Changes in Makefile

bdb561843e865eaa5bbdc5394ed9d9c91136240c - linux: implement pkey_alloc, pkey_free and pkey_mprotect

Sun, 16 Aug 2026 02:58:19 +0200

linux: implement pkey_alloc, pkey_free and pkey_mprotectBridge the Linux memory protection key syscalls to FreeBSD's nativeMPK support instead of returning ENOSYS. Modern Linux softwareprobes these at startup: Chromium-based browsers (found viawww/linux-brave) use protection keys for V8's heap and JITsandboxing, and glibc >= 2.27 exposes the full API.pkey_alloc() allocates from a per-process bitmap kept in the processemuldata (key 0 implicitly allocated, matching Linux'smm_pkey_allocation_map; ENOSPC once keys 1..15 are exhausted or whenPKU is absent, as Linux returns on such hardware) and applies therequested initial access rights to the calling thread's PKRU, locatedin the XSAVE area via xsave_area_offset(). pkey_free() isbookkeeping only: as on Linux, freeing neither untags pages norupdates PKRU. pkey_mprotect() performs the protection change andtags the range through amd64_pkru_update(), factored out ofsysarch(2)'s AMD64_SET_PKRU/AMD64_CLEAR_PKRU implementation so thatboth share the same argument checking and map read locksynchronization with a parallel pmap_vmspace_copy() on fork; tags diewith the mapping, matching Linux VMA semantics. A pkey of -1degrades to plain mprotect.The allocation map is inherited on fork and reset on exec. At execthe Linux sysvecs initialize PKRU to 0x55555554, Linux's init_pkrudefault (access disabled for keys 1..15), so memory tagged with anot yet allocated key is inaccessible to threads that were nevergranted rights -- the property V8's thread isolation relies on.Setting PKRU at exec initializes the user FPU state slightly earlierthan the lazy first-use path; the state would be initialized momentslater in rtld/libc startup regardless. Protection key faultsalready deliver SEGV_PKUERR through the existing siginfotranslation.The common code carries no architecture ifdefs. Machine-dependentstate lives in struct linux_pemuldata_md, embedded in the processemuldata in the manner of struct mdthread, and common code callsper-arch lifecycle hooks (linux_pemuldata_init_md/_exec_md) and pkeyback ends after performing the parameter validation Linux appliesregardless of hardware support. On amd64 the implementation livesin sys/amd64/linux/linux_pkru.c, compiled into linux_common andserving both the 64-bit and 32-bit Linux ABIs. Elsewhere (arm64,i386) linux_emul_md.c provides stubs returning what Linux returns onhardware without protection keys (ENOSPC from pkey_alloc;pkey_mprotect with a pkey of -1 acts as plain mprotect), soapplications take their normal no-PKU fallback instead of the ENOSYSpath.PR: 297427MFC after: 1 monthReviewed by: kibDifferential Revision: https://reviews.freebsd.org/D58782 List of files: /freebsd/sys/modules/linux/Makefile

3e2093de47251de5e6e61c08d2955251137afd01 - linux: Add required symbol to EXPORT_SYMS list

Fri, 28 Nov 2025 22:25:26 +0100

linux: Add required symbol to EXPORT_SYMS listPR: 291270 List of files: /freebsd/sys/modules/linux/Makefile

f11c79fc0046c1579faf7cdf6505c51846cc5709 - Revert "modules: Add missing opt_*.h files for stand-alone compile"

Thu, 17 Oct 2024 20:49:42 +0200

Revert "modules: Add missing opt_*.h files for stand-alone compile"This reverts commit 1a37caeb076b9d31e13c54691d7f1eeb589798bb.I'd overlooked 06c07e1203324bfe8ab4526c82dbb750864272d5 when I updated abranch I'd previously committed but not updated. My search for this inmy tree before the commit was to a stale file...Sponsored by: Netflix List of files: /freebsd/sys/modules/linux/Makefile

1a37caeb076b9d31e13c54691d7f1eeb589798bb - modules: Add missing opt_*.h files for stand-alone compile

Sat, 12 Oct 2024 22:40:41 +0200

modules: Add missing opt_*.h files for stand-alone compileStandalone compile that we at least create these opt_*.h files.Sponsored by: Netflix List of files: /freebsd/sys/modules/linux/Makefile

e9ac41698b2f322d55ccf9da50a3596edb2c1800 - Remove residual blank line at start of Makefile

Mon, 15 Jul 2024 06:46:32 +0200

Remove residual blank line at start of MakefileThis is a residual of the $FreeBSD$ removal.MFC After: 3 days (though I'll just run the command on the branches)Sponsored by: Netflix List of files: /freebsd/sys/modules/linux/Makefile

c5f906d32d2bc8e37f1e1911382e27af7e6240ff - linux: Make module standalone-buildable

Sun, 12 May 2024 00:35:54 +0200

linux: Make module standalone-buildableAdd opt_inet.h and opt_usb.h to make linux module buildable standalone.Sponsored by: Netflix List of files: /freebsd/sys/modules/linux/Makefile

8e1a7e29b6cc276a2763e61b5f61afebd4570bba - sanitizers: Avoid building genassym.c and genoffset.c with sanitizers

Tue, 10 Oct 2023 20:14:46 +0200

sanitizers: Avoid building genassym.c and genoffset.c with sanitizersSome, particularly KASAN, may insert redzones around global symbols,resulting in incorrect offset definitions because genassym.sh (ab)usessymbol sizes to assign semantic meaning.(Ideally I would be able to define this pattern in one place, but Ihaven't found a way to define a GENSYM_CFLAGS that actually works forall of the consumers (kern.post.mk, kmod.mk, sys/conf/files*).)MFC after: 1 weekSponsored by: Klara, Inc.Sponsored by: Juniper Networks, Inc. List of files: /freebsd/sys/modules/linux/Makefile

c6ae97c44d4dc0d90d20bec3235a6484912767a1 - sys: ${CFLAGS:N-flto} -> ${CFLAGS:N-flto*}

