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linux
linux-davinci
Commits
05f9ca83
Commit
05f9ca83
authored
Mar 17, 2006
by
David S. Miller
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[SPARC64]: Randomize mm->mmap_base when PF_RANDOMIZE is set.
Signed-off-by:
David S. Miller
<
davem@davemloft.net
>
parent
d61e16df
Changes
1
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1 changed file
with
14 additions
and
2 deletions
+14
-2
arch/sparc64/kernel/sys_sparc.c
arch/sparc64/kernel/sys_sparc.c
+14
-2
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arch/sparc64/kernel/sys_sparc.c
View file @
05f9ca83
...
...
@@ -25,6 +25,7 @@
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <linux/personality.h>
#include <linux/random.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>
...
...
@@ -358,6 +359,17 @@ unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, u
/* Essentially the same as PowerPC... */
void
arch_pick_mmap_layout
(
struct
mm_struct
*
mm
)
{
unsigned
long
random_factor
=
0UL
;
if
(
current
->
flags
&
PF_RANDOMIZE
)
{
random_factor
=
get_random_int
();
if
(
test_thread_flag
(
TIF_32BIT
))
random_factor
&=
((
1
*
1024
*
1024
)
-
1
);
else
random_factor
=
((
random_factor
<<
PAGE_SHIFT
)
&
0xffffffffUL
);
}
/*
* Fall back to the standard layout if the personality
* bit is set, or if the expected stack growth is unlimited:
...
...
@@ -366,7 +378,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
(
current
->
personality
&
ADDR_COMPAT_LAYOUT
)
||
current
->
signal
->
rlim
[
RLIMIT_STACK
].
rlim_cur
==
RLIM_INFINITY
||
sysctl_legacy_va_layout
)
{
mm
->
mmap_base
=
TASK_UNMAPPED_BASE
;
mm
->
mmap_base
=
TASK_UNMAPPED_BASE
+
random_factor
;
mm
->
get_unmapped_area
=
arch_get_unmapped_area
;
mm
->
unmap_area
=
arch_unmap_area
;
}
else
{
...
...
@@ -380,7 +392,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
if
(
gap
>
(
task_size
/
6
*
5
))
gap
=
(
task_size
/
6
*
5
);
mm
->
mmap_base
=
task_size
-
(
gap
&
PAGE_MASK
);
mm
->
mmap_base
=
PAGE_ALIGN
(
task_size
-
gap
-
random_factor
);
mm
->
get_unmapped_area
=
arch_get_unmapped_area_topdown
;
mm
->
unmap_area
=
arch_unmap_area_topdown
;
}
...
...
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