP_NORESERVE 0x40 /* don't reserve swap pages */
+#define MAP_LOCKED 0x80

#define MAP_GROWSDOWN 0x0100 /* stack-like segment */
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
diff -urNp linux-1040/include/asm-ppc64/resource.h linux-1050/include/asm-ppc64/resource.h
--- linux-1040/include/asm-ppc64/resource.h
+++ linux-1050/include/asm-ppc64/resource.h
@@ -43,7 +43,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-s390/resource.h linux-1050/include/asm-s390/resource.h
--- linux-1040/include/asm-s390/resource.h 2001-02-13 17:13:44.000000000 -0500
+++ linux-1050/include/asm-s390/resource.h
@@ -45,7 +45,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-s390x/resource.h linux-1050/include/asm-s390x/resource.h
--- linux-1040/include/asm-s390x/resource.h 2001-02-13 17:13:44.000000000 -0500
+++ linux-1050/include/asm-s390x/resource.h
@@ -45,7 +45,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-sh/resource.h linux-1050/include/asm-sh/resource.h
--- linux-1040/include/asm-sh/resource.h 2000-09-22 17:21:21.000000000 -0400
+++ linux-1050/include/asm-sh/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/asm-sparc/resource.h linux-1050/include/asm-sparc/resource.h
--- linux-1040/include/asm-sparc/resource.h 2000-10-10 13:33:52.000000000 -0400
+++ linux-1050/include/asm-sparc/resource.h
@@ -42,7 +42,7 @@
{ 0, RLIM_INFINITY}, \
{RLIM_INFINITY, RLIM_INFINITY}, \
{INR_OPEN, INR_OPEN}, {0, 0}, \
- {RLIM_INFINITY, RLIM_INFINITY}, \
+ {PAGE_SIZE, PAGE_SIZE }, \
{RLIM_INFINITY, RLIM_INFINITY}, \
{RLIM_INFINITY, RLIM_INFINITY} \
}
diff -urNp linux-1040/include/asm-sparc64/resource.h linux-1050/include/asm-sparc64/resource.h
--- linux-1040/include/asm-sparc64/resource.h 2000-10-10 13:33:52.000000000 -0400
+++ linux-1050/include/asm-sparc64/resource.h
@@ -41,7 +41,7 @@
{ 0, RLIM_INFINITY}, \
{RLIM_INFINITY, RLIM_INFINITY}, \
{INR_OPEN, INR_OPEN}, {0, 0}, \
- {RLIM_INFINITY, RLIM_INFINITY}, \
+ {PAGE_SIZE, PAGE_SIZE }, \
{RLIM_INFINITY, RLIM_INFINITY}, \
{RLIM_INFINITY, RLIM_INFINITY} \
}
diff -urNp linux-1040/include/asm-x86_64/resource.h linux-1050/include/asm-x86_64/resource.h
--- linux-1040/include/asm-x86_64/resource.h
+++ linux-1050/include/asm-x86_64/resource.h
@@ -37,7 +37,7 @@
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ 0, 0 }, \
{ INR_OPEN, INR_OPEN }, \
- { RLIM_INFINITY, RLIM_INFINITY }, \
+ { PAGE_SIZE, PAGE_SIZE }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
{ RLIM_INFINITY, RLIM_INFINITY }, \
}
diff -urNp linux-1040/include/linux/mm.h linux-1050/include/linux/mm.h
--- linux-1040/include/linux/mm.h
+++ linux-1050/include/linux/mm.h
@@ -597,7 +597,7 @@ extern void clear_page_tables(struct mm_
extern int fail_writepage(struct page *);
struct page * shmem_nopage(struct vm_area_struct * vma, unsigned long address, int unused);
struct file *shmem_file_setup(char * name, loff_t size);
-extern void shmem_lock(struct file * file, int lock);
+extern int shmem_lock(struct file * file, int lock);
extern int shmem_zero_setup(struct vm_area_struct *);

extern void zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size);
@@ -701,6 +701,17 @@ static inline int can_vma_merge(struct v
return 0;
}

+/* mlock can just return an instant EPERM if the caller has no
+ permission to do any memory locking. */
+static inline int can_do_mlock(void)
+{
+ if (capable(CAP_IPC_LOCK))
+ return 1;
+ if (current->rlim[RLIMIT_MEMLOCK].rlim_cur != 0)
+ return 1;
+ return 0;
+}
+
struct zone_t;
/* filemap.c */
extern void remove_inode_page(struct page *);
diff -urNp linux-1040/ipc/shm.c linux-1050/ipc/shm.c
--- linux-1040/ipc/shm.c
+++ linux-1050/ipc/shm.c
@@ -457,12 +457,9 @@ asmlinkage long sys_shmctl (int shmid, i
case SHM_LOCK:
case SHM_UNLOCK:
{
-/* Allow superuser to lock segment in memory */
-/* Should the pages be faulted in here or leave it to user? */
-/* need to determine interaction with current->swappable */
- if (!capable(CAP_IPC_LOCK))
+ /* Allow superuser to lock segment in memory */
+ if (!can_do_mlock())
return -EPERM;
-
shp = shm_lock(shmid);
if(shp==NULL)
return -EINVAL;
@@ -470,8 +467,9 @@ asmlinkage long sys_shmctl (int shmid, i
if(err)
goto out_unlock;
if(cmd==SHM_LOCK) {
- shmem_lock(shp->shm_file, 1);
- shp->shm_flags |= SHM_LOCKED;
+ err = shmem_lock(shp->shm_file, 1);
+ if (!err)
+ shp->shm_flags |= SHM_LOCKED;
} else {
shmem_lock(shp->shm_file, 0);
shp->shm_flags &= ~SHM_LOCKED;
diff -urNp linux-1040/mm/mlock.c linux-1050/mm/mlock.c
--- linux-1040/mm/mlock.c
+++ linux-1050/mm/mlock.c
@@ -151,7 +151,7 @@ static int do_mlock(unsigned long start,
struct vm_area_struct * vma, * next;
int error;

