package/libs/openssl/patches/220-aesv8-armx.pl-Avoid-buffer-overrread-in-AES-XTS-decr.patch

   1 From 02ac9c9420275868472f33b01def01218742b8bb Mon Sep 17 00:00:00 2001
   2 From: Tomas Mraz <tomas@openssl.org>
   3 Date: Mon, 17 Apr 2023 16:51:20 +0200
   4 Subject: [PATCH] aesv8-armx.pl: Avoid buffer overrread in AES-XTS decryption
   5
   6 Original author: Nevine Ebeid (Amazon)
   7 Fixes: CVE-2023-1255
   8
   9 The buffer overread happens on decrypts of 4 mod 5 sizes.
  10 Unless the memory just after the buffer is unmapped this is harmless.
  11
  12 Reviewed-by: Paul Dale <pauli@openssl.org>
  13 Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
  14 (Merged from https://github.com/openssl/openssl/pull/20759)
  15
  16 (cherry picked from commit 72dfe46550ee1f1bbfacd49f071419365bc23304)
  17
  18 diff --git a/crypto/aes/asm/aesv8-armx.pl b/crypto/aes/asm/aesv8-armx.pl
  19 index 6a7bf05d1b..bd583e2c89 100755
  20 --- a/crypto/aes/asm/aesv8-armx.pl
  21 +++ b/crypto/aes/asm/aesv8-armx.pl
  22 @@ -3353,7 +3353,7 @@ $code.=<<___      if ($flavour =~ /64/);
  23  .align 4
  24  .Lxts_dec_tail4x:
  25         add     $inp,$inp,#16
  26 -       vld1.32 {$dat0},[$inp],#16
  27 +       tst     $tailcnt,#0xf
  28         veor    $tmp1,$dat1,$tmp0
  29         vst1.8  {$tmp1},[$out],#16
  30         veor    $tmp2,$dat2,$tmp2
  31 @@ -3362,6 +3362,8 @@ $code.=<<___      if ($flavour =~ /64/);
  32         veor    $tmp4,$dat4,$tmp4
  33         vst1.8  {$tmp3-$tmp4},[$out],#32
  34
  35 +       b.eq    .Lxts_dec_abort
  36 +       vld1.32 {$dat0},[$inp],#16
  37         b       .Lxts_done
  38  .align 4
  39  .Lxts_outer_dec_tail: