[libcxx-commits] [libcxx] a315fb1 - [ASan][libc++] Correct (explicit) annotation size (#79292)
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Thu Jan 25 11:41:42 PST 2024
Author: Tacet
Date: 2024-01-25T20:41:38+01:00
New Revision: a315fb1c577a40a40968daa9d346435458d7e06e
URL: https://github.com/llvm/llvm-project/commit/a315fb1c577a40a40968daa9d346435458d7e06e
DIFF: https://github.com/llvm/llvm-project/commit/a315fb1c577a40a40968daa9d346435458d7e06e.diff
LOG: [ASan][libc++] Correct (explicit) annotation size (#79292)
A quick examination suggests that the current code in the codebase does
not lead to incorrect annotations. However, the intention is for the
object after the function to be annotated in a way that only its
contents are unpoisoned and the rest is poisoned. This commit makes it
explicit and avoids potential issues in future.
In addition, I have implemented a few tests for a function that helped
me identify the specific argument value.
Notice: there is no known scenario where old code results in incorrect
annotation.
Added:
Modified:
libcxx/include/string
libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
Removed:
################################################################################
diff --git a/libcxx/include/string b/libcxx/include/string
index 618ceb71b26b48b..c5c245fa297d353 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -2380,7 +2380,7 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__
__old_sz = __n_copy + __n_add + __sec_cp_sz;
__set_long_size(__old_sz);
traits_type::assign(__p[__old_sz], value_type());
- __annotate_new(__old_cap + __delta_cap);
+ __annotate_new(__old_sz);
}
// __grow_by is deprecated because it does not set the size. It may not update the size when the size is changed, and it
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
index 93e7500a11967ce..41d4f1114c05b69 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
@@ -36,6 +36,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
test(S(), "12345678901234567890", 1, S("1"));
test(S(), "12345678901234567890", 3, S("123"));
test(S(), "12345678901234567890", 20, S("12345678901234567890"));
+ test(S(), "1234567890123456789012345678901234567890", 40, S("1234567890123456789012345678901234567890"));
test(S("12345"), "", 0, S("12345"));
test(S("12345"), "12345", 5, S("1234512345"));
@@ -44,6 +45,23 @@ TEST_CONSTEXPR_CXX20 void test_string() {
test(S("12345678901234567890"), "", 0, S("12345678901234567890"));
test(S("12345678901234567890"), "12345", 5, S("1234567890123456789012345"));
test(S("12345678901234567890"), "12345678901234567890", 20, S("1234567890123456789012345678901234567890"));
+
+ // Starting from long string (no SSO)
+ test(S("1234567890123456789012345678901234567890"), "", 0, S("1234567890123456789012345678901234567890"));
+ test(S("1234567890123456789012345678901234567890"), "a", 1, S("1234567890123456789012345678901234567890a"));
+ test(S("1234567890123456789012345678901234567890"),
+ "aaaaaaaaaa",
+ 10,
+ S("1234567890123456789012345678901234567890aaaaaaaaaa"));
+ test(S("1234567890123456789012345678901234567890"),
+ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+ 300,
+ S("1234567890123456789012345678901234567890aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+ "aaaaaaaaaaaaa"));
}
TEST_CONSTEXPR_CXX20 bool test() {
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