| commit | 7c45df18e1c524775a88c1e6fc7eac0049b3de83 | |
| author | Stefan Liebler <stli@linux.ibm.com> | |
| Tue, 29 Jun 2021 09:37:28 +0000 (29 11:37 +0200) | ||
| committer | Stefan Liebler <stli@linux.ibm.com> | |
| Thu, 1 Jul 2021 14:46:59 +0000 (1 16:46 +0200) | ||
| tree | 0dac930cc98dd8ecaffd9e11e2bf5d4130241ad8 | treesnapshot (tar.gz zip) |
| parent | ba436665b1c9e8bcef76947a4b59706bc64ceead | commitdiff |
s390: Fix MEMCHR_Z900_G5 ifunc-variant if n>=0x80000000 [BZ #28024]
On s390 (31bit), the pointer to the first byte after s always wraps
around with n >= 0x80000000 and can lead to stop searching before
end of s.
Thus this patch just use NULL as byte after s in this case and
the srst instruction stops searching with "not found" when wrapping
around from top address to zero.
This is observable with testcase string/test-memchr
starting with commit "String: Add overflow tests for strnlen, memchr,
and strncat [BZ #27974]"
https://sourceware.org/git/?p=glibc.git;a=commit;h=da5a6fba0febbfc90896ce1b2eb75c6d8a88a72d
On s390 (31bit), the pointer to the first byte after s always wraps
around with n >= 0x80000000 and can lead to stop searching before
end of s.
Thus this patch just use NULL as byte after s in this case and
the srst instruction stops searching with "not found" when wrapping
around from top address to zero.
This is observable with testcase string/test-memchr
starting with commit "String: Add overflow tests for strnlen, memchr,
and strncat [BZ #27974]"
https://sourceware.org/git/?p=glibc.git;a=commit;h=da5a6fba0febbfc90896ce1b2eb75c6d8a88a72d
| sysdeps/s390/memchr-z900.S | diffblobblamehistory |