libgcrypt: fix CVE-2019-12904

In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a
flush-and-reload side-channel attack because physical addresses are
available to other processes. (The C implementation is used on platforms
where an assembly-language implementation is unavailable.)

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2019-12904

Patches from:
https://github.com/gpg/libgcrypt/commit/1374254c2904ab5b18ba4a890856824a102d4705
https://github.com/gpg/libgcrypt/commit/daedbbb5541cd8ecda1459d3b843ea4d92788762
https://github.com/gpg/libgcrypt/commit/a4c561aab1014c3630bc88faf6f5246fee16b020

(From OE-Core rev: a981d9b753a13e100af1f654fb3384f0bcda0b65)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
(cherry picked from commit 37e390ff05b6a4509019db358ed496731d80cc51)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
(cherry picked from commit 4c207cb1ad46c0d2005ab3eae70d78c937e084b5)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

4 files changed, 603 insertions, 0 deletions

diff --git a/meta/recipes-support/libgcrypt/files/0001-Prefetch-GCM-look-up-tables.patch b/meta/recipes-support/libgcrypt/files/0001-Prefetch-GCM-look-up-tables.patch
new file mode 100644
index 0000000000..4df96f0011
--- /dev/null
+++ b/meta/recipes-support/libgcrypt/files/0001-Prefetch-GCM-look-up-tables.patch
@@ -0,0 +1,90 @@
+From 1374254c2904ab5b18ba4a890856824a102d4705 Mon Sep 17 00:00:00 2001
+From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+Date: Sat, 27 Apr 2019 19:33:28 +0300
+Subject: [PATCH 1/3] Prefetch GCM look-up tables
+
+* cipher/cipher-gcm.c (prefetch_table, do_prefetch_tables)
+(prefetch_tables): New.
+(ghash_internal): Call prefetch_tables.
+--
+
+Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+
+Upstream-Status: Backport
+[https://github.com/gpg/libgcrypt/commit/1374254c2904ab5b18ba4a890856824a102d4705]
+
+CVE: CVE-2019-12904
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ cipher/cipher-gcm.c | 33 +++++++++++++++++++++++++++++++++
+ 1 file changed, 33 insertions(+)
+
+diff --git a/cipher/cipher-gcm.c b/cipher/cipher-gcm.c
+index c19f09f..11f119a 100644
+--- a/cipher/cipher-gcm.c
++++ b/cipher/cipher-gcm.c
+@@ -118,6 +118,34 @@ static const u16 gcmR[256] = {
+   0xbbf0, 0xba32, 0xb874, 0xb9b6, 0xbcf8, 0xbd3a, 0xbf7c, 0xbebe,
+ };
+ 
++static inline
++void prefetch_table(const void *tab, size_t len)
++{
++  const volatile byte *vtab = tab;
++  size_t i;
++
++  for (i = 0; i < len; i += 8 * 32)
++    {
++      (void)vtab[i + 0 * 32];
++      (void)vtab[i + 1 * 32];
++      (void)vtab[i + 2 * 32];
++      (void)vtab[i + 3 * 32];
++      (void)vtab[i + 4 * 32];
++      (void)vtab[i + 5 * 32];
++      (void)vtab[i + 6 * 32];
++      (void)vtab[i + 7 * 32];
++    }
++
++  (void)vtab[len - 1];
++}
++
++static inline void
++do_prefetch_tables (const void *gcmM, size_t gcmM_size)
++{
++  prefetch_table(gcmM, gcmM_size);
++  prefetch_table(gcmR, sizeof(gcmR));
++}
++
+ #ifdef GCM_TABLES_USE_U64
+ static void
+ bshift (u64 * b0, u64 * b1)
+@@ -365,6 +393,8 @@ do_ghash (unsigned char *result, const unsigned char *buf, const u32 *gcmM)
+ #define fillM(c) \
+   do_fillM (c->u_mode.gcm.u_ghash_key.key, c->u_mode.gcm.gcm_table)
+ #define GHASH(c, result, buf) do_ghash (result, buf, c->u_mode.gcm.gcm_table)
++#define prefetch_tables(c) \
++  do_prefetch_tables(c->u_mode.gcm.gcm_table, sizeof(c->u_mode.gcm.gcm_table))
+ 
+ #else
+ 
+@@ -430,6 +460,7 @@ do_ghash (unsigned char *hsub, unsigned char *result, const unsigned char *buf)
+ 
+ #define fillM(c) do { } while (0)
+ #define GHASH(c, result, buf) do_ghash (c->u_mode.gcm.u_ghash_key.key, result, buf)
++#define prefetch_tables(c) do {} while (0)
+ 
+ #endif /* !GCM_USE_TABLES */
+ 
+@@ -441,6 +472,8 @@ ghash_internal (gcry_cipher_hd_t c, byte *result, const byte *buf,
+   const unsigned int blocksize = GCRY_GCM_BLOCK_LEN;
+   unsigned int burn = 0;
+ 
++  prefetch_tables (c);
++
+   while (nblocks)
+     {
+       burn = GHASH (c, result, buf);
+-- 
+2.7.4
+
