main/icu: fix CVE-2020-10531

see #11329

2 files changed, 112 insertions, 2 deletions

diff --git a/main/icu/APKBUILD b/main/icu/APKBUILD
index 1af5dbc75e..bbb903c758 100644
--- a/main/icu/APKBUILD
+++ b/main/icu/APKBUILD
@@ -6,7 +6,7 @@ pkgver=62.1
 # convert x.y.z to x_y_z
 _ver=${pkgver//./_}
 
-pkgrel=0
+pkgrel=1
 pkgdesc="International Components for Unicode library"
 url="http://www.icu-project.org/"
 arch="all"
@@ -17,9 +17,12 @@ depends_dev="$pkgname=$pkgver-r$pkgrel"
 checkdepends="diffutils"
 makedepends=
 source="http://download.icu-project.org/files/icu4c/${pkgver}/${pkgname}4c-$_ver-src.tgz
+        CVE-2020-10531.patch
         "
 
 # secfixes:
+#   62.1-r1:
+#     - CVE-2020-10531
 #   57.1-r1:
 #     - CVE-2016-6293
 #   58.1-r1:
@@ -90,4 +93,5 @@ libs() {
         replaces="icu"
 }
 
-sha512sums="8295f2754fb6907e2cc8f515dccca05530963b544e89a2b8e323cd0ddfdbbe0c9eba8b367c1dbc04d7bb906b66b1003fd545ca05298939747c832c9d4431cf2a  icu4c-62_1-src.tgz"
+sha512sums="8295f2754fb6907e2cc8f515dccca05530963b544e89a2b8e323cd0ddfdbbe0c9eba8b367c1dbc04d7bb906b66b1003fd545ca05298939747c832c9d4431cf2a  icu4c-62_1-src.tgz
+cf3718d9f6a43de4e9a49d20080a04146f6b62c094d2fbd3efd898d7670c9a5ed28736a2c1e71c773a3f807dfeb8c262feeea7b9ea66bb147f58056608d7c3d6  CVE-2020-10531.patch"
diff --git a/main/icu/CVE-2020-10531.patch b/main/icu/CVE-2020-10531.patch
new file mode 100644
index 0000000000..f2eb712b1a
--- /dev/null
+++ b/main/icu/CVE-2020-10531.patch
@@ -0,0 +1,106 @@
+diff --git a/common/unistr.cpp b/common/unistr.cpp
+index 5d7cab2..78cf394 100644
+--- a/common/unistr.cpp
++++ b/common/unistr.cpp
+@@ -1544,7 +1544,11 @@ UnicodeString::doAppend(const UChar *srcChars, int32_t srcStart, int32_t srcLeng
+   }
+ 
+   int32_t oldLength = length();
+-  int32_t newLength = oldLength + srcLength;
++  int32_t newLength;
++  if (uprv_add32_overflow(oldLength, srcLength, &newLength)) {
++    setToBogus();
++       return *this;
++  }
+   // optimize append() onto a large-enough, owned string
+   if((newLength <= getCapacity() && isBufferWritable()) ||
+       cloneArrayIfNeeded(newLength, getGrowCapacity(newLength))) {
+diff --git a/test/intltest/ustrtest.cpp b/test/intltest/ustrtest.cpp
+index 4b7cb7a..c5e5a80 100644
+--- a/test/intltest/ustrtest.cpp
++++ b/test/intltest/ustrtest.cpp
+@@ -64,6 +64,7 @@ void UnicodeStringTest::runIndexedTest( int32_t index, UBool exec, const char* &
+     TESTCASE_AUTO(TestUInt16Pointers);
+     TESTCASE_AUTO(TestWCharPointers);
+     TESTCASE_AUTO(TestNullPointers);
++    TESTCASE_AUTO(TestLargeAppend);
+     TESTCASE_AUTO_END;
+ }
+ 
+@@ -2248,3 +2249,64 @@ UnicodeStringTest::TestNullPointers() {
+     UnicodeString(u"def").extract(nullptr, 0, errorCode);
+     assertEquals("buffer overflow extracting to nullptr", U_BUFFER_OVERFLOW_ERROR, errorCode);
+ }
++
++void UnicodeStringTest::TestLargeAppend() {
++    if(quick) return;
++
++    IcuTestErrorCode status(*this, "TestLargeAppend");
++    // Make a large UnicodeString
++    int32_t len = 0xAFFFFFF;
++    UnicodeString str;
++    char16_t *buf = str.getBuffer(len);
++    // A fast way to set buffer to valid Unicode.
++    // 4E4E is a valid unicode character
++    uprv_memset(buf, 0x4e, len * 2);
++    str.releaseBuffer(len);
++    UnicodeString dest;
++    // Append it 16 times
++    // 0xAFFFFFF times 16 is 0xA4FFFFF1,
++    // which is greater than INT32_MAX, which is 0x7FFFFFFF.
++    int64_t total = 0;
++    for (int32_t i = 0; i < 16; i++) {
++        dest.append(str);
++        total += len;
++        if (total <= INT32_MAX) {
++            assertFalse("dest is not bogus", dest.isBogus());
++        } else {
++            assertTrue("dest should be bogus", dest.isBogus());
++        }
++    }
++    dest.remove();
++    total = 0;
++    for (int32_t i = 0; i < 16; i++) {
++        dest.append(str);
++        total += len;
++        if (total + len <= INT32_MAX) {
++            assertFalse("dest is not bogus", dest.isBogus());
++        } else if (total <= INT32_MAX) {
++            // Check that a string of exactly the maximum size works
++            UnicodeString str2;
++            int32_t remain = INT32_MAX - total;
++            char16_t *buf2 = str2.getBuffer(remain);
++            if (buf2 == nullptr) {
++                // if somehow memory allocation fail, return the test
++                return;
++            }
++            uprv_memset(buf2, 0x4e, remain * 2);
++            str2.releaseBuffer(remain);
++            dest.append(str2);
++            total += remain;
++            assertEquals("When a string of exactly the maximum size works", (int64_t)INT32_MAX, total);
++            assertEquals("When a string of exactly the maximum size works", INT32_MAX, dest.length());
++            assertFalse("dest is not bogus", dest.isBogus());
++
++            // Check that a string size+1 goes bogus
++            str2.truncate(1);
++            dest.append(str2);
++            total++;
++            assertTrue("dest should be bogus", dest.isBogus());
++        } else {
++            assertTrue("dest should be bogus", dest.isBogus());
++        }
++    }
++}
+diff --git a/test/intltest/ustrtest.h b/test/intltest/ustrtest.h
+index 4ba348c..d2d5ee1 100644
+--- a/test/intltest/ustrtest.h
++++ b/test/intltest/ustrtest.h
+@@ -96,6 +96,7 @@ public:
+     void TestUInt16Pointers();
+     void TestWCharPointers();
+     void TestNullPointers();
++    void TestLargeAppend();
+ };
+ 
+ #endif