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Add note on free list pointers overwriting M_PERTURB bytes

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Fixes BZ #12140.
This commit is contained in:
Siddhesh Poyarekar 2012-10-18 08:25:03 +05:30
parent f9b9d9c945
commit b741de23e2
3 changed files with 18 additions and 8 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-10-18 Siddhesh Poyarekar <siddhesh@redhat.com>
[BZ #12140]
* manual/memory.texi (Malloc Tunable Parameters): Add note
about free list pointers overwriting some perturb bytes.
Wording suggested by Roland McGrath.
2012-10-17 Joseph Myers <joseph@codesourcery.com>
* math/libm-test.inc (gamma_test): Do not call feclearexcept.

14
NEWS
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@ -10,13 +10,13 @@ Version 2.17
* The following bugs are resolved with this release:
1349, 3479, 5044, 5298, 5400, 6530, 6778, 6808, 9685, 9914, 10014, 10038,
10631, 11438, 11607, 13412, 13542, 13629, 13679, 13696, 13717, 13741,
13939, 13966, 14042, 14090, 14150, 14151, 14154, 14157, 14166, 14173,
14195, 14237, 14251, 14252, 14283, 14298, 14303, 14307, 14328, 14331,
14336, 14337, 14347, 14349, 14376, 14417, 14459, 14476, 14477, 14505,
14510, 14516, 14518, 14519, 14530, 14532, 14538, 14543, 14544, 14545,
14557, 14562, 14568, 14576, 14579, 14583, 14587, 14602, 14621, 14638,
14645, 14648, 14652, 14660, 14661, 14716.
10631, 11438, 11607, 12140, 13412, 13542, 13629, 13679, 13696, 13717,
13741, 13939, 13966, 14042, 14090, 14150, 14151, 14154, 14157, 14166,
14173, 14195, 14237, 14251, 14252, 14283, 14298, 14303, 14307, 14328,
14331, 14336, 14337, 14347, 14349, 14376, 14417, 14459, 14476, 14477,
14505, 14510, 14516, 14518, 14519, 14530, 14532, 14538, 14543, 14544,
14545, 14557, 14562, 14568, 14576, 14579, 14583, 14587, 14602, 14621,
14638, 14645, 14648, 14652, 14660, 14661, 14716.
* Support for STT_GNU_IFUNC symbols added for s390 and s390x.
Optimized versions of memcpy, memset, and memcmp added for System z10 and

5
manual/memory.texi
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@ -706,7 +706,10 @@ to zero disables all use of @code{mmap}.
If non-zero, memory blocks are filled with values depending on some
low order bits of this parameter when they are allocated (except when
allocated by @code{calloc}) and freed. This can be used to debug the
use of uninitialized or freed heap memory.
use of uninitialized or freed heap memory. Note that this option does not
guarantee that the freed block will have any specific values. It only
guarantees that the content the block had before it was freed will be
overwritten.
@end table
@end deftypefun