diff --git a/meta/recipes-support/libgcrypt/files/0002-AES-move-look-up-tables-to-.data-section-and-unshare.patch b/meta/recipes-support/libgcrypt/files/0002-AES-move-look-up-tables-to-.data-section-and-unshare.patch
new file mode 100644
index 0000000000..c82c5b5c8a
--- /dev/null
+++ b/meta/recipes-support/libgcrypt/files/0002-AES-move-look-up-tables-to-.data-section-and-unshare.patch
@@ -0,0 +1,332 @@
+From 119348dd9aa52ab229afb5e2d3342d2b76fe81bf Mon Sep 17 00:00:00 2001
+From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+Date: Fri, 31 May 2019 17:18:09 +0300
+Subject: [PATCH 2/3] AES: move look-up tables to .data section and unshare between
+ processes
+
+* cipher/rijndael-internal.h (ATTR_ALIGNED_64): New.
+* cipher/rijndael-tables.h (encT): Move to 'enc_tables' structure.
+(enc_tables): New structure for encryption table with counters before
+and after.
+(encT): New macro.
+(dec_tables): Add counters before and after encryption table; Move
+from .rodata to .data section.
+(do_encrypt): Change 'encT' to 'enc_tables.T'.
+(do_decrypt): Change '&dec_tables' to 'dec_tables.T'.
+* cipher/cipher-gcm.c (prefetch_table): Make inline; Handle input
+with length not multiple of 256.
+(prefetch_enc, prefetch_dec): Modify pre- and post-table counters
+to unshare look-up table pages between processes.
+--
+
+GnuPG-bug-id: 4541
+Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+
+Upstream-Status: Backport
+[https://github.com/gpg/libgcrypt/commit/daedbbb5541cd8ecda1459d3b843ea4d92788762]
+
+CVE: CVE-2019-12904
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ cipher/rijndael-internal.h |   4 +-
+ cipher/rijndael-tables.h   | 155 +++++++++++++++++++++++++--------------------
+ cipher/rijndael.c          |  35 ++++++++--
+ 3 files changed, 118 insertions(+), 76 deletions(-)
+
+diff --git a/cipher/rijndael-internal.h b/cipher/rijndael-internal.h
+index 160fb8c..a62d4b7 100644
+--- a/cipher/rijndael-internal.h
++++ b/cipher/rijndael-internal.h
+@@ -29,11 +29,13 @@
+ #define BLOCKSIZE               (128/8)
+ 
+ 
+-/* Helper macro to force alignment to 16 bytes.  */
++/* Helper macro to force alignment to 16 or 64 bytes.  */
+ #ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
+ # define ATTR_ALIGNED_16  __attribute__ ((aligned (16)))
++# define ATTR_ALIGNED_64  __attribute__ ((aligned (64)))
+ #else
+ # define ATTR_ALIGNED_16
++# define ATTR_ALIGNED_64
+ #endif
+ 
+ 
+diff --git a/cipher/rijndael-tables.h b/cipher/rijndael-tables.h
+index 8359470..b54d959 100644
+--- a/cipher/rijndael-tables.h
++++ b/cipher/rijndael-tables.h
+@@ -21,80 +21,98 @@
+ /* To keep the actual implementation at a readable size we use this
+    include file to define the tables.  */
+ 
+-static const u32 encT[256] =
++static struct
++{
++  volatile u32 counter_head;
++  u32 cacheline_align[64 / 4 - 1];
++  u32 T[256];
++  volatile u32 counter_tail;
++} enc_tables ATTR_ALIGNED_64 =
+   {
+-    0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6,
+-    0x0df2f2ff, 0xbd6b6bd6, 0xb16f6fde, 0x54c5c591,
+-    0x50303060, 0x03010102, 0xa96767ce, 0x7d2b2b56,
+-    0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec,
+-    0x45caca8f, 0x9d82821f, 0x40c9c989, 0x877d7dfa,
+-    0x15fafaef, 0xeb5959b2, 0xc947478e, 0x0bf0f0fb,
+-    0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45,
+-    0xbf9c9c23, 0xf7a4a453, 0x967272e4, 0x5bc0c09b,
+-    0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c,
+-    0x5a36366c, 0x413f3f7e, 0x02f7f7f5, 0x4fcccc83,
+-    0x5c343468, 0xf4a5a551, 0x34e5e5d1, 0x08f1f1f9,
+-    0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a,
+-    0x0c040408, 0x52c7c795, 0x65232346, 0x5ec3c39d,
+-    0x28181830, 0xa1969637, 0x0f05050a, 0xb59a9a2f,
+-    0x0907070e, 0x36121224, 0x9b80801b, 0x3de2e2df,
+-    0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea,
+-    0x1b090912, 0x9e83831d, 0x742c2c58, 0x2e1a1a34,
+-    0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b,
+-    0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d,
+-    0x7b292952, 0x3ee3e3dd, 0x712f2f5e, 0x97848413,
