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Message-ID: <20251112202155.1310587-1-hpa@zytor.com>
Date: Wed, 12 Nov 2025 12:21:45 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: "H. Peter Anvin" <hpa@...or.com>, "Jason A. Donenfeld" <Jason@...c4.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
"Theodore Ts'o" <tytso@....edu>,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
Xin Li <xin@...or.com>, Andrew Cooper <andrew.cooper3@...rix.com>,
Andy Lutomirski <luto@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
Borislav Petkov <bp@...en8.de>, Brian Gerst <brgerst@...il.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ingo Molnar <mingo@...hat.com>, James Morse <james.morse@....com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Josh Poimboeuf <jpoimboe@...nel.org>, Kees Cook <kees@...nel.org>,
Nam Cao <namcao@...utronix.de>, Oleg Nesterov <oleg@...hat.com>,
Perry Yuan <perry.yuan@....com>, Thomas Gleixner <tglx@...utronix.de>,
Thomas Huth <thuth@...hat.com>, Uros Bizjak <ubizjak@...il.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-sgx@...r.kernel.org, x86@...nel.org
Subject: [PATCH v3 0/3] x86/entry/vdso: clean up the vdso build, vdso updates
This patchset cleans up the vdso build by building the 32- and 64-bit
vdsos in separate directories, moving the vdso2c tool to
arch/x86/tools, and by merging common code and especially Makefile
rules between the 32- and 64-bit vdsos to the greatest extent
possible.
Be more strict about sanitizing and standardizing the vdso build
options.
Disable CFI for the vdso until the kernel adds user space IBT support.
Modernize the DWARF generation vdso32/sigreturn.S.
Add macros to cleanly call system calls from vdso source code.
Add the GNU_PROPERTY and GNU_STACK PHDRs to the vdso.
When using int $0x80 (old 32-bit hardware or FRED-capable 64-bit
hardware) skip the stack stuff in the 32-bit kernel entry code and
call int $0x80 directly when used from C code.
Changes from v3:
In arch/x86/include/asm/vdso/sys_call.h:
- remove stray comment from prototyping (Uros Biszjak)
- remove VDSO_SYSCALL6() since it would require special
handling on 32 bits with frame pointers and is
currently unused. (Uros Biszjak)
- indent nested preprocessor directives.
Changes from v2:
Too many to count - much of the patchset has been reworked
Patches:
x86/entry/vdso: rename vdso_image_* to vdso*_image
x86/entry/vdso: refactor the vdso build
x86/entry/vdso32: don't rely on int80_landing_pad for adjusting ip
x86/entry/vdso32: remove SYSCALL_ENTER_KERNEL macro in sigreturn.S
x86/entry/vdso32: remove open-coded DWARF in sigreturn.S
x86/entry/vdso: include GNU_PROPERTY and GNU_STACK PHDRs
x86/vdso: abstract out vdso system call internals
x86/cpufeature: replace X86_FEATURE_SYSENTER32 with X86_FEATURE_SYSFAST32
x86/entry/vdso32: when using int $0x80, use it directly
---
arch/x86/Kconfig.cpufeatures | 8 +
arch/x86/Makefile | 2 +-
arch/x86/entry/syscall_32.c | 2 +-
arch/x86/entry/vdso/.gitignore | 11 +-
arch/x86/entry/vdso/Makefile | 162 +--------------------
arch/x86/entry/vdso/common/Makefile.include | 89 +++++++++++
arch/x86/entry/vdso/{vdso-note.S => common/note.S} | 5 +-
arch/x86/entry/vdso/{ => common}/vclock_gettime.c | 0
arch/x86/entry/vdso/{ => common}/vdso-layout.lds.S | 51 ++++---
arch/x86/entry/vdso/{ => common}/vgetcpu.c | 0
arch/x86/entry/vdso/vdso32/Makefile | 24 +++
arch/x86/entry/vdso/vdso32/note.S | 19 +--
arch/x86/entry/vdso/vdso32/sigreturn.S | 152 +++++--------------
arch/x86/entry/vdso/vdso32/system_call.S | 22 ++-
arch/x86/entry/vdso/vdso32/vclock_gettime.c | 5 +-
arch/x86/entry/vdso/vdso32/vdso32.lds.S | 2 +-
arch/x86/entry/vdso/vdso32/vgetcpu.c | 4 +-
arch/x86/entry/vdso/vdso64/Makefile | 45 ++++++
arch/x86/entry/vdso/vdso64/note.S | 1 +
arch/x86/entry/vdso/vdso64/vclock_gettime.c | 1 +
.../entry/vdso/{vdso.lds.S => vdso64/vdso64.lds.S} | 2 +-
arch/x86/entry/vdso/{ => vdso64}/vdsox32.lds.S | 2 +-
arch/x86/entry/vdso/vdso64/vgetcpu.c | 1 +
.../entry/vdso/{ => vdso64}/vgetrandom-chacha.S | 0
arch/x86/entry/vdso/{ => vdso64}/vgetrandom.c | 2 +-
arch/x86/entry/vdso/{ => vdso64}/vsgx.S | 0
arch/x86/entry/vdso/vma.c | 24 ++-
arch/x86/include/asm/cpufeatures.h | 2 +-
arch/x86/include/asm/dwarf2.h | 1 +
arch/x86/include/asm/elf.h | 2 +-
arch/x86/include/asm/vdso.h | 6 +-
arch/x86/include/asm/vdso/gettimeofday.h | 108 +-------------
arch/x86/include/asm/vdso/sys_call.h | 105 +++++++++++++
arch/x86/kernel/asm-offsets.c | 6 +
arch/x86/kernel/cpu/centaur.c | 3 -
arch/x86/kernel/cpu/common.c | 8 +
arch/x86/kernel/cpu/intel.c | 4 +-
arch/x86/kernel/cpu/zhaoxin.c | 4 +-
arch/x86/kernel/fred.c | 2 +-
arch/x86/kernel/process_64.c | 6 +-
arch/x86/kernel/signal_32.c | 4 +-
arch/x86/tools/Makefile | 15 +-
arch/x86/{entry/vdso => tools}/vdso2c.c | 0
arch/x86/{entry/vdso => tools}/vdso2c.h | 0
arch/x86/xen/setup.c | 28 ++--
arch/x86/xen/smp_pv.c | 5 +-
arch/x86/xen/xen-ops.h | 1 -
47 files changed, 448 insertions(+), 498 deletions(-)
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