tools: bpf: make use of reallocarray

reallocarray() is a safer variant of realloc which checks for
multiplication overflow in case of array allocation.  Since it's
not available in Glibc < 2.26 import kernel's overflow.h and
add a static inline implementation when needed.  Use feature
detection to probe for existence of reallocarray.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

3 files changed, 302 insertions, 0 deletions

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index 70fe61295733..0d35f18006a1 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -36,3 +36,7 @@
 #endif
 #define __printf(a, b)  __attribute__((format(printf, a, b)))
 #define __scanf(a, b)   __attribute__((format(scanf, a, b)))
+
+#if GCC_VERSION >= 50100
+#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
+#endif
diff --git a/tools/include/linux/overflow.h b/tools/include/linux/overflow.h
new file mode 100644
index 000000000000..8712ff70995f
--- /dev/null
+++ b/tools/include/linux/overflow.h
@@ -0,0 +1,278 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+#ifndef __LINUX_OVERFLOW_H
+#define __LINUX_OVERFLOW_H
+
+#include <linux/compiler.h>
+
+/*
+ * In the fallback code below, we need to compute the minimum and
+ * maximum values representable in a given type. These macros may also
+ * be useful elsewhere, so we provide them outside the
+ * COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW block.
+ *
+ * It would seem more obvious to do something like
+ *
+ * #define type_min(T) (T)(is_signed_type(T) ? (T)1 << (8*sizeof(T)-1) : 0)
+ * #define type_max(T) (T)(is_signed_type(T) ? ((T)1 << (8*sizeof(T)-1)) - 1 : ~(T)0)
+ *
+ * Unfortunately, the middle expressions, strictly speaking, have
+ * undefined behaviour, and at least some versions of gcc warn about
+ * the type_max expression (but not if -fsanitize=undefined is in
+ * effect; in that case, the warning is deferred to runtime...).
+ *
+ * The slightly excessive casting in type_min is to make sure the
+ * macros also produce sensible values for the exotic type _Bool. [The
+ * overflow checkers only almost work for _Bool, but that's
+ * a-feature-not-a-bug, since people shouldn't be doing arithmetic on
+ * _Bools. Besides, the gcc builtins don't allow _Bool* as third
+ * argument.]
+ *
+ * Idea stolen from
+ * https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
+ * credit to Christian Biere.
+ */
+#define is_signed_type(type)       (((type)(-1)) < (type)1)
+#define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
+#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
+#define type_min(T) ((T)((T)-type_max(T)-(T)1))
+
+
+#ifdef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
+/*
+ * For simplicity and code hygiene, the fallback code below insists on
+ * a, b and *d having the same type (similar to the min() and max()
+ * macros), whereas gcc's type-generic overflow checkers accept
+ * different types. Hence we don't just make check_add_overflow an
+ * alias for __builtin_add_overflow, but add type checks similar to
+ * below.
+ */
+#define check_add_overflow(a, b, d) ({          \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        __builtin_add_overflow(__a, __b, __d);  \
+})
+
+#define check_sub_overflow(a, b, d) ({          \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        __builtin_sub_overflow(__a, __b, __d);  \
+})
+
+#define check_mul_overflow(a, b, d) ({          \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        __builtin_mul_overflow(__a, __b, __d);  \
+})
+
+#else
+
+
+/* Checking for unsigned overflow is relatively easy without causing UB. */
+#define __unsigned_add_overflow(a, b, d) ({     \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        *__d = __a + __b;                       \
+        *__d < __a;                             \
+})
+#define __unsigned_sub_overflow(a, b, d) ({     \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        *__d = __a - __b;                       \
+        __a < __b;                              \
+})
+/*
+ * If one of a or b is a compile-time constant, this avoids a division.
+ */
+#define __unsigned_mul_overflow(a, b, d) ({             \
+        typeof(a) __a = (a);                            \
+        typeof(b) __b = (b);                            \
+        typeof(d) __d = (d);                            \
+        (void) (&__a == &__b);                          \
+        (void) (&__a == __d);                           \
+        *__d = __a * __b;                               \
+        __builtin_constant_p(__b) ?                     \
+          __b > 0 && __a > type_max(typeof(__a)) / __b : \
+          __a > 0 && __b > type_max(typeof(__b)) / __a;  \
+})
+
+/*
+ * For signed types, detecting overflow is much harder, especially if
+ * we want to avoid UB. But the interface of these macros is such that
+ * we must provide a result in *d, and in fact we must produce the
+ * result promised by gcc's builtins, which is simply the possibly
+ * wrapped-around value. Fortunately, we can just formally do the
+ * operations in the widest relevant unsigned type (u64) and then
+ * truncate the result - gcc is smart enough to generate the same code
+ * with and without the (u64) casts.
+ */
+
+/*
+ * Adding two signed integers can overflow only if they have the same
+ * sign, and overflow has happened iff the result has the opposite
+ * sign.
+ */
+#define __signed_add_overflow(a, b, d) ({       \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        *__d = (u64)__a + (u64)__b;             \
+        (((~(__a ^ __b)) & (*__d ^ __a))        \
+                & type_min(typeof(__a))) != 0;  \
+})
+
+/*
+ * Subtraction is similar, except that overflow can now happen only
+ * when the signs are opposite. In this case, overflow has happened if
+ * the result has the opposite sign of a.
+ */
+#define __signed_sub_overflow(a, b, d) ({       \
+        typeof(a) __a = (a);                    \
+        typeof(b) __b = (b);                    \
+        typeof(d) __d = (d);                    \
+        (void) (&__a == &__b);                  \
+        (void) (&__a == __d);                   \
+        *__d = (u64)__a - (u64)__b;             \
+        ((((__a ^ __b)) & (*__d ^ __a))         \
+                & type_min(typeof(__a))) != 0;  \
+})
+
+/*
+ * Signed multiplication is rather hard. gcc always follows C99, so
+ * division is truncated towards 0. This means that we can write the
+ * overflow check like this:
+ *
+ * (a > 0 && (b > MAX/a || b < MIN/a)) ||
+ * (a < -1 && (b > MIN/a || b < MAX/a) ||
+ * (a == -1 && b == MIN)
+ *
+ * The redundant casts of -1 are to silence an annoying -Wtype-limits
+ * (included in -Wextra) warning: When the type is u8 or u16, the
+ * __b_c_e in check_mul_overflow obviously selects
+ * __unsigned_mul_overflow, but unfortunately gcc still parses this
+ * code and warns about the limited range of __b.
+ */
+
+#define __signed_mul_overflow(a, b, d) ({                               \
+        typeof(a) __a = (a);                                            \
+        typeof(b) __b = (b);                                            \
+        typeof(d) __d = (d);                                            \
+        typeof(a) __tmax = type_max(typeof(a));                         \
+        typeof(a) __tmin = type_min(typeof(a));                         \
+        (void) (&__a == &__b);                                          \
+        (void) (&__a == __d);                                           \
+        *__d = (u64)__a * (u64)__b;                                     \
+        (__b > 0   && (__a > __tmax/__b || __a < __tmin/__b)) ||        \
+        (__b < (typeof(__b))-1  && (__a > __tmin/__b || __a < __tmax/__b)) || \
+        (__b == (typeof(__b))-1 && __a == __tmin);                      \
+})