+-    0xf55353a6, 0x68d1d1b9, 0x00000000, 0x2cededc1,
+-    0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6,
+-    0xbe6a6ad4, 0x46cbcb8d, 0xd9bebe67, 0x4b393972,
+-    0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85,
+-    0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed,
+-    0xc5434386, 0xd74d4d9a, 0x55333366, 0x94858511,
+-    0xcf45458a, 0x10f9f9e9, 0x06020204, 0x817f7ffe,
+-    0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b,
+-    0xf35151a2, 0xfea3a35d, 0xc0404080, 0x8a8f8f05,
+-    0xad92923f, 0xbc9d9d21, 0x48383870, 0x04f5f5f1,
+-    0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142,
+-    0x30101020, 0x1affffe5, 0x0ef3f3fd, 0x6dd2d2bf,
+-    0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3,
+-    0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e,
+-    0x57c4c493, 0xf2a7a755, 0x827e7efc, 0x473d3d7a,
+-    0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6,
+-    0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3,
+-    0x66222244, 0x7e2a2a54, 0xab90903b, 0x8388880b,
+-    0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428,
+-    0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad,
+-    0x3be0e0db, 0x56323264, 0x4e3a3a74, 0x1e0a0a14,
+-    0xdb494992, 0x0a06060c, 0x6c242448, 0xe45c5cb8,
+-    0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4,
+-    0xa8919139, 0xa4959531, 0x37e4e4d3, 0x8b7979f2,
+-    0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda,
+-    0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949,
+-    0xb46c6cd8, 0xfa5656ac, 0x07f4f4f3, 0x25eaeacf,
+-    0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810,
+-    0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c,
+-    0x241c1c38, 0xf1a6a657, 0xc7b4b473, 0x51c6c697,
+-    0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e,
+-    0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f,
+-    0x907070e0, 0x423e3e7c, 0xc4b5b571, 0xaa6666cc,
+-    0xd8484890, 0x05030306, 0x01f6f6f7, 0x120e0e1c,
+-    0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969,
+-    0x91868617, 0x58c1c199, 0x271d1d3a, 0xb99e9e27,
+-    0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122,
+-    0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433,
+-    0xb69b9b2d, 0x221e1e3c, 0x92878715, 0x20e9e9c9,
+-    0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5,
+-    0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a,
+-    0xdabfbf65, 0x31e6e6d7, 0xc6424284, 0xb86868d0,
+-    0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e,
+-    0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c
++    0,
++    { 0, },
++    {
++      0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6,
++      0x0df2f2ff, 0xbd6b6bd6, 0xb16f6fde, 0x54c5c591,
++      0x50303060, 0x03010102, 0xa96767ce, 0x7d2b2b56,
++      0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec,
++      0x45caca8f, 0x9d82821f, 0x40c9c989, 0x877d7dfa,
++      0x15fafaef, 0xeb5959b2, 0xc947478e, 0x0bf0f0fb,
++      0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45,
++      0xbf9c9c23, 0xf7a4a453, 0x967272e4, 0x5bc0c09b,
++      0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c,
++      0x5a36366c, 0x413f3f7e, 0x02f7f7f5, 0x4fcccc83,
++      0x5c343468, 0xf4a5a551, 0x34e5e5d1, 0x08f1f1f9,
++      0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a,
++      0x0c040408, 0x52c7c795, 0x65232346, 0x5ec3c39d,
++      0x28181830, 0xa1969637, 0x0f05050a, 0xb59a9a2f,
++      0x0907070e, 0x36121224, 0x9b80801b, 0x3de2e2df,
++      0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea,
++      0x1b090912, 0x9e83831d, 0x742c2c58, 0x2e1a1a34,
++      0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b,
++      0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d,
++      0x7b292952, 0x3ee3e3dd, 0x712f2f5e, 0x97848413,
++      0xf55353a6, 0x68d1d1b9, 0x00000000, 0x2cededc1,
++      0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6,
++      0xbe6a6ad4, 0x46cbcb8d, 0xd9bebe67, 0x4b393972,
++      0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85,
