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-rw-r--r--meta/recipes-support/libgcrypt/files/0003-GCM-move-look-up-table-to-.data-section-and-unshare-.patch178
1 files changed, 178 insertions, 0 deletions
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 @@
1From a4c561aab1014c3630bc88faf6f5246fee16b020 Mon Sep 17 00:00:00 2001
2From: Jussi Kivilinna <jussi.kivilinna@iki.fi>
3Date: Fri, 31 May 2019 17:27:25 +0300
4Subject: [PATCH 3/3] GCM: move look-up table to .data section and unshare
5 between processes
6
7* cipher/cipher-gcm.c (ATTR_ALIGNED_64): New.
8(gcmR): Move to 'gcm_table' structure.
9(gcm_table): New structure for look-up table with counters before and
10after.
11(gcmR): New macro.
12(prefetch_table): Handle input with length not multiple of 256.
13(do_prefetch_tables): Modify pre- and post-table counters to unshare
14look-up table pages between processes.
15--
16
17GnuPG-bug-id: 4541
18Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
19
20Upstream-Status: Backport
21[https://github.com/gpg/libgcrypt/commit/a4c561aab1014c3630bc88faf6f5246fee16b020]
22
23CVE: CVE-2019-12904
24
25Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
26---
27 cipher/cipher-gcm.c | 106 ++++++++++++++++++++++++++++++++++------------------
28 1 file changed, 70 insertions(+), 36 deletions(-)
29
30diff --git a/cipher/cipher-gcm.c b/cipher/cipher-gcm.c
31index 11f119a..194e2ec 100644
32--- a/cipher/cipher-gcm.c
33+++ b/cipher/cipher-gcm.c
34@@ -30,6 +30,14 @@
35 #include "./cipher-internal.h"
36
37
38+/* Helper macro to force alignment to 16 or 64 bytes. */
39+#ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
40+# define ATTR_ALIGNED_64 __attribute__ ((aligned (64)))
41+#else
42+# define ATTR_ALIGNED_64
43+#endif
44+
45+
46 #ifdef GCM_USE_INTEL_PCLMUL
47 extern void _gcry_ghash_setup_intel_pclmul (gcry_cipher_hd_t c);
48
49@@ -83,40 +91,54 @@ ghash_armv7_neon (gcry_cipher_hd_t c, byte *result, const byte *buf,
50
51
52 #ifdef GCM_USE_TABLES
53-static const u16 gcmR[256] = {
54- 0x0000, 0x01c2, 0x0384, 0x0246, 0x0708, 0x06ca, 0x048c, 0x054e,
55- 0x0e10, 0x0fd2, 0x0d94, 0x0c56, 0x0918, 0x08da, 0x0a9c, 0x0b5e,
56- 0x1c20, 0x1de2, 0x1fa4, 0x1e66, 0x1b28, 0x1aea, 0x18ac, 0x196e,
57- 0x1230, 0x13f2, 0x11b4, 0x1076, 0x1538, 0x14fa, 0x16bc, 0x177e,
58- 0x3840, 0x3982, 0x3bc4, 0x3a06, 0x3f48, 0x3e8a, 0x3ccc, 0x3d0e,
59- 0x3650, 0x3792, 0x35d4, 0x3416, 0x3158, 0x309a, 0x32dc, 0x331e,
60- 0x2460, 0x25a2, 0x27e4, 0x2626, 0x2368, 0x22aa, 0x20ec, 0x212e,
61- 0x2a70, 0x2bb2, 0x29f4, 0x2836, 0x2d78, 0x2cba, 0x2efc, 0x2f3e,
62- 0x7080, 0x7142, 0x7304, 0x72c6, 0x7788, 0x764a, 0x740c, 0x75ce,
63- 0x7e90, 0x7f52, 0x7d14, 0x7cd6, 0x7998, 0x785a, 0x7a1c, 0x7bde,
