| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250924142059.527768-1-benjamin@sipsolutions.net> Date: Wed, 24 Sep 2025 16:20:47 +0200 From: Benjamin Berg <benjamin@...solutions.net> To: linux-um@...ts.infradead.org, Willy Tarreau <w@....eu>, Thomas Weißschuh <linux@...ssschuh.net>, linux-kselftest@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com> Cc: linux-kernel@...r.kernel.org, Benjamin Berg <benjamin.berg@...el.com> Subject: [PATCH v3 00/12] Start porting UML to nolibc From: Benjamin Berg <benjamin.berg@...el.com> This patchset is an attempt to start a nolibc port of UML. The goal is to port UML to use nolibc in smaller chunks to make the switch more manageable. Using nolibc has the advantage that it is a smaller runtime and it allows us to be in full control about all memory mappings that are done. Another libc on the other hand might map memory unaware of UML, causing collisions with the UML memory layout. Such mappings could even happen before UML has fully initialized (e.g. rseq being mapped into the physical or vmalloc memory areas). There are three parts to this patchset: * Two patches to use tools/include headers instead of kernel headers for userspace files. * A few nolibc fixes and a new NOLIBC_NO_RUNTIME compile flag for it * Finally nolibc build support for UML and switching two files while adding the appropriate support in nolibc itself. v1 of this patchset was https://lore.kernel.org/all/20250915071115.1429196-1-benjamin@sipsolutions.net v2: https://lore.kernel.org/all/20250919153420.727385-1-benjamin@sipsolutions.net Changes in v3: - sys_ptrace is now not a varadic function - improve printf %m implementation - keep perror as function available with NOLIBC_IGNORE_ERRNO - change syscall guard and fix i386 build Changes in v2: - add sys/uio.h and sys/ptrace.h to nolibc - Use NOLIBC_NO_RUNTIME to disable nolibc startup code - Fix out-of-tree build - various small improvements and cleanups Benjamin Benjamin Berg (12): tools compiler.h: fix __used definition um: use tools/include for user files tools/nolibc/stdio: let perror work when NOLIBC_IGNORE_ERRNO is set tools/nolibc/dirent: avoid errno in readdir_r tools/nolibc: implement %m if errno is not defined tools/nolibc: use __fallthrough__ rather than fallthrough tools/nolibc: add option to disable runtime um: add infrastructure to build files using nolibc um: use nolibc for the --showconfig implementation tools/nolibc: add uio.h with readv and writev tools/nolibc: add ptrace support um: switch ptrace FP register access to nolibc arch/um/Makefile | 38 ++++++++++++--- arch/um/include/shared/init.h | 2 +- arch/um/include/shared/os.h | 2 + arch/um/include/shared/user.h | 6 --- arch/um/kernel/Makefile | 2 +- arch/um/kernel/skas/stub.c | 1 + arch/um/kernel/skas/stub_exe.c | 4 +- arch/um/os-Linux/skas/process.c | 6 +-- arch/um/os-Linux/start_up.c | 4 +- arch/um/scripts/Makefile.rules | 10 +++- arch/x86/um/Makefile | 6 ++- arch/x86/um/os-Linux/Makefile | 5 +- arch/x86/um/os-Linux/registers.c | 20 ++------ arch/x86/um/user-offsets.c | 1 - tools/include/linux/compiler.h | 2 +- tools/include/nolibc/Makefile | 2 + tools/include/nolibc/arch-arm.h | 2 + tools/include/nolibc/arch-arm64.h | 2 + tools/include/nolibc/arch-loongarch.h | 2 + tools/include/nolibc/arch-m68k.h | 2 + tools/include/nolibc/arch-mips.h | 2 + tools/include/nolibc/arch-powerpc.h | 2 + tools/include/nolibc/arch-riscv.h | 2 + tools/include/nolibc/arch-s390.h | 2 + tools/include/nolibc/arch-sh.h | 2 + tools/include/nolibc/arch-sparc.h | 2 + tools/include/nolibc/arch-x86.h | 4 ++ tools/include/nolibc/compiler.h | 4 +- tools/include/nolibc/crt.h | 3 ++ tools/include/nolibc/dirent.h | 6 +-- tools/include/nolibc/nolibc.h | 2 + tools/include/nolibc/stackprotector.h | 2 + tools/include/nolibc/stdio.h | 10 +++- tools/include/nolibc/stdlib.h | 2 + tools/include/nolibc/sys.h | 3 +- tools/include/nolibc/sys/auxv.h | 3 ++ tools/include/nolibc/sys/ptrace.h | 44 ++++++++++++++++++ tools/include/nolibc/sys/uio.h | 49 ++++++++++++++++++++ tools/testing/selftests/nolibc/nolibc-test.c | 11 +++++ 39 files changed, 221 insertions(+), 53 deletions(-) create mode 100644 tools/include/nolibc/sys/ptrace.h create mode 100644 tools/include/nolibc/sys/uio.h -- 2.51.0
Powered by blists - more mailing lists