++      0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed,
++      0xc5434386, 0xd74d4d9a, 0x55333366, 0x94858511,
++      0xcf45458a, 0x10f9f9e9, 0x06020204, 0x817f7ffe,
++      0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b,
++      0xf35151a2, 0xfea3a35d, 0xc0404080, 0x8a8f8f05,
++      0xad92923f, 0xbc9d9d21, 0x48383870, 0x04f5f5f1,
++      0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142,
++      0x30101020, 0x1affffe5, 0x0ef3f3fd, 0x6dd2d2bf,
++      0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3,
++      0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e,
++      0x57c4c493, 0xf2a7a755, 0x827e7efc, 0x473d3d7a,
++      0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6,
++      0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3,
++      0x66222244, 0x7e2a2a54, 0xab90903b, 0x8388880b,
++      0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428,
++      0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad,
++      0x3be0e0db, 0x56323264, 0x4e3a3a74, 0x1e0a0a14,
++      0xdb494992, 0x0a06060c, 0x6c242448, 0xe45c5cb8,
++      0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4,
++      0xa8919139, 0xa4959531, 0x37e4e4d3, 0x8b7979f2,
++      0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda,
++      0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949,
++      0xb46c6cd8, 0xfa5656ac, 0x07f4f4f3, 0x25eaeacf,
++      0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810,
++      0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c,
++      0x241c1c38, 0xf1a6a657, 0xc7b4b473, 0x51c6c697,
++      0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e,
++      0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f,
++      0x907070e0, 0x423e3e7c, 0xc4b5b571, 0xaa6666cc,
++      0xd8484890, 0x05030306, 0x01f6f6f7, 0x120e0e1c,
++      0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969,
++      0x91868617, 0x58c1c199, 0x271d1d3a, 0xb99e9e27,
++      0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122,
++      0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433,
++      0xb69b9b2d, 0x221e1e3c, 0x92878715, 0x20e9e9c9,
++      0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5,
++      0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a,
++      0xdabfbf65, 0x31e6e6d7, 0xc6424284, 0xb86868d0,
++      0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e,
++      0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c
++    },
++    0
+   };
+ 
+-static const struct
++#define encT enc_tables.T
++
++static struct
+ {
++  volatile u32 counter_head;
++  u32 cacheline_align[64 / 4 - 1];
+   u32 T[256];
+   byte inv_sbox[256];
+-} dec_tables =
++  volatile u32 counter_tail;
++} dec_tables ATTR_ALIGNED_64 =
+   {
++    0,
++    { 0, },
+     {
+       0x50a7f451, 0x5365417e, 0xc3a4171a, 0x965e273a,
+       0xcb6bab3b, 0xf1459d1f, 0xab58faac, 0x9303e34b,
+@@ -194,7 +212,8 @@ static const struct
+       0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61,
+       0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,
+       0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d
+-    }
++    },
++    0
+   };
+ 
+ #define decT dec_tables.T
+diff --git a/cipher/rijndael.c b/cipher/rijndael.c
+index 8637195..d0edab2 100644
+--- a/cipher/rijndael.c
++++ b/cipher/rijndael.c
+@@ -227,11 +227,11 @@ static const char *selftest(void);
+ 
+ 
+ /* Prefetching for encryption/decryption tables. */
+-static void prefetch_table(const volatile byte *tab, size_t len)
++static inline void prefetch_table(const volatile byte *tab, size_t len)
+ {
+   size_t i;
+ 
+-  for (i = 0; i < len; i += 8 * 32)
++  for (i = 0; len - i >= 8 * 32; i += 8 * 32)
+     {
+       (void)tab[i + 0 * 32];
+       (void)tab[i + 1 * 32];
+@@ -242,17 +242,37 @@ static void prefetch_table(const volatile byte *tab, size_t len)
+       (void)tab[i + 6 * 32];
+       (void)tab[i + 7 * 32];
+     }
++  for (; i < len; i += 32)
++    {
++      (void)tab[i];
++    }
+ 
+   (void)tab[len - 1];
+ }
+ 
