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From: Raoni Fassina Firmino <raoni@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/ibm/2.32/master] test-strnlen.c: Check that strnlen won't go beyond the maximum length Date: Fri, 1 Apr 2022 20:06:39 +0000 (GMT) [thread overview] Message-ID: <20220401200639.D9E803838030@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=33046deb9626e35b587db9e722111a450f952e44 commit 33046deb9626e35b587db9e722111a450f952e44 Author: H.J. Lu <hjl.tools@gmail.com> Date: Sat Mar 27 09:06:39 2021 -0700 test-strnlen.c: Check that strnlen won't go beyond the maximum length Place strings ending at page boundary without the null byte. If an implementation goes beyond EXP_LEN, it will trigger the segfault. (cherry picked from commit cb882b21b63606aabd6e55afe23b42434d95f2ef) Diff: --- string/test-strnlen.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/string/test-strnlen.c b/string/test-strnlen.c index 2a56d16c17..9b4b01a1a7 100644 --- a/string/test-strnlen.c +++ b/string/test-strnlen.c @@ -198,6 +198,35 @@ do_page_tests (void) } } +/* Tests meant to unveil fail on implementations that access bytes + beyond the maxium length. */ + +static void +do_page_2_tests (void) +{ + size_t i, exp_len, offset; + size_t last_offset = page_size / sizeof (CHAR); + + CHAR *s = (CHAR *) buf2; + MEMSET (s, 65, last_offset); + + /* Place short strings ending at page boundary without the null + byte. */ + offset = last_offset; + for (i = 0; i < 128; i++) + { + /* Decrease offset to stress several sizes and alignments. */ + offset--; + exp_len = last_offset - offset; + FOR_EACH_IMPL (impl, 0) + { + /* If an implementation goes beyond EXP_LEN, it will trigger + the segfault. */ + do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len); + } + } +} + int test_main (void) { @@ -244,6 +273,7 @@ test_main (void) do_random_tests (); do_page_tests (); + do_page_2_tests (); return ret; }
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