src/sys/compat/linux/linux_futex.c, branch releng/12.2

linux(4): Prevent integer overflow in futex_requeue.

2021-06-29T20:01:56Z

To prevent a signed integer overflow in futex_requeue add a sanity check to catch negative values of nrwake or nrrequeue. Approved by: so Security: EN-21:22.linux_futex (cherry picked from commit 25b09d6f398ea8a260ee8e2e8209fd76c61e13ee) (cherry picked from commit 43a58daffe7256f0948ce895fed9fae55dec98fc)

MFC r362059:

2020-08-24T16:15:12Z

Don't use newlines with linux_msg(). No functional changes. Sponsored by: The FreeBSD Foundation

MFC r364328:

2020-08-24T13:54:58Z

Fix a lock leak when emulating futex(FUTEX_WAIT_BITSET).

MFC r362052:

2020-08-23T22:12:55Z

Improve the warnings. Sponsored by: The FreeBSD Foundation

MFC r353725 by yuripv:

2020-08-23T21:48:57Z

linux: futex_mtx should follow futex_list Move futex_mtx to linux_common.ko for amd64 and aarch64 along with respective list/mutex init/destroy. PR: 240989 Reported by: Alex S

MFC r353724 by yuripv:

2020-08-23T21:46:48Z

linux: provide just one instance of futex_list Move futex_list definition to linux.c which is included once in linux.ko (i386) and in linux_common.ko (amd64 and aarch64) allowing 32/64 bit linux programs to access the same futexes in the latter case. PR: 240989

MFC r357668:

2020-02-14T13:10:52Z

linux futex_put(): do not touch futex after dropping our reference.

Make timespecadd(3) and friends public

2018-07-30T15:46:40Z

The timespecadd(3) family of macros were imported from NetBSD back in r35029. However, they were initially guarded by #ifdef _KERNEL. In the meantime, we have grown at least 28 syscalls that use timespecs in some way, leading many programs both inside and outside of the base system to redefine those macros. It's better just to make the definitions public. Our kernel currently defines two-argument versions of timespecadd and timespecsub. NetBSD, OpenBSD, and FreeDesktop.org's libbsd, however, define three-argument versions. Solaris also defines a three-argument version, but only in its kernel. This revision changes our definition to match the common three-argument version. Bump _FreeBSD_version due to the breaking KPI change. Discussed with: cem, jilles, ian, bde Differential Revision: https://reviews.freebsd.org/D14725

Fix futexes on i386 after the 4/4G split.

2018-04-24T12:50:21Z

Use proper method to access userspace. For now, only the slow copyout path is implemented. Reported and tested by: tijl (previous version) Sponsored by: The FreeBSD Foundation

sys/compat: further adoption of SPDX licensing ID tags.

2017-11-27T15:13:23Z

Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.