+ static void prefetch_enc(void)
+ {
+-  prefetch_table((const void *)encT, sizeof(encT));
++  /* Modify counters to trigger copy-on-write and unsharing if physical pages
++   * of look-up table are shared between processes.  Modifying counters also
++   * causes checksums for pages to change and hint same-page merging algorithm
++   * that these pages are frequently changing.  */
++  enc_tables.counter_head++;
++  enc_tables.counter_tail++;
++
++  /* Prefetch look-up tables to cache.  */
++  prefetch_table((const void *)&enc_tables, sizeof(enc_tables));
+ }
+ 
+ static void prefetch_dec(void)
+ {
++  /* Modify counters to trigger copy-on-write and unsharing if physical pages
++   * of look-up table are shared between processes.  Modifying counters also
++   * causes checksums for pages to change and hint same-page merging algorithm
++   * that these pages are frequently changing.  */
++  dec_tables.counter_head++;
++  dec_tables.counter_tail++;
++
++  /* Prefetch look-up tables to cache.  */
+   prefetch_table((const void *)&dec_tables, sizeof(dec_tables));
+ }
+ 
+@@ -737,7 +757,7 @@ do_encrypt (const RIJNDAEL_context *ctx,
+ #ifdef USE_AMD64_ASM
+ # ifdef HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS
+   return _gcry_aes_amd64_encrypt_block(ctx->keyschenc, bx, ax, ctx->rounds,
+-                                      encT);
++                                      enc_tables.T);
+ # else
+   /* Call SystemV ABI function without storing non-volatile XMM registers,
+    * as target function does not use vector instruction sets. */
+@@ -757,7 +777,8 @@ do_encrypt (const RIJNDAEL_context *ctx,
+   return ret;
+ # endif /* HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS */
+ #elif defined(USE_ARM_ASM)
+-  return _gcry_aes_arm_encrypt_block(ctx->keyschenc, bx, ax, ctx->rounds, encT);
++  return _gcry_aes_arm_encrypt_block(ctx->keyschenc, bx, ax, ctx->rounds,
++                                    enc_tables.T);
+ #else
+   return do_encrypt_fn (ctx, bx, ax);
+ #endif /* !USE_ARM_ASM && !USE_AMD64_ASM*/
+@@ -1120,7 +1141,7 @@ do_decrypt (const RIJNDAEL_context *ctx, unsigned char *bx,
+ #ifdef USE_AMD64_ASM
+ # ifdef HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS
+   return _gcry_aes_amd64_decrypt_block(ctx->keyschdec, bx, ax, ctx->rounds,
+-                                      &dec_tables);
++                                      dec_tables.T);
+ # else
+   /* Call SystemV ABI function without storing non-volatile XMM registers,
+    * as target function does not use vector instruction sets. */
+@@ -1141,7 +1162,7 @@ do_decrypt (const RIJNDAEL_context *ctx, unsigned char *bx,
+ # endif /* HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS */
+ #elif defined(USE_ARM_ASM)
+   return _gcry_aes_arm_decrypt_block(ctx->keyschdec, bx, ax, ctx->rounds,
+-                                    &dec_tables);
++                                    dec_tables.T);
+ #else
+   return do_decrypt_fn (ctx, bx, ax);
+ #endif /*!USE_ARM_ASM && !USE_AMD64_ASM*/
+-- 
+2.7.4
+
diff --git a/meta/recipes-support/libgcrypt/files/0003-GCM-move-look-up-table-to-.data-section-and-unshare-.patch b/meta/recipes-support/libgcrypt/files/0003-GCM-move-look-up-table-to-.data-section-and-unshare-.patch
new file mode 100644
index 0000000000..b580b7b13c
--- /dev/null
+++ b/meta/recipes-support/libgcrypt/files/0003-GCM-move-look-up-table-to-.data-section-and-unshare-.patch
@@ -0,0 +1,178 @@
+From a4c561aab1014c3630bc88faf6f5246fee16b020 Mon Sep 17 00:00:00 2001
+From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+Date: Fri, 31 May 2019 17:27:25 +0300
+Subject: [PATCH 3/3] GCM: move look-up table to .data section and unshare
+ between processes
+
+* cipher/cipher-gcm.c (ATTR_ALIGNED_64): New.
+(gcmR): Move to 'gcm_table' structure.
+(gcm_table): New structure for look-up table with counters before and
+after.
+(gcmR): New macro.
+(prefetch_table): Handle input with length not multiple of 256.
+(do_prefetch_tables): Modify pre- and post-table counters to unshare
+look-up table pages between processes.
