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| author |   Stefan Liebler <stli@linux.ibm.com> | 2019-09-18 12:40:00 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2019-09-18 12:42:39 +0200 |
| commit | 2f9046fb059e94fe254c9a4ff5bcd52182069e44 (patch) | |
| tree | 87aea58e9ee081f70571cc6daaa8f81ea6df9b37 /support/xptrace.h | |
| parent | sparc64: Use linux generic time implementation (diff) | |
| download | glibc-2f9046fb059e94fe254c9a4ff5bcd52182069e44.tar.gz glibc-2f9046fb059e94fe254c9a4ff5bcd52182069e44.tar.bz2 glibc-2f9046fb059e94fe254c9a4ff5bcd52182069e44.zip | |
Add UNSUPPORTED check in elf/tst-pldd.
The testcase forks a child process and runs pldd with PID of
this child. On systems where /proc/sys/kernel/yama/ptrace_scope
differs from zero, pldd will fail with
/usr/bin/pldd: cannot attach to process 3: Operation not permitted
This patch checks if ptrace_scope exists, is zero "classic ptrace permissions"
or one "restricted ptrace". If ptrace_scope exists and has a higher
restriction, then the test is marked as UNSUPPORTED.
The case "restricted ptrace" is handled by rearranging the processes involved
during the test. Now we have the following process tree:
-parent: do_test (performs output checks)
--subprocess 1: pldd_process (becomes pldd via execve)
---subprocess 2: target_process (ptraced via pldd)
ChangeLog:
* elf/tst-pldd.c (do_test): Add UNSUPPORTED check.
Rearrange subprocesses.
(pldd_process): New function.
* support/Makefile (libsupport-routines): Add support_ptrace.
* support/xptrace.h: New file.
* support/support_ptrace.c: Likewise.
Diffstat (limited to 'support/xptrace.h')
| -rw-r--r-- | support/xptrace.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/support/xptrace.h b/support/xptrace.h new file mode 100644 index 0000000000..7af8926805 --- /dev/null +++ b/support/xptrace.h @@ -0,0 +1,32 @@ +/* Support functions handling ptrace_scope. + Copyright (C) 2019 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/>. */ + +#ifndef SUPPORT_PTRACE_H +#define SUPPORT_PTRACE_H + +#include <sys/cdefs.h> + +__BEGIN_DECLS + +/* Return the current YAMA mode set on the machine (0 to 3) or -1 + if YAMA is not supported. */ +int support_ptrace_scope (void); + +__END_DECLS + +#endif |