Merged 'Infrastructure to allow fixing exec deadlocks' from Bernd Edlinger
This is an infrastructure change that makes way for fixing this issue.
Each patch was already posted previously so this is just a cleanup of
the original mailing list thread(s) which got out of control by now.
Everything started here:
https://lore.kernel.org/lkml/AM6PR03MB5170B06F3A2B75EFB98D071AE4E60@AM6PR03MB5170.eurprd03.prod.outlook.com/
I added reviewed-by tags from the mailing list threads, except when
withdrawn.
It took a lot longer than expected to collect everything from the
mailinglist threads, since several commit messages have been infected
with typos, and they got fixed without a new patch version.
- Correct the point of no return.
- Add two new mutexes to replace cred_guard_mutex.
- Fix each use of cred_guard_mutex.
- Update documentation.
- Add a test case.
-- EWB Removed the last 2 patches they need more work
Bernd Edlinger (9):
exec: Fix a deadlock in strace
selftests/ptrace: add test cases for dead-locks
mm: docs: Fix a comment in process_vm_rw_core
kernel: doc: remove outdated comment cred.c
kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve
proc: Use new infrastructure to fix deadlocks in execve
proc: io_accounting: Use new infrastructure to fix deadlocks in execve
perf: Use new infrastructure to fix deadlocks in execve
pidfd: Use new infrastructure to fix deadlocks in execve
Eric W. Biederman (5):
exec: Only compute current once in flush_old_exec
exec: Factor unshare_sighand out of de_thread and call it separately
exec: Move cleanup of posix timers on exec out of de_thread
exec: Move exec_mmap right after de_thread in flush_old_exec
exec: Add exec_update_mutex to replace cred_guard_mutex
fs/exec.c | 78 +++++++++++++++++++---------
fs/proc/base.c | 10 ++--
include/linux/binfmts.h | 8 ++-
include/linux/sched/signal.h | 9 +++-
init/init_task.c | 1 +
kernel/cred.c | 2 -
kernel/events/core.c | 12 ++---
kernel/fork.c | 5 +-
kernel/kcmp.c | 8 +--
kernel/pid.c | 4 +-
mm/process_vm_access.c | 2 +-
tools/testing/selftests/ptrace/Makefile | 4 +-
tools/testing/selftests/ptrace/vmaccess.c | 86 +++++++++++++++++++++++++++++++
13 files changed, 179 insertions(+), 50 deletions(-)
Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>