+--
+
+GnuPG-bug-id: 4541
+Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
+
+Upstream-Status: Backport
+[https://github.com/gpg/libgcrypt/commit/a4c561aab1014c3630bc88faf6f5246fee16b020]
+
+CVE: CVE-2019-12904
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ cipher/cipher-gcm.c | 106 ++++++++++++++++++++++++++++++++++------------------
+ 1 file changed, 70 insertions(+), 36 deletions(-)
+
+diff --git a/cipher/cipher-gcm.c b/cipher/cipher-gcm.c
+index 11f119a..194e2ec 100644
+--- a/cipher/cipher-gcm.c
++++ b/cipher/cipher-gcm.c
+@@ -30,6 +30,14 @@
+ #include "./cipher-internal.h"
+ 
+ 
++/* Helper macro to force alignment to 16 or 64 bytes.  */
++#ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
++# define ATTR_ALIGNED_64  __attribute__ ((aligned (64)))
++#else
++# define ATTR_ALIGNED_64
++#endif
++
++
+ #ifdef GCM_USE_INTEL_PCLMUL
+ extern void _gcry_ghash_setup_intel_pclmul (gcry_cipher_hd_t c);
+ 
+@@ -83,40 +91,54 @@ ghash_armv7_neon (gcry_cipher_hd_t c, byte *result, const byte *buf,
+ 
+ 
+ #ifdef GCM_USE_TABLES
+-static const u16 gcmR[256] = {
+-  0x0000, 0x01c2, 0x0384, 0x0246, 0x0708, 0x06ca, 0x048c, 0x054e,
+-  0x0e10, 0x0fd2, 0x0d94, 0x0c56, 0x0918, 0x08da, 0x0a9c, 0x0b5e,
+-  0x1c20, 0x1de2, 0x1fa4, 0x1e66, 0x1b28, 0x1aea, 0x18ac, 0x196e,
+-  0x1230, 0x13f2, 0x11b4, 0x1076, 0x1538, 0x14fa, 0x16bc, 0x177e,
+-  0x3840, 0x3982, 0x3bc4, 0x3a06, 0x3f48, 0x3e8a, 0x3ccc, 0x3d0e,
+-  0x3650, 0x3792, 0x35d4, 0x3416, 0x3158, 0x309a, 0x32dc, 0x331e,
+-  0x2460, 0x25a2, 0x27e4, 0x2626, 0x2368, 0x22aa, 0x20ec, 0x212e,
+-  0x2a70, 0x2bb2, 0x29f4, 0x2836, 0x2d78, 0x2cba, 0x2efc, 0x2f3e,
+-  0x7080, 0x7142, 0x7304, 0x72c6, 0x7788, 0x764a, 0x740c, 0x75ce,
+-  0x7e90, 0x7f52, 0x7d14, 0x7cd6, 0x7998, 0x785a, 0x7a1c, 0x7bde,
+-  0x6ca0, 0x6d62, 0x6f24, 0x6ee6, 0x6ba8, 0x6a6a, 0x682c, 0x69ee,
+-  0x62b0, 0x6372, 0x6134, 0x60f6, 0x65b8, 0x647a, 0x663c, 0x67fe,
+-  0x48c0, 0x4902, 0x4b44, 0x4a86, 0x4fc8, 0x4e0a, 0x4c4c, 0x4d8e,
+-  0x46d0, 0x4712, 0x4554, 0x4496, 0x41d8, 0x401a, 0x425c, 0x439e,
+-  0x54e0, 0x5522, 0x5764, 0x56a6, 0x53e8, 0x522a, 0x506c, 0x51ae,
+-  0x5af0, 0x5b32, 0x5974, 0x58b6, 0x5df8, 0x5c3a, 0x5e7c, 0x5fbe,
+-  0xe100, 0xe0c2, 0xe284, 0xe346, 0xe608, 0xe7ca, 0xe58c, 0xe44e,
+-  0xef10, 0xeed2, 0xec94, 0xed56, 0xe818, 0xe9da, 0xeb9c, 0xea5e,
+-  0xfd20, 0xfce2, 0xfea4, 0xff66, 0xfa28, 0xfbea, 0xf9ac, 0xf86e,
+-  0xf330, 0xf2f2, 0xf0b4, 0xf176, 0xf438, 0xf5fa, 0xf7bc, 0xf67e,
+-  0xd940, 0xd882, 0xdac4, 0xdb06, 0xde48, 0xdf8a, 0xddcc, 0xdc0e,
+-  0xd750, 0xd692, 0xd4d4, 0xd516, 0xd058, 0xd19a, 0xd3dc, 0xd21e,
+-  0xc560, 0xc4a2, 0xc6e4, 0xc726, 0xc268, 0xc3aa, 0xc1ec, 0xc02e,
+-  0xcb70, 0xcab2, 0xc8f4, 0xc936, 0xcc78, 0xcdba, 0xcffc, 0xce3e,
