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The existing logic was simply to flip syscall entry/return state when a syscall trap was seen, and even then only with active 'catch syscall'. That can get out of sync if 'catch syscall' is toggled at odd times. This patch updates the entry/return state for all syscall traps, regardless of catching state, and also updates known syscall state for other kinds of traps. Almost all PTRACE_EVENT stops are delivered from the middle of a syscall, so this can act like an entry. Every other kind of ptrace stop is only delivered outside of syscall event pairs, so marking them ignored ensures the next syscall trap looks like an entry. Three new test scenarios are added to catch-syscall.exp: - Disable 'catch syscall' from an entry to deliberately miss the return event, then re-enable to make sure a new entry is recognized. - Enable 'catch syscall' for the first time from a vfork event, which is a PTRACE_EVENT_VFORK in the middle of the syscall. Make sure the next syscall event is recognized as the return. - Make sure entry and return are recognized for an ENOSYS syscall. This is to defeat a common x86 hack that uses the pre-filled ENOSYS return value as a sign of being on the entry side. gdb/ChangeLog: 2015-10-19 Josh Stone <jistone@redhat.com> * linux-nat.c (linux_handle_syscall_trap): Always update entry/ return state, even when not actively catching syscalls at all. (linux_handle_extended_wait): Mark syscall_state like an entry. (wait_lwp): Set syscall_state ignored for other traps. (linux_nat_filter_event): Likewise. gdb/testsuite/ChangeLog: 2015-10-19 Josh Stone <jistone@redhat.com> * gdb.base/catch-syscall.c: Include <sched.h>. (unknown_syscall): New variable. (main): Trigger a vfork and an unknown syscall. * gdb.base/catch-syscall.exp (vfork_syscalls): New variable. (unknown_syscall_number): Likewise. (check_call_to_syscall): Accept an optional syscall pattern. (check_return_from_syscall): Likewise. (check_continue): Likewise. (test_catch_syscall_without_args): Check for vfork and ENOSYS. (test_catch_syscall_skipping_return): New test toggling off 'catch syscall' to step over the syscall return, then toggling back on. (test_catch_syscall_mid_vfork): New test turning on 'catch syscall' during a PTRACE_EVENT_VFORK stop, in the middle of a vfork syscall. (do_syscall_tests): Call test_catch_syscall_without_args and test_catch_syscall_mid_vfork. (test_catch_syscall_without_args_noxml): Check for vfork and ENOSYS. (fill_all_syscalls_numbers): Initialize unknown_syscall_number. |
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| binutils | ||
| config | ||
| cpu | ||
| elfcpp | ||
| etc | ||
| gas | ||
| gdb | ||
| gold | ||
| gprof | ||
| include | ||
| intl | ||
| ld | ||
| libdecnumber | ||
| libiberty | ||
| opcodes | ||
| readline | ||
| sim | ||
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| zlib | ||
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| ChangeLog | ||
| compile | ||
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| configure | ||
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| COPYING.LIB | ||
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| depcomp | ||
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| install-sh | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
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| MAINTAINERS | ||
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.