diff options
author | Florian Weimer <fweimer@redhat.com> | 2022-08-26 21:15:43 +0200 |
---|---|---|
committer | Florian Weimer <fweimer@redhat.com> | 2022-08-30 16:31:03 +0200 |
commit | 924e4f3eaa502ce82fccf8537f021a796d158771 (patch) | |
tree | 6918e25d51a6554894f760b1d224c82290dabc7f /elf/tst-dlmopen-twice-mod1.c | |
parent | b0e7888d1fa2dbd2d9e1645ec8c796abf78880b9 (diff) | |
download | glibc-924e4f3eaa502ce82fccf8537f021a796d158771.tar.gz glibc-924e4f3eaa502ce82fccf8537f021a796d158771.tar.xz glibc-924e4f3eaa502ce82fccf8537f021a796d158771.zip |
elf: Call __libc_early_init for reused namespaces (bug 29528)
libc_map is never reset to NULL, neither during dlclose nor on a dlopen call which reuses the namespace structure. As a result, if a namespace is reused, its libc is not initialized properly. The most visible result is a crash in the <ctype.h> functions. To prevent similar bugs on namespace reuse from surfacing, unconditionally initialize the chosen namespace to zero using memset. (cherry picked from commit d0e357ff45a75553dee3b17ed7d303bfa544f6fe)
Diffstat (limited to 'elf/tst-dlmopen-twice-mod1.c')
-rw-r--r-- | elf/tst-dlmopen-twice-mod1.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/elf/tst-dlmopen-twice-mod1.c b/elf/tst-dlmopen-twice-mod1.c new file mode 100644 index 0000000000..0eaf04948c --- /dev/null +++ b/elf/tst-dlmopen-twice-mod1.c @@ -0,0 +1,37 @@ +/* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528). Module 1. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> + +static void __attribute__ ((constructor)) +init (void) +{ + puts ("info: tst-dlmopen-twice-mod1.so loaded"); + fflush (stdout); +} + +static void __attribute__ ((destructor)) +fini (void) +{ + puts ("info: tst-dlmopen-twice-mod1.so about to be unloaded"); + fflush (stdout); +} + +/* Large allocation. The second module does not have this, so it + should load libc at a different address. */ +char large_allocate[16 * 1024 * 1024]; |