+-  0x9180, 0x9042, 0x9204, 0x93c6, 0x9688, 0x974a, 0x950c, 0x94ce,
+-  0x9f90, 0x9e52, 0x9c14, 0x9dd6, 0x9898, 0x995a, 0x9b1c, 0x9ade,
+-  0x8da0, 0x8c62, 0x8e24, 0x8fe6, 0x8aa8, 0x8b6a, 0x892c, 0x88ee,
+-  0x83b0, 0x8272, 0x8034, 0x81f6, 0x84b8, 0x857a, 0x873c, 0x86fe,
+-  0xa9c0, 0xa802, 0xaa44, 0xab86, 0xaec8, 0xaf0a, 0xad4c, 0xac8e,
+-  0xa7d0, 0xa612, 0xa454, 0xa596, 0xa0d8, 0xa11a, 0xa35c, 0xa29e,
+-  0xb5e0, 0xb422, 0xb664, 0xb7a6, 0xb2e8, 0xb32a, 0xb16c, 0xb0ae,
+-  0xbbf0, 0xba32, 0xb874, 0xb9b6, 0xbcf8, 0xbd3a, 0xbf7c, 0xbebe,
+-};
++static struct
++{
++  volatile u32 counter_head;
++  u32 cacheline_align[64 / 4 - 1];
++  u16 R[256];
++  volatile u32 counter_tail;
++} gcm_table ATTR_ALIGNED_64 =
++  {
++    0,
++    { 0, },
++    {
++      0x0000, 0x01c2, 0x0384, 0x0246, 0x0708, 0x06ca, 0x048c, 0x054e,
++      0x0e10, 0x0fd2, 0x0d94, 0x0c56, 0x0918, 0x08da, 0x0a9c, 0x0b5e,
++      0x1c20, 0x1de2, 0x1fa4, 0x1e66, 0x1b28, 0x1aea, 0x18ac, 0x196e,
++      0x1230, 0x13f2, 0x11b4, 0x1076, 0x1538, 0x14fa, 0x16bc, 0x177e,
++      0x3840, 0x3982, 0x3bc4, 0x3a06, 0x3f48, 0x3e8a, 0x3ccc, 0x3d0e,
++      0x3650, 0x3792, 0x35d4, 0x3416, 0x3158, 0x309a, 0x32dc, 0x331e,
++      0x2460, 0x25a2, 0x27e4, 0x2626, 0x2368, 0x22aa, 0x20ec, 0x212e,
++      0x2a70, 0x2bb2, 0x29f4, 0x2836, 0x2d78, 0x2cba, 0x2efc, 0x2f3e,
++      0x7080, 0x7142, 0x7304, 0x72c6, 0x7788, 0x764a, 0x740c, 0x75ce,
++      0x7e90, 0x7f52, 0x7d14, 0x7cd6, 0x7998, 0x785a, 0x7a1c, 0x7bde,
++      0x6ca0, 0x6d62, 0x6f24, 0x6ee6, 0x6ba8, 0x6a6a, 0x682c, 0x69ee,
++      0x62b0, 0x6372, 0x6134, 0x60f6, 0x65b8, 0x647a, 0x663c, 0x67fe,
++      0x48c0, 0x4902, 0x4b44, 0x4a86, 0x4fc8, 0x4e0a, 0x4c4c, 0x4d8e,
++      0x46d0, 0x4712, 0x4554, 0x4496, 0x41d8, 0x401a, 0x425c, 0x439e,
++      0x54e0, 0x5522, 0x5764, 0x56a6, 0x53e8, 0x522a, 0x506c, 0x51ae,
++      0x5af0, 0x5b32, 0x5974, 0x58b6, 0x5df8, 0x5c3a, 0x5e7c, 0x5fbe,
++      0xe100, 0xe0c2, 0xe284, 0xe346, 0xe608, 0xe7ca, 0xe58c, 0xe44e,
++      0xef10, 0xeed2, 0xec94, 0xed56, 0xe818, 0xe9da, 0xeb9c, 0xea5e,
++      0xfd20, 0xfce2, 0xfea4, 0xff66, 0xfa28, 0xfbea, 0xf9ac, 0xf86e,
++      0xf330, 0xf2f2, 0xf0b4, 0xf176, 0xf438, 0xf5fa, 0xf7bc, 0xf67e,
++      0xd940, 0xd882, 0xdac4, 0xdb06, 0xde48, 0xdf8a, 0xddcc, 0xdc0e,
++      0xd750, 0xd692, 0xd4d4, 0xd516, 0xd058, 0xd19a, 0xd3dc, 0xd21e,
++      0xc560, 0xc4a2, 0xc6e4, 0xc726, 0xc268, 0xc3aa, 0xc1ec, 0xc02e,
++      0xcb70, 0xcab2, 0xc8f4, 0xc936, 0xcc78, 0xcdba, 0xcffc, 0xce3e,
++      0x9180, 0x9042, 0x9204, 0x93c6, 0x9688, 0x974a, 0x950c, 0x94ce,
++      0x9f90, 0x9e52, 0x9c14, 0x9dd6, 0x9898, 0x995a, 0x9b1c, 0x9ade,
++      0x8da0, 0x8c62, 0x8e24, 0x8fe6, 0x8aa8, 0x8b6a, 0x892c, 0x88ee,
