a9dce6679d
Pull pidfd system call from Christian Brauner:
"This introduces the ability to use file descriptors from /proc/<pid>/
as stable handles on struct pid. Even if a pid is recycled the handle
will not change. For a start these fds can be used to send signals to
the processes they refer to.
With the ability to use /proc/<pid> fds as stable handles on struct
pid we can fix a long-standing issue where after a process has exited
its pid can be reused by another process. If a caller sends a signal
to a reused pid it will end up signaling the wrong process.
With this patchset we enable a variety of use cases. One obvious
example is that we can now safely delegate an important part of
process management - sending signals - to processes other than the
parent of a given process by sending file descriptors around via scm
rights and not fearing that the given process will have been recycled
in the meantime. It also allows for easy testing whether a given
process is still alive or not by sending signal 0 to a pidfd which is
quite handy.
There has been some interest in this feature e.g. from systems
management (systemd, glibc) and container managers. I have requested
and gotten comments from glibc to make sure that this syscall is
suitable for their needs as well. In the future I expect it to take on
most other pid-based signal syscalls. But such features are left for
the future once they are needed.
This has been sitting in linux-next for quite a while and has not
caused any issues. It comes with selftests which verify basic
functionality and also test that a recycled pid cannot be signaled via
a pidfd.
Jon has written about a prior version of this patchset. It should
cover the basic functionality since not a lot has changed since then:
https://lwn.net/Articles/773459/
The commit message for the syscall itself is extensively documenting
the syscall, including it's functionality and extensibility"
* tag 'pidfd-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
selftests: add tests for pidfd_send_signal()
signal: add pidfd_send_signal() syscall
177 lines
4.5 KiB
Makefile
177 lines
4.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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TARGETS = android
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TARGETS += bpf
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TARGETS += breakpoints
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TARGETS += capabilities
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TARGETS += cgroup
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TARGETS += cpufreq
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TARGETS += cpu-hotplug
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TARGETS += drivers/dma-buf
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TARGETS += efivarfs
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TARGETS += exec
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TARGETS += filesystems
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TARGETS += filesystems/binderfs
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TARGETS += firmware
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TARGETS += ftrace
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TARGETS += futex
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TARGETS += gpio
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TARGETS += ima
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TARGETS += intel_pstate
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TARGETS += ipc
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TARGETS += ir
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TARGETS += kcmp
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TARGETS += kvm
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TARGETS += lib
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TARGETS += livepatch
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TARGETS += membarrier
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TARGETS += memfd
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TARGETS += memory-hotplug
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TARGETS += mount
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TARGETS += mqueue
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TARGETS += net
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TARGETS += netfilter
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TARGETS += networking/timestamping
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TARGETS += nsfs
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TARGETS += pidfd
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TARGETS += powerpc
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TARGETS += proc
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TARGETS += pstore
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TARGETS += ptrace
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TARGETS += rseq
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TARGETS += rtc
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TARGETS += seccomp
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TARGETS += sigaltstack
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TARGETS += size
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TARGETS += sparc64
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TARGETS += splice
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TARGETS += static_keys
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TARGETS += sync
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TARGETS += sysctl
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ifneq (1, $(quicktest))
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TARGETS += timers
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endif
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TARGETS += tmpfs
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TARGETS += tpm2
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TARGETS += user
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TARGETS += vm
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TARGETS += x86
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TARGETS += zram
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#Please keep the TARGETS list alphabetically sorted
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# Run "make quicktest=1 run_tests" or
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# "make quicktest=1 kselftest" from top level Makefile
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TARGETS_HOTPLUG = cpu-hotplug
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TARGETS_HOTPLUG += memory-hotplug
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# Clear LDFLAGS and MAKEFLAGS if called from main
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# Makefile to avoid test build failures when test
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# Makefile doesn't have explicit build rules.
