• Ard Biesheuvel's avatar
    crypto: sha512/arm - fix crash bug in Thumb2 build · c6431650
    Ard Biesheuvel authored
    The SHA512 code we adopted from the OpenSSL project uses a rather
    peculiar way to take the address of the round constant table: it
    takes the address of the sha256_block_data_order() routine, and
    substracts a constant known quantity to arrive at the base of the
    table, which is emitted by the same assembler code right before
    the routine's entry point.
    
    However, recent versions of binutils have helpfully changed the
    behavior of references emitted via an ADR instruction when running
    in Thumb2 mode: it now takes the Thumb execution mode bit into
    account, which is bit 0 af the address. This means the produced
    table address also has bit 0 set, and so we end up with an address
    value pointing 1 byte past the start of the table, which results
    in crashes such as
    
      Unable to handle kernel paging request at virtual address bf825000
      pgd = 42f44b11
      [bf825000] *pgd=80000040206003, *pmd=5f1bd003, *pte=00000000
      Internal error: Oops: 207 [#1] PREEMPT SMP THUMB2
      Modules linked in: sha256_arm(+) sha1_arm_ce sha1_arm ...
      CPU: 7 PID: 396 Comm: cryptomgr_test Not tainted 5.0.0-rc6+ #144
      Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
      PC is at sha256_block_data_order+0xaaa/0xb30 [sha256_arm]
      LR is at __this_module+0x17fd/0xffffe800 [sha256_arm]
      pc : [<bf820bca>]    lr : [<bf824ffd>]    psr: 800b0033
      sp : ebc8bbe8  ip : faaabe1c  fp : 2fdd3433
      r10: 4c5f1692  r9 : e43037df  r8 : b04b0a5a
      r7 : c369d722  r6 : 39c3693e  r5 : 7a013189  r4 : 1580d26b
      r3 : 8762a9b0  r2 : eea9c2cd  r1 : 3e9ab536  r0 : 1dea4ae7
      Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user
      Control: 70c5383d  Table: 6b8467c0  DAC: dbadc0de
      Process cryptomgr_test (pid: 396, stack limit = 0x69e1fe23)
      Stack: (0xebc8bbe8 to 0xebc8c000)
      ...
      unwind: Unknown symbol address bf820bca
      unwind: Index not found bf820bca
      Code: 441a ea80 40f9 440a (f85e) 3b04
      ---[ end trace e560cce92700ef8a ]---
    
    Given that this affects older kernels as well, in case they are built
    with a recent toolchain, apply a minimal backportable fix, which is
    to emit another non-code label at the start of the routine, and
    reference that instead. (This is similar to the current upstream state
    of this file in OpenSSL)
    Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    c6431650
sha512-armv4.pl 16.9 KB