- if (on && !capable(CAP_IPC_LOCK))
+ if (on && !can_do_mlock())
return -EPERM;
len = PAGE_ALIGN(len);
end = start + len;
@@ -210,12 +210,12 @@ asmlinkage long sys_mlock(unsigned long
lock_limit >>= PAGE_SHIFT;

/* check against resource limits */
- if (locked > lock_limit)
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
goto out;

- /* we may lock at most half of physical memory... */
+ /* we may lock at most 90% of physical memory... */
/* (this check is pretty bogus, but doesn't hurt) */
- if (locked > num_physpages/2)
+ if (locked > num_physpages/10*9)
goto out;

error = do_mlock(start, len, 1);
@@ -245,7 +245,7 @@ static int do_mlockall(int flags)
unsigned int def_flags;
struct vm_area_struct * vma;

- if (!capable(CAP_IPC_LOCK))
+ if (!can_do_mlock())
return -EPERM;

def_flags = 0;
@@ -282,12 +282,12 @@ asmlinkage long sys_mlockall(int flags)
lock_limit >>= PAGE_SHIFT;

ret = -ENOMEM;
- if (current->mm->total_vm > lock_limit)
+ if (current->mm->total_vm > lock_limit && !capable(CAP_IPC_LOCK))
goto out;

- /* we may lock at most half of physical memory... */
+ /* we may lock at most 90% of physical memory... */
/* (this check is pretty bogus, but doesn't hurt) */
- if (current->mm->total_vm > num_physpages/2)
+ if (current->mm->total_vm > num_physpages/10*9)
goto out;

ret = do_mlockall(flags);
diff -urNp linux-1040/mm/mmap.c linux-1050/mm/mmap.c
--- linux-1040/mm/mmap.c
+++ linux-1050/mm/mmap.c
@@ -518,11 +518,16 @@ unsigned long do_mmap_pgoff(struct file
*/
vm_flags = calc_vm_flags(prot,flags) | mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;

+ if (flags & MAP_LOCKED)
+ vm_flags |= VM_LOCKED;
+
/* mlock MCL_FUTURE? */
if (vm_flags & VM_LOCKED) {
- unsigned long locked = mm->locked_vm << PAGE_SHIFT;
+ unsigned long locked, lock_limit;
+ locked = mm->locked_vm << PAGE_SHIFT;
+ lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur;
locked += len;
- if (locked > current->rlim[RLIMIT_MEMLOCK].rlim_cur)
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
return -EAGAIN;
}

@@ -1261,9 +1266,11 @@ unsigned long do_brk(unsigned long addr,
* mlock MCL_FUTURE?
*/
if (mm->def_flags & VM_LOCKED) {
- unsigned long locked = mm->locked_vm << PAGE_SHIFT;
+ unsigned long locked, lock_limit;
+ locked = mm->locked_vm << PAGE_SHIFT;
+ lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur;
locked += len;
- if (locked > current->rlim[RLIMIT_MEMLOCK].rlim_cur)
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
return -EAGAIN;
}

diff -urNp linux-1040/mm/mremap.c linux-1050/mm/mremap.c
--- linux-1040/mm/mremap.c
+++ linux-1050/mm/mremap.c
@@ -345,10 +345,12 @@ unsigned long do_mremap(unsigned long ad
goto out;
}
if (vma->vm_flags & VM_LOCKED) {
- unsigned long locked = current->mm->locked_vm << PAGE_SHIFT;
+ unsigned long locked, lock_limit;
+ locked = current->mm->locked_vm << PAGE_SHIFT;
+ lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur;
locked += new_len - old_len;
ret = -EAGAIN;
- if (locked > current->rlim[RLIMIT_MEMLOCK].rlim_cur)
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
goto out;
}
ret = -ENOMEM;
diff -urNp linux-1040/mm/shmem.c linux-1050/mm/shmem.c
--- linux-1040/mm/shmem.c
+++ linux-1050/mm/shmem.c
@@ -709,14 +709,35 @@ struct page * shmem_nopage(struct vm_are
return(page);
}

-void shmem_lock(struct file * file, int lock)
+int shmem_lock(struct file * file, int lock)
{
struct inode * inode = file->f_dentry->d_inode;
struct shmem_inode_info * info = SHMEM_I(inode);
+ struct mm_struct *mm = current->mm;
+ unsigned long lock_limit, locked;
+ int retval = -ENOMEM;

spin_lock(&info->lock);
+ if (lock && !info->locked) {
+ locked = inode->i_size >> PAGE_SHIFT;
+ locked += mm->locked_vm;
+ lock_limit = current->rlim[RLIMIT_MEMLOCK].rlim_cur;
+ lock_limit >>= PAGE_SHIFT;
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
+ goto out_nomem;
+ if (locked > num_physpages/10*9)
+ goto out_nomem;
+ mm->locked_vm = locked;
+ }
+ if (!lock && info->locked && mm) {
+ locked = inode->i_size >> PAGE_SHIFT;
+ mm->locked_vm -= locked;
+ }
info->locked = lock;
+ retval = 0;
+out_nomem:
spin_unlock(&info->lock);
+ return retval;
}

static int shmem_mmap(struct file * file, struct vm_area_struct * vma)
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