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ifeq (1,$(MAKELEVEL))
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override LDFLAGS =
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override MAKEFLAGS =
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endif
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ifneq ($(KBUILD_SRC),)
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override LDFLAGS =
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endif
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BUILD := $(O)
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ifndef BUILD
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BUILD := $(KBUILD_OUTPUT)
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endif
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ifndef BUILD
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BUILD := $(shell pwd)
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endif
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# KSFT_TAP_LEVEL is used from KSFT framework to prevent nested TAP header
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# printing from tests. Applicable to run_tests case where run_tests adds
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# TAP header prior running tests and when a test program invokes another
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# with system() call. Export it here to cover override RUN_TESTS defines.
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export KSFT_TAP_LEVEL=`echo 1`
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export BUILD
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all:
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@for TARGET in $(TARGETS); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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mkdir $$BUILD_TARGET -p; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET;\
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done;
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run_tests: all
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@for TARGET in $(TARGETS); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests;\
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done;
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hotplug:
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@for TARGET in $(TARGETS_HOTPLUG); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET;\
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done;
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run_hotplug: hotplug
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@for TARGET in $(TARGETS_HOTPLUG); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET run_full_test;\
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done;
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clean_hotplug:
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@for TARGET in $(TARGETS_HOTPLUG); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
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done;
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run_pstore_crash:
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make -C pstore run_crash
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INSTALL_PATH ?= install
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INSTALL_PATH := $(abspath $(INSTALL_PATH))
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ALL_SCRIPT := $(INSTALL_PATH)/run_kselftest.sh
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install:
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ifdef INSTALL_PATH
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@# Ask all targets to install their files
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mkdir -p $(INSTALL_PATH)
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@for TARGET in $(TARGETS); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET INSTALL_PATH=$(INSTALL_PATH)/$$TARGET install; \
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done;
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@# Ask all targets to emit their test scripts
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echo "#!/bin/sh" > $(ALL_SCRIPT)
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echo "BASE_DIR=\$$(realpath \$$(dirname \$$0))" >> $(ALL_SCRIPT)
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echo "cd \$$BASE_DIR" >> $(ALL_SCRIPT)
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echo "ROOT=\$$PWD" >> $(ALL_SCRIPT)
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echo "if [ \"\$$1\" = \"--summary\" ]; then" >> $(ALL_SCRIPT)
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echo " OUTPUT=\$$BASE_DIR/output.log" >> $(ALL_SCRIPT)
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echo " cat /dev/null > \$$OUTPUT" >> $(ALL_SCRIPT)
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echo "else" >> $(ALL_SCRIPT)
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echo " OUTPUT=/dev/stdout" >> $(ALL_SCRIPT)
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echo "fi" >> $(ALL_SCRIPT)
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echo "export KSFT_TAP_LEVEL=1" >> $(ALL_SCRIPT)
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echo "export skip=4" >> $(ALL_SCRIPT)
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for TARGET in $(TARGETS); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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echo "echo ; echo TAP version 13" >> $(ALL_SCRIPT); \
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echo "echo Running tests in $$TARGET" >> $(ALL_SCRIPT); \
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echo "echo ========================================" >> $(ALL_SCRIPT); \
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echo "[ -w /dev/kmsg ] && echo \"kselftest: Running tests in $$TARGET\" >> /dev/kmsg" >> $(ALL_SCRIPT); \
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echo "cd $$TARGET" >> $(ALL_SCRIPT); \
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make -s --no-print-directory OUTPUT=$$BUILD_TARGET -C $$TARGET emit_tests >> $(ALL_SCRIPT); \
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echo "cd \$$ROOT" >> $(ALL_SCRIPT); \
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done;
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chmod u+x $(ALL_SCRIPT)
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else
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$(error Error: set INSTALL_PATH to use install)
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endif
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clean:
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@for TARGET in $(TARGETS); do \
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BUILD_TARGET=$$BUILD/$$TARGET; \
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make OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
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done;
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.PHONY: all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean
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