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parisc: Enable KASLR

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Add missing code for userspace executable address randomization, e.g.
applications compiled with the gcc -pie option.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2016-10-16 00:02:27 +02:00
parent 69973b8308
commit 18d98a7938
4 changed files with 14 additions and 18 deletions
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1
arch/parisc/Kconfig
View File

@ -7,6 +7,7 @@ config PARISC
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_SYSCALL_TRACEPOINTS
select ARCH_WANT_FRAME_POINTERS
select ARCH_HAS_ELF_RANDOMIZE
select RTC_CLASS
select RTC_DRV_GENERIC
select INIT_ALL_POSSIBLE

7
arch/parisc/include/asm/elf.h
View File

@ -348,9 +348,10 @@ struct pt_regs; /* forward declaration... */
#define ELF_HWCAP 0
#define STACK_RND_MASK (is_32bit_task() ? \
0x7ff >> (PAGE_SHIFT - 12) : \
0x3ffff >> (PAGE_SHIFT - 12))
/* Masks for stack and mmap randomization */
#define BRK_RND_MASK (is_32bit_task() ? 0x07ffUL : 0x3ffffUL)
#define MMAP_RND_MASK (is_32bit_task() ? 0x1fffUL : 0x3ffffUL)
#define STACK_RND_MASK MMAP_RND_MASK
struct mm_struct;
extern unsigned long arch_randomize_brk(struct mm_struct *);

6
arch/parisc/kernel/process.c
View File

@ -276,11 +276,7 @@ void *dereference_function_descriptor(void *ptr)
static inline unsigned long brk_rnd(void)
{
/* 8MB for 32bit, 1GB for 64bit */
if (is_32bit_task())
return (get_random_int() & 0x7ffUL) << PAGE_SHIFT;
else
return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT;
return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
}
unsigned long arch_randomize_brk(struct mm_struct *mm)

18
arch/parisc/kernel/sys_parisc.c
View File

@ -225,19 +225,17 @@ static unsigned long mmap_rnd(void)
{
unsigned long rnd = 0;
/*
* 8 bits of randomness in 32bit mmaps, 20 address space bits
* 28 bits of randomness in 64bit mmaps, 40 address space bits
*/
if (current->flags & PF_RANDOMIZE) {
if (is_32bit_task())
rnd = get_random_int() % (1<<8);
else
rnd = get_random_int() % (1<<28);
}
if (current->flags & PF_RANDOMIZE)
rnd = get_random_int() & MMAP_RND_MASK;
return rnd << PAGE_SHIFT;
}
unsigned long arch_mmap_rnd(void)
{
return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
}
static unsigned long mmap_legacy_base(void)
{
return TASK_UNMAPPED_BASE + mmap_rnd();