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| author | Dmitry V. Levin <ldv@altlinux.org> | 2019-02-13 01:20:51 +0000 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2019-06-20 17:32:07 +0000 |
| commit | 21cc130b78a4db9113fb6695e2b951e697662440 (patch) | |
| tree | 2edd8f34de8751fcfaff32c18b2723e77a70edcc /sysdeps/posix/posix_fallocate64.c | |
| parent | 49bc41b64239c4726f31fa35a1af4f22fb41d51f (diff) | |
| download | glibc-21cc130b78a4db9113fb6695e2b951e697662440.zip glibc-21cc130b78a4db9113fb6695e2b951e697662440.tar.gz glibc-21cc130b78a4db9113fb6695e2b951e697662440.tar.bz2 | |
libio: do not attempt to free wide buffers of legacy streams [BZ #24228]
Commit a601b74d31ca086de38441d316a3dee24c866305 aka glibc-2.23~693
("In preparation for fixing BZ#16734, fix failure in misc/tst-error1-mem
when _G_HAVE_MMAP is turned off.") introduced a regression:
_IO_unbuffer_all now invokes _IO_wsetb to free wide buffers of all
files, including legacy standard files which are small statically
allocated objects that do not have wide buffers and the _mode member,
causing memory corruption.
Another memory corruption in _IO_unbuffer_all happens when -1
is assigned to the _mode member of legacy standard files that
do not have it.
[BZ #24228]
* libio/genops.c (_IO_unbuffer_all)
[SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)]: Do not attempt to free wide
buffers and access _IO_FILE_complete members of legacy libio streams.
* libio/tst-bz24228.c: New file.
* libio/tst-bz24228.map: Likewise.
* libio/Makefile [build-shared] (tests): Add tst-bz24228.
[build-shared] (generated): Add tst-bz24228.mtrace and
tst-bz24228.check.
[run-built-tests && build-shared] (tests-special): Add
$(objpfx)tst-bz24228-mem.out.
(LDFLAGS-tst-bz24228, tst-bz24228-ENV): New variables.
($(objpfx)tst-bz24228-mem.out): New rule.
Diffstat (limited to 'sysdeps/posix/posix_fallocate64.c')
0 files changed, 0 insertions, 0 deletions