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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-01-03 12:19:12 -0200 |
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| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-01-03 14:24:53 -0200 |
| commit | 8dad72997af2be0dc72a4bc7dbe82d85c90334fc (patch) | |
| tree | dc5d83dfccb1e2fba0354ecc9f13a538d47fbb42 /string | |
| parent | d4d629e6187e33050902824a94498b6096eacac9 (diff) | |
| download | glibc-8dad72997af2be0dc72a4bc7dbe82d85c90334fc.tar.gz glibc-8dad72997af2be0dc72a4bc7dbe82d85c90334fc.tar.xz glibc-8dad72997af2be0dc72a4bc7dbe82d85c90334fc.zip | |
Fix x86 strncat optimized implementation for large sizes
Similar to BZ#19387, BZ#21014, and BZ#20971, both x86 sse2 strncat optimized assembly implementations do not handle the size overflow correctly. The x86_64 one is in fact an issue with strcpy-sse2-unaligned, but that is triggered also with strncat optimized implementation. This patch uses a similar strategy used on 3daef2c8ee4df2, where saturared math is used for overflow case. Checked on x86_64-linux-gnu and i686-linux-gnu. It fixes BZ #19390. [BZ #19390] * string/test-strncat.c (test_main): Add tests with SIZE_MAX as maximum string size. * sysdeps/i386/i686/multiarch/strcat-sse2.S (STRCAT): Avoid overflow in pointer addition. * sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S (STRCPY): Likewise.
Diffstat (limited to 'string')
| -rw-r--r-- | string/test-strncat.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/string/test-strncat.c b/string/test-strncat.c index 55d6cc5762..26a6b5b91d 100644 --- a/string/test-strncat.c +++ b/string/test-strncat.c @@ -284,12 +284,23 @@ test_main (void) do_test (0, 0, 8, 8, n, SMALL_CHAR); do_test (0, 8, 8, 8, n, SMALL_CHAR); + do_test (0, 2, 2, 2, SIZE_MAX, SMALL_CHAR); + do_test (0, 0, 4, 4, SIZE_MAX, SMALL_CHAR); + do_test (4, 0, 4, 4, SIZE_MAX, BIG_CHAR); + do_test (0, 0, 8, 8, SIZE_MAX, SMALL_CHAR); + do_test (0, 8, 8, 8, SIZE_MAX, SMALL_CHAR); + for (i = 1; i < 8; ++i) { do_test (0, 0, 8 << i, 8 << i, n, SMALL_CHAR); do_test (8 - i, 2 * i, 8 << i, 8 << i, n, SMALL_CHAR); do_test (0, 0, 8 << i, 2 << i, n, SMALL_CHAR); do_test (8 - i, 2 * i, 8 << i, 2 << i, n, SMALL_CHAR); + + do_test (0, 0, 8 << i, 8 << i, SIZE_MAX, SMALL_CHAR); + do_test (8 - i, 2 * i, 8 << i, 8 << i, SIZE_MAX, SMALL_CHAR); + do_test (0, 0, 8 << i, 2 << i, SIZE_MAX, SMALL_CHAR); + do_test (8 - i, 2 * i, 8 << i, 2 << i, SIZE_MAX, SMALL_CHAR); } for (i = 1; i < 8; ++i) @@ -297,6 +308,10 @@ test_main (void) do_test (i, 2 * i, 8 << i, 1, n, SMALL_CHAR); do_test (2 * i, i, 8 << i, 1, n, BIG_CHAR); do_test (i, i, 8 << i, 10, n, SMALL_CHAR); + + do_test (i, 2 * i, 8 << i, 1, SIZE_MAX, SMALL_CHAR); + do_test (2 * i, i, 8 << i, 1, SIZE_MAX, BIG_CHAR); + do_test (i, i, 8 << i, 10, SIZE_MAX, SMALL_CHAR); } } |