++      0x83b0, 0x8272, 0x8034, 0x81f6, 0x84b8, 0x857a, 0x873c, 0x86fe,
++      0xa9c0, 0xa802, 0xaa44, 0xab86, 0xaec8, 0xaf0a, 0xad4c, 0xac8e,
++      0xa7d0, 0xa612, 0xa454, 0xa596, 0xa0d8, 0xa11a, 0xa35c, 0xa29e,
++      0xb5e0, 0xb422, 0xb664, 0xb7a6, 0xb2e8, 0xb32a, 0xb16c, 0xb0ae,
++      0xbbf0, 0xba32, 0xb874, 0xb9b6, 0xbcf8, 0xbd3a, 0xbf7c, 0xbebe,
++    },
++    0
++  };
++
++#define gcmR gcm_table.R
+ 
+ static inline
+ void prefetch_table(const void *tab, size_t len)
+@@ -124,7 +146,7 @@ void prefetch_table(const void *tab, size_t len)
+   const volatile byte *vtab = tab;
+   size_t i;
+ 
+-  for (i = 0; i < len; i += 8 * 32)
++  for (i = 0; len - i >= 8 * 32; i += 8 * 32)
+     {
+       (void)vtab[i + 0 * 32];
+       (void)vtab[i + 1 * 32];
+@@ -135,6 +157,10 @@ void prefetch_table(const void *tab, size_t len)
+       (void)vtab[i + 6 * 32];
+       (void)vtab[i + 7 * 32];
+     }
++  for (; i < len; i += 32)
++    {
++      (void)vtab[i];
++    }
+ 
+   (void)vtab[len - 1];
+ }
+@@ -142,8 +168,16 @@ void prefetch_table(const void *tab, size_t len)
+ static inline void
+ do_prefetch_tables (const void *gcmM, size_t gcmM_size)
+ {
++  /* Modify counters to trigger copy-on-write and unsharing if physical pages
++   * of look-up table are shared between processes.  Modifying counters also
++   * causes checksums for pages to change and hint same-page merging algorithm
++   * that these pages are frequently changing.  */
++  gcm_table.counter_head++;
++  gcm_table.counter_tail++;
++
++  /* Prefetch look-up tables to cache.  */
+   prefetch_table(gcmM, gcmM_size);
+-  prefetch_table(gcmR, sizeof(gcmR));
++  prefetch_table(&gcm_table, sizeof(gcm_table));
+ }
+ 
+ #ifdef GCM_TABLES_USE_U64
+-- 
+2.7.4
+
diff --git a/meta/recipes-support/libgcrypt/libgcrypt_1.8.4.bb b/meta/recipes-support/libgcrypt/libgcrypt_1.8.4.bb
index fda68a2938..11d078d44a 100644
--- a/meta/recipes-support/libgcrypt/libgcrypt_1.8.4.bb
+++ b/meta/recipes-support/libgcrypt/libgcrypt_1.8.4.bb
@@ -21,6 +21,9 @@ SRC_URI = "${GNUPG_MIRROR}/libgcrypt/libgcrypt-${PV}.tar.bz2 \
            file://0003-tests-bench-slope.c-workaround-ICE-failure-on-mips-w.patch \
            file://0002-libgcrypt-fix-building-error-with-O2-in-sysroot-path.patch \
            file://0004-tests-Makefile.am-fix-undefined-reference-to-pthread.patch \
+           file://0001-Prefetch-GCM-look-up-tables.patch \
+           file://0002-AES-move-look-up-tables-to-.data-section-and-unshare.patch \
+           file://0003-GCM-move-look-up-table-to-.data-section-and-unshare-.patch \
 "
 SRC_URI[md5sum] = "fbfdaebbbc6d7e5fbbf6ffdb3e139573"
 SRC_URI[sha256sum] = "f638143a0672628fde0cad745e9b14deb85dffb175709cacc1f4fe24b93f2227"