linux/tools
Mathieu Desnoyers 2a1f40adfb rseq/selftests: Clarify rseq_prepare_unload() helper requirements
The rseq.h UAPI now documents that the rseq_cs field must be cleared
before reclaiming memory that contains the targeted struct rseq_cs, but
also that the rseq_cs field must be cleared before reclaiming memory of
the code pointed to by the rseq_cs start_ip and post_commit_offset
fields.

While we can expect that use of dlclose(3) will typically unmap
both struct rseq_cs and its associated code at once, nothing would
theoretically prevent a JIT from reclaiming the code without
reclaiming the struct rseq_cs, which would erroneously allow the
kernel to consider new code which is not a rseq critical section
as a rseq critical section following a code reclaim.

Suggested-by: Florian Weimer <fw@deneb.enyo.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Florian Weimer <fw@deneb.enyo.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Paul Turner <pjt@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2019-12-23 10:52:41 -07:00
..
accounting
arch tools arch x86: Sync asm/cpufeatures.h with the kernel sources 2019-12-02 15:20:05 -03:00
bpf bpftool: Don't crash on missing jited insns or ksyms 2019-12-11 13:57:26 +01:00
build perf tools: Allow to link with libbpf dynamicaly 2019-11-26 11:17:45 -03:00
cgroup
debugging
firewire
firmware
gpio tools: gpio: Correctly add make dependencies for gpio_utils 2019-11-13 13:46:04 +01:00
hv tools: hv: add vmbus testing tool 2019-11-21 20:10:44 -05:00
iio tools: iio: Correctly add make dependency for iio_utils 2019-11-10 17:11:06 +00:00
include tools headers kvm: Sync linux/kvm.h with the kernel sources 2019-12-11 10:08:35 -03:00
io_uring
kvm/kvm_stat
laptop
leds
lib libtraceevent: Allow custom libdir path 2019-12-16 13:40:26 -03:00
memory-model
nfsd
objtool Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-11-26 15:04:47 -08:00
pci
pcmcia
perf perf vendor events s390: Remove name from L1D_RO_EXCL_WRITES description 2019-12-16 13:40:26 -03:00
power platform-drivers-x86 for v5.5-1 2019-12-01 18:24:25 -08:00
scripts
spi
testing rseq/selftests: Clarify rseq_prepare_unload() helper requirements 2019-12-23 10:52:41 -07:00
thermal/tmon
time
usb usbip: tools: fix fd leakage in the function of read_attr_usbip_status 2019-11-07 11:25:01 +01:00
virtio
vm
wmi
Makefile