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Peter Anvin" To: "H. Peter Anvin" , "Jason A. Donenfeld" , "Peter Zijlstra (Intel)" , "Theodore Ts'o" , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Xin Li , Andrew Cooper , Andy Lutomirski , Ard Biesheuvel , Borislav Petkov , Brian Gerst , Dave Hansen , Ingo Molnar , James Morse , Jarkko Sakkinen , Josh Poimboeuf , Kees Cook , Nam Cao , Oleg Nesterov , Perry Yuan , Thomas Gleixner , Thomas Huth , Uros Bizjak , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-sgx@vger.kernel.org, x86@kernel.org Subject: [PATCH v4 00/10] x86/entry/vdso: clean up the vdso build, vdso updates Date: Tue, 16 Dec 2025 13:25:54 -0800 Message-ID: <20251216212606.1325678-1-hpa@zytor.com> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: r83mbeddwkseiepwyp9uhyjdjihibyms X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 6D4B840002 X-Rspam-User: X-HE-Tag: 1765920415-280881 X-HE-Meta: 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 4y8kpPzj bo2k5zsEOrIXCy9P9SYS9rHr4sGqz+TiWgp+dW+segleBLj6YZsLVzqDTEkkBsVSlQhzPj7ukziVNYeB6lEZPpZOs12M0b4J+PTRjtxsWtOnk+v4zdVKk9YUu1Tfy2dHKeqT5VK3sWuJbzkplah2kiVbGjT5OmA8xhDgsNLSL0Bye44FNJ4tRgqo00CX4WlwGQIKHNsouVdBlb5eIRviRhHqeN5xrwz/ym2kl5rllWc5WBeI= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 to v4: - Improved description of patch 01/10. - Split out the move of vdso2c to tools into a separate patch. - Remove unrelated formatting changes from vdso-layout.lds.S. - Fix *-x32.o being missing from "targets". - Rebased onto v6.19-rc1. Changes from v2 to 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 v1 to 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: move vdso2c to arch/x86/tools 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 | 38 +++-- 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 | 46 ++++++ 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, 444 insertions(+), 490 deletions(-)