net: filter: s390: fix JIT address randomization
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 14 May 2014 07:48:21 +0000 (09:48 +0200)
committerDavid S. Miller <davem@davemloft.net>
Wed, 14 May 2014 20:10:16 +0000 (16:10 -0400)
commite84d2f8d2ae33c8215429824e1ecf24cbca9645e
treed57e9fdad41fb1060dfb3a58cbb1cc1c5786df29
parentf5738e2ef88070ef1372e6e718124d88e9abe4ac
net: filter: s390: fix JIT address randomization

This is the s390 variant of Alexei's JIT bug fix.
(patch description below stolen from Alexei's patch)

bpf_alloc_binary() adds 128 bytes of room to JITed program image
and rounds it up to the nearest page size. If image size is close
to page size (like 4000), it is rounded to two pages:
round_up(4000 + 4 + 128) == 8192
then 'hole' is computed as 8192 - (4000 + 4) = 4188
If prandom_u32() % hole selects a number >= PAGE_SIZE - sizeof(*header)
then kernel will crash during bpf_jit_free():

kernel BUG at arch/x86/mm/pageattr.c:887!
Call Trace:
 [<ffffffff81037285>] change_page_attr_set_clr+0x135/0x460
 [<ffffffff81694cc0>] ? _raw_spin_unlock_irq+0x30/0x50
 [<ffffffff810378ff>] set_memory_rw+0x2f/0x40
 [<ffffffffa01a0d8d>] bpf_jit_free_deferred+0x2d/0x60
 [<ffffffff8106bf98>] process_one_work+0x1d8/0x6a0
 [<ffffffff8106bf38>] ? process_one_work+0x178/0x6a0
 [<ffffffff8106c90c>] worker_thread+0x11c/0x370

since bpf_jit_free() does:
  unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
  struct bpf_binary_header *header = (void *)addr;
to compute start address of 'bpf_binary_header'
and header->pages will pass junk to:
  set_memory_rw(addr, header->pages);

Fix it by making sure that &header->image[prandom_u32() % hole] and &header
are in the same page.

Fixes: aa2d2c73c21f2 ("s390/bpf,jit: address randomize and write protect jit code")

Reported-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: <stable@vger.kernel.org> # v3.11+
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
arch/s390/net/bpf_jit_comp.c