dev-lang/python: fix unaligned memory access

Thanks to Rolf Eike Beer for the patches.

Closes: https://bugs.gentoo.org/636400
Package-Manager: Portage-2.3.24, Repoman-2.3.6_p81

1 files changed, 42 insertions, 0 deletions

diff --git a/dev-lang/python/files/python-3.6.5-hash-unaligned.patch b/dev-lang/python/files/python-3.6.5-hash-unaligned.patch
new file mode 100644
index 000000000000..d096887cbfb7
--- /dev/null
+++ b/dev-lang/python/files/python-3.6.5-hash-unaligned.patch
@@ -0,0 +1,42 @@
+The hash implementation casts the input pointer to uint64_t* and directly reads
+from this, which may cause unaligned accesses. Use memcpy() instead so this code
+will not crash with SIGBUS on sparc.
+
+--- a/Python/pyhash.c	2017-11-29 10:21:20.283094068 +0100
++++ b/Python/pyhash.c	2017-11-29 10:24:26.733087813 +0100
+@@ -369,7 +369,7 @@
+     uint64_t k0 = _le64toh(_Py_HashSecret.siphash.k0);
+     uint64_t k1 = _le64toh(_Py_HashSecret.siphash.k1);
+     uint64_t b = (uint64_t)src_sz << 56;
+-    const uint64_t *in = (uint64_t*)src;
++    const uint8_t *in = (uint8_t*)src;
+ 
+     uint64_t v0 = k0 ^ 0x736f6d6570736575ULL;
+     uint64_t v1 = k1 ^ 0x646f72616e646f6dULL;
+@@ -378,11 +378,13 @@
+ 
+     uint64_t t;
+     uint8_t *pt;
+-    uint8_t *m;
++    const uint8_t *m;
+ 
+     while (src_sz >= 8) {
+-        uint64_t mi = _le64toh(*in);
+-        in += 1;
+-        src_sz -= 8;
++        uint64_t mi;
++        memcpy(&mi, in, sizeof(mi));
++        mi = _le64toh(mi);
++        in += sizeof(mi);
++        src_sz -= sizeof(mi);
+         v3 ^= mi;
+         DOUBLE_ROUND(v0,v1,v2,v3);
+@@ -391,7 +393,7 @@
+ 
+     t = 0;
+     pt = (uint8_t *)&t;
+-    m = (uint8_t *)in;
++    m = in;
+     switch (src_sz) {
+         case 7: pt[6] = m[6]; /* fall through */
+         case 6: pt[5] = m[5]; /* fall through */