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x86: bpf_jit_comp: secure bpf jit against spraying attacks

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hpa bringed into my attention some security related issues
with BPF JIT on x86.

This patch makes sure the bpf generated code is marked read only,
as other kernel text sections.

It also splits the unused space (we vmalloc() and only use a fraction of
the page) in two parts, so that the generated bpf code not starts at a
known offset in the page, but a pseudo random one.

Refs:
http://mainisusuallyafunction.blogspot.com/2012/11/attacking-hardened-linux-systems-with.html

Reported-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-05-17 16:37:03 +00:00 committed by David S. Miller
parent 3e59cb0ddf
commit 314beb9bca
1 changed files with 47 additions and 6 deletions
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53
arch/x86/net/bpf_jit_comp.c
View File

@ -12,6 +12,7 @@
#include <linux/netdevice.h>
#include <linux/filter.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
/*
* Conventions :
@ -144,6 +145,39 @@ static int pkt_type_offset(void)
return -1;
}
struct bpf_binary_header {
unsigned int pages;
/* Note : for security reasons, bpf code will follow a randomly
* sized amount of int3 instructions
*/
u8 image[];
};
static struct bpf_binary_header *bpf_alloc_binary(unsigned int proglen,
u8 **image_ptr)
{
unsigned int sz, hole;
struct bpf_binary_header *header;
/* Most of BPF filters are really small,
* but if some of them fill a page, allow at least
* 128 extra bytes to insert a random section of int3
*/
sz = round_up(proglen + sizeof(*header) + 128, PAGE_SIZE);
header = module_alloc(sz);
if (!header)
return NULL;
memset(header, 0xcc, sz); /* fill whole space with int3 instructions */
header->pages = sz / PAGE_SIZE;
hole = sz - (proglen + sizeof(*header));
/* insert a random number of int3 instructions before BPF code */
*image_ptr = &header->image[prandom_u32() % hole];
return header;
}
void bpf_jit_compile(struct sk_filter *fp)
{
u8 temp[64];
@ -153,6 +187,7 @@ void bpf_jit_compile(struct sk_filter *fp)
int t_offset, f_offset;
u8 t_op, f_op, seen = 0, pass;
u8 *image = NULL;
struct bpf_binary_header *header = NULL;
u8 *func;
int pc_ret0 = -1; /* bpf index of first RET #0 instruction (if any) */
unsigned int cleanup_addr; /* epilogue code offset */
@ -693,7 +728,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];
if (unlikely(proglen + ilen > oldproglen)) {
pr_err("bpb_jit_compile fatal error\n");
kfree(addrs);
module_free(NULL, image);
module_free(NULL, header);
return;
}
memcpy(image + proglen, temp, ilen);
@ -717,8 +752,8 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];
break;
}
if (proglen == oldproglen) {
image = module_alloc(proglen);
if (!image)
header = bpf_alloc_binary(proglen, &image);
if (!header)
goto out;
}
oldproglen = proglen;
@ -728,7 +763,8 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];
bpf_jit_dump(flen, proglen, pass, image);
if (image) {
bpf_flush_icache(image, image + proglen);
bpf_flush_icache(header, image + proglen);
set_memory_ro((unsigned long)header, header->pages);
fp->bpf_func = (void *)image;
}
out:
@ -738,6 +774,11 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];
void bpf_jit_free(struct sk_filter *fp)
{
if (fp->bpf_func != sk_run_filter)
module_free(NULL, fp->bpf_func);
if (fp->bpf_func != sk_run_filter) {
unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
struct bpf_binary_header *header = (void *)addr;
set_memory_rw(addr, header->pages);
module_free(NULL, header);
}
}