64- 0x6ca0, 0x6d62, 0x6f24, 0x6ee6, 0x6ba8, 0x6a6a, 0x682c, 0x69ee,
65- 0x62b0, 0x6372, 0x6134, 0x60f6, 0x65b8, 0x647a, 0x663c, 0x67fe,
66- 0x48c0, 0x4902, 0x4b44, 0x4a86, 0x4fc8, 0x4e0a, 0x4c4c, 0x4d8e,
67- 0x46d0, 0x4712, 0x4554, 0x4496, 0x41d8, 0x401a, 0x425c, 0x439e,
68- 0x54e0, 0x5522, 0x5764, 0x56a6, 0x53e8, 0x522a, 0x506c, 0x51ae,
69- 0x5af0, 0x5b32, 0x5974, 0x58b6, 0x5df8, 0x5c3a, 0x5e7c, 0x5fbe,
70- 0xe100, 0xe0c2, 0xe284, 0xe346, 0xe608, 0xe7ca, 0xe58c, 0xe44e,
71- 0xef10, 0xeed2, 0xec94, 0xed56, 0xe818, 0xe9da, 0xeb9c, 0xea5e,
72- 0xfd20, 0xfce2, 0xfea4, 0xff66, 0xfa28, 0xfbea, 0xf9ac, 0xf86e,
73- 0xf330, 0xf2f2, 0xf0b4, 0xf176, 0xf438, 0xf5fa, 0xf7bc, 0xf67e,
74- 0xd940, 0xd882, 0xdac4, 0xdb06, 0xde48, 0xdf8a, 0xddcc, 0xdc0e,
75- 0xd750, 0xd692, 0xd4d4, 0xd516, 0xd058, 0xd19a, 0xd3dc, 0xd21e,
76- 0xc560, 0xc4a2, 0xc6e4, 0xc726, 0xc268, 0xc3aa, 0xc1ec, 0xc02e,
77- 0xcb70, 0xcab2, 0xc8f4, 0xc936, 0xcc78, 0xcdba, 0xcffc, 0xce3e,
78- 0x9180, 0x9042, 0x9204, 0x93c6, 0x9688, 0x974a, 0x950c, 0x94ce,
79- 0x9f90, 0x9e52, 0x9c14, 0x9dd6, 0x9898, 0x995a, 0x9b1c, 0x9ade,
80- 0x8da0, 0x8c62, 0x8e24, 0x8fe6, 0x8aa8, 0x8b6a, 0x892c, 0x88ee,
81- 0x83b0, 0x8272, 0x8034, 0x81f6, 0x84b8, 0x857a, 0x873c, 0x86fe,
82- 0xa9c0, 0xa802, 0xaa44, 0xab86, 0xaec8, 0xaf0a, 0xad4c, 0xac8e,
83- 0xa7d0, 0xa612, 0xa454, 0xa596, 0xa0d8, 0xa11a, 0xa35c, 0xa29e,
84- 0xb5e0, 0xb422, 0xb664, 0xb7a6, 0xb2e8, 0xb32a, 0xb16c, 0xb0ae,
85- 0xbbf0, 0xba32, 0xb874, 0xb9b6, 0xbcf8, 0xbd3a, 0xbf7c, 0xbebe,
86-};
87+static struct
88+{
89+ volatile u32 counter_head;
90+ u32 cacheline_align[64 / 4 - 1];
91+ u16 R[256];
92+ volatile u32 counter_tail;
93+} gcm_table ATTR_ALIGNED_64 =
94+ {
95+ 0,
96+ { 0, },
97+ {
98+ 0x0000, 0x01c2, 0x0384, 0x0246, 0x0708, 0x06ca, 0x048c, 0x054e,
99+ 0x0e10, 0x0fd2, 0x0d94, 0x0c56, 0x0918, 0x08da, 0x0a9c, 0x0b5e,
100+ 0x1c20, 0x1de2, 0x1fa4, 0x1e66, 0x1b28, 0x1aea, 0x18ac, 0x196e,
101+ 0x1230, 0x13f2, 0x11b4, 0x1076, 0x1538, 0x14fa, 0x16bc, 0x177e,
102+ 0x3840, 0x3982, 0x3bc4, 0x3a06, 0x3f48, 0x3e8a, 0x3ccc, 0x3d0e,
103+ 0x3650, 0x3792, 0x35d4, 0x3416, 0x3158, 0x309a, 0x32dc, 0x331e,
104+ 0x2460, 0x25a2, 0x27e4, 0x2626, 0x2368, 0x22aa, 0x20ec, 0x212e,
105+ 0x2a70, 0x2bb2, 0x29f4, 0x2836, 0x2d78, 0x2cba, 0x2efc, 0x2f3e,
106+ 0x7080, 0x7142, 0x7304, 0x72c6, 0x7788, 0x764a, 0x740c, 0x75ce,
107+ 0x7e90, 0x7f52, 0x7d14, 0x7cd6, 0x7998, 0x785a, 0x7a1c, 0x7bde,
108+ 0x6ca0, 0x6d62, 0x6f24, 0x6ee6, 0x6ba8, 0x6a6a, 0x682c, 0x69ee,
109+ 0x62b0, 0x6372, 0x6134, 0x60f6, 0x65b8, 0x647a, 0x663c, 0x67fe,
110+ 0x48c0, 0x4902, 0x4b44, 0x4a86, 0x4fc8, 0x4e0a, 0x4c4c, 0x4d8e,
111+ 0x46d0, 0x4712, 0x4554, 0x4496, 0x41d8, 0x401a, 0x425c, 0x439e,
