add fortified implementations of fread/fwrite
A __size_mul_overflow utility is used to take advantage of the checked
overflow intrinsics in Clang and GCC (>= 5). The fallback for older
compilers is the optimized but less than ideal overflow checking pattern
used in OpenBSD.
Change-Id: Ibb0d4fd9b5acb67983e6a9f46844c2fd444f7e69
diff --git a/libc/libc.map b/libc/libc.map
index ffbd29c..8c3ac9e 100644
--- a/libc/libc.map
+++ b/libc/libc.map
@@ -1334,6 +1334,8 @@
LIBC_N {
global:
+ __fread_chk;
+ __fwrite_chk;
getgrgid_r;
getgrnam_r;
} LIBC;