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From 6bb1d52f0554f687ef27de46c0b9daac9d256d60 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Wed, 10 Oct 2018 11:34:30 +0200
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Subject: [PATCH] tree-wide: various ubsan zero size memory fixes
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Fixes: #10346
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(cherry picked from commit 65f95765d05ddcd9e5849b68c379afa7e87d1248)
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Resolves: #1683319
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---
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src/basic/bitmap.c | 2 +-
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src/basic/util.h | 8 +++++++-
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src/test/test-hexdecoct.c | 2 +-
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3 files changed, 9 insertions(+), 3 deletions(-)
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diff --git a/src/basic/bitmap.c b/src/basic/bitmap.c
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index c17c6a7a02..a4cd6451b0 100644
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--- a/src/basic/bitmap.c
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+++ b/src/basic/bitmap.c
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@@ -206,7 +206,7 @@ bool bitmap_equal(Bitmap *a, Bitmap *b) {
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return true;
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common_n_bitmaps = MIN(a->n_bitmaps, b->n_bitmaps);
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- if (memcmp(a->bitmaps, b->bitmaps, sizeof(uint64_t) * common_n_bitmaps) != 0)
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+ if (memcmp_safe(a->bitmaps, b->bitmaps, sizeof(uint64_t) * common_n_bitmaps) != 0)
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return false;
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c = a->n_bitmaps > b->n_bitmaps ? a : b;
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diff --git a/src/basic/util.h b/src/basic/util.h
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index b68ef25ed8..4659a21b06 100644
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--- a/src/basic/util.h
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+++ b/src/basic/util.h
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@@ -134,7 +134,13 @@ static inline int memcmp_safe(const void *s1, const void *s2, size_t n) {
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int on_ac_power(void);
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-#define memzero(x,l) (memset((x), 0, (l)))
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+#define memzero(x,l) \
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+ ({ \
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+ size_t _l_ = (l); \
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+ void *_x_ = (x); \
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+ _l_ == 0 ? _x_ : memset(_x_, 0, _l_); \
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+ })
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+
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#define zero(x) (memzero(&(x), sizeof(x)))
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static inline void *mempset(void *s, int c, size_t n) {
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diff --git a/src/test/test-hexdecoct.c b/src/test/test-hexdecoct.c
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index da9f3008bb..a972ddcef7 100644
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--- a/src/test/test-hexdecoct.c
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+++ b/src/test/test-hexdecoct.c
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@@ -84,7 +84,7 @@ static void test_unhexmem_one(const char *s, size_t l, int retval) {
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l = strlen(s);
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assert_se(hex = hexmem(mem, len));
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- answer = strndupa(s, l);
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+ answer = strndupa(s ?: "", l);
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assert_se(streq(delete_chars(answer, WHITESPACE), hex));
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}
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}
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