112+ 0x54e0, 0x5522, 0x5764, 0x56a6, 0x53e8, 0x522a, 0x506c, 0x51ae,
113+ 0x5af0, 0x5b32, 0x5974, 0x58b6, 0x5df8, 0x5c3a, 0x5e7c, 0x5fbe,
114+ 0xe100, 0xe0c2, 0xe284, 0xe346, 0xe608, 0xe7ca, 0xe58c, 0xe44e,
115+ 0xef10, 0xeed2, 0xec94, 0xed56, 0xe818, 0xe9da, 0xeb9c, 0xea5e,
116+ 0xfd20, 0xfce2, 0xfea4, 0xff66, 0xfa28, 0xfbea, 0xf9ac, 0xf86e,
117+ 0xf330, 0xf2f2, 0xf0b4, 0xf176, 0xf438, 0xf5fa, 0xf7bc, 0xf67e,
118+ 0xd940, 0xd882, 0xdac4, 0xdb06, 0xde48, 0xdf8a, 0xddcc, 0xdc0e,
119+ 0xd750, 0xd692, 0xd4d4, 0xd516, 0xd058, 0xd19a, 0xd3dc, 0xd21e,
120+ 0xc560, 0xc4a2, 0xc6e4, 0xc726, 0xc268, 0xc3aa, 0xc1ec, 0xc02e,
121+ 0xcb70, 0xcab2, 0xc8f4, 0xc936, 0xcc78, 0xcdba, 0xcffc, 0xce3e,
122+ 0x9180, 0x9042, 0x9204, 0x93c6, 0x9688, 0x974a, 0x950c, 0x94ce,
123+ 0x9f90, 0x9e52, 0x9c14, 0x9dd6, 0x9898, 0x995a, 0x9b1c, 0x9ade,
124+ 0x8da0, 0x8c62, 0x8e24, 0x8fe6, 0x8aa8, 0x8b6a, 0x892c, 0x88ee,
125+ 0x83b0, 0x8272, 0x8034, 0x81f6, 0x84b8, 0x857a, 0x873c, 0x86fe,
126+ 0xa9c0, 0xa802, 0xaa44, 0xab86, 0xaec8, 0xaf0a, 0xad4c, 0xac8e,
127+ 0xa7d0, 0xa612, 0xa454, 0xa596, 0xa0d8, 0xa11a, 0xa35c, 0xa29e,
128+ 0xb5e0, 0xb422, 0xb664, 0xb7a6, 0xb2e8, 0xb32a, 0xb16c, 0xb0ae,
129+ 0xbbf0, 0xba32, 0xb874, 0xb9b6, 0xbcf8, 0xbd3a, 0xbf7c, 0xbebe,
130+ },
131+ 0
132+ };
133+
134+#define gcmR gcm_table.R
135
136 static inline
137 void prefetch_table(const void *tab, size_t len)
138@@ -124,7 +146,7 @@ void prefetch_table(const void *tab, size_t len)
139 const volatile byte *vtab = tab;
140 size_t i;
141
142- for (i = 0; i < len; i += 8 * 32)
143+ for (i = 0; len - i >= 8 * 32; i += 8 * 32)
144 {
145 (void)vtab[i + 0 * 32];
146 (void)vtab[i + 1 * 32];
147@@ -135,6 +157,10 @@ void prefetch_table(const void *tab, size_t len)
148 (void)vtab[i + 6 * 32];
149 (void)vtab[i + 7 * 32];
150 }
151+ for (; i < len; i += 32)
152+ {
153+ (void)vtab[i];
154+ }
155
156 (void)vtab[len - 1];
157 }
158@@ -142,8 +168,16 @@ void prefetch_table(const void *tab, size_t len)
159 static inline void
160 do_prefetch_tables (const void *gcmM, size_t gcmM_size)
161 {
162+ /* Modify counters to trigger copy-on-write and unsharing if physical pages
163+ * of look-up table are shared between processes. Modifying counters also
164+ * causes checksums for pages to change and hint same-page merging algorithm
165+ * that these pages are frequently changing. */
166+ gcm_table.counter_head++;
167+ gcm_table.counter_tail++;
168+
169+ /* Prefetch look-up tables to cache. */
170 prefetch_table(gcmM, gcmM_size);
171- prefetch_table(gcmR, sizeof(gcmR));
172+ prefetch_table(&gcm_table, sizeof(gcm_table));
173 }
174
175 #ifdef GCM_TABLES_USE_U64
176--
1772.7.4
178
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