Wed, 27 Dec 2023 00:24:53 +0100

sys: ${CFLAGS:N-flto} -> ${CFLAGS:N-flto*}For the same reason as the original https://reviews.freebsd.org/D9659:-flto=, -flto=full, and -flto=thin also produce the GIMPLE/bitcodewhich is not supported by genassym, so filter those out as well.Signed-off-by: Alex Xu (Hello71) Reviewed by: impPull Request: https://github.com/freebsd/freebsd-src/pull/898 List of files: /freebsd/sys/modules/linux/Makefile

ab393e9548f8cc0ee28499c411963b798ebb38a5 - netlink: move NETLINK define to opt_global.h

Thu, 12 Oct 2023 21:55:57 +0200

netlink: move NETLINK define to opt_global.hMove the NETLINK define into opt_global.h so we can rely on it beingset correctly, without having to remember to include opt_netlink.h.This ensures that the NETLINK define is correctly set. If not wemay end up with unloadable modules, due to missing symbols (such asnlmsg_get_group_writer).PR: 274306Reviewed by: imp, markjMFC after: 3 daysDifferential Revision: https://reviews.freebsd.org/D42179 List of files: /freebsd/sys/modules/linux/Makefile

031beb4e239bfce798af17f5fe8dba8bcaf13d99 - sys: Remove $FreeBSD$: one-line sh pattern

Wed, 16 Aug 2023 19:54:58 +0200

sys: Remove $FreeBSD$: one-line sh patternRemove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/ List of files: /freebsd/sys/modules/linux/Makefile

22dca7acf7756c07d3ccbfdc8dfd10fd9ad3f9cf - linux(4): Implement xattr syscalls

Sat, 22 Jul 2023 13:03:33 +0200

linux(4): Implement xattr syscallsReviewed by:Differential revision: https://reviews.freebsd.org/D35544MFC after: 1 month List of files: /freebsd/sys/modules/linux/Makefile

c4299cec48a51996ec0bc076e5818438243e4041 - linux(4): Make linux_emul_path private

Mon, 29 May 2023 10:19:08 +0200

linux(4): Make linux_emul_path privateThere is no need to refer to linux_emul_path from outside anymore.MFC after: 2 month List of files: /freebsd/sys/modules/linux/Makefile

960562652c7a92b8dc97a63105b04e3548f8408c - linux(4): Fix opt_netlink.h inclusion

Fri, 31 Mar 2023 13:56:59 +0200

linux(4): Fix opt_netlink.h inclusionAdd opt_netlink.h to the linux_common module, on i386, where we don'tuses linux_common module, move opt_netlink.h inclusion underi386 condition.MFC after: 2 weeks List of files: /freebsd/sys/modules/linux/Makefile

126df352f5161c89516f9db83bdb892a170f04fb - linux(4): Move inclusion of i386-specific files under common condition

Fri, 31 Mar 2023 13:56:29 +0200

linux(4): Move inclusion of i386-specific files under common condition List of files: /freebsd/sys/modules/linux/Makefile

b894193501a7cb6ce5eed3cf86be5dd773cbbb2d - netlink: fix linux module build w/ netlink.

Mon, 27 Mar 2023 20:20:38 +0200

netlink: fix linux module build w/ netlink.Reported by: Marek Zarychta MFC after: 2 weeks List of files: /freebsd/sys/modules/linux/Makefile

825fbd087e6150eaf601612a5e7468ddc808e004 - linux(4): Trim unused opt_usb.h from modules Makefiles

Tue, 14 Feb 2023 15:46:33 +0100

linux(4): Trim unused opt_usb.h from modules MakefilesMFC after: 2 weeks List of files: /freebsd/sys/modules/linux/Makefile

10d16789a383a5b9e007dfd4c2e7844e044eaf7d - linux(4): Get rid of the opt_compat.h include.

Sun, 12 Feb 2023 18:24:32 +0100

linux(4): Get rid of the opt_compat.h include.Since e013e369 COMPAT_LINUX, COMPAT_LINUX32 build options are removed,so include of opt_compat.h is no more needed.MFC after: 2 weeks List of files: /freebsd/sys/modules/linux/Makefile

07db1f36848c008efb7ab6b37e199212560833ae - linux(4): Attach netlink on i386.

Mon, 06 Feb 2023 15:00:44 +0100

linux(4): Attach netlink on i386.Discussed with: melifaroMFC after: 3 days List of files: /freebsd/sys/modules/linux/Makefile

cc1b0f7d9626bbd116429014444cbf61edf708a2 - linux(4): Add coredump support to i386.

Thu, 02 Feb 2023 15:58:06 +0100

linux(4): Add coredump support to i386.MFC after: 1 week List of files: /freebsd/sys/modules/linux/Makefile

35548e48a41e292f373ed5773d9fb802ec263c92 - linux64: improve linux_support.s make rules

Tue, 19 Jul 2022 22:42:27 +0200

linux64: improve linux_support.s make rulesPreviously we relied on the .s.o rule in share/mk/bsd.suffixes.mk totell make that linux_support.o is built from linux_support.s, eventhough we do not use the .s.o rule to assemble it.Reviewed by: sjgMFC after: 1 weekSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D35864 List of files: /freebsd/sys/modules/linux/Makefile