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Peter Anvin" To: Thomas Gleixner , Sebastian Andrzej Siewior CC: LKML , Peter Zijlstra , Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Sven Schnelle , linux-s390@vger.kernel.org, x86@kernel.org, Mark Rutland , Jinjie Ruan , Andy Lutomirski , Oleg Nesterov , Richard Henderson , Russell King , Catalin Marinas , Guo Ren , Geert Uytterhoeven , Thomas Bogendoerfer , Helge Deller , Yoshinori Sato , Richard Weinberger , Chris Zankel , linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org, linux-csky@vger.kernel.org, linux-m68k@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, Arnd Bergmann , Vineet Gupta , Will Deacon , Brian Cain , Michal Simek , Dinh Nguyen , "David S. Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?ISO-8859-1?Q?Michal_Such=E1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org Subject: =?US-ASCII?Q?Re=3A_=5Bpatch_16/18=5D_x86/entry=3A_Get_rid?= =?US-ASCII?Q?_of_the_sys=5Fni=5Fsyscall=28=29_indirection?= User-Agent: K-9 Mail for Android In-Reply-To: <871p9g1s3w.ffs@fw13> References: <20260707181957.433213175@kernel.org> <20260707190254.493733289@kernel.org> <20261022142425.3Wx-RrU5@linutronix.de> <87fqxx1r80.ffs@fw13> <87cxt11ktr.ffs@fw13> <1149A39E-BEBA-46EA-94F4-4DFFC4733EF5@zytor.com> <871p9g1s3w.ffs@fw13> Message-ID: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On October 23, 2026 6:09:07 AM PDT, Thomas Gleixner wro= te: >On Thu, Oct 22 2026 at 17:22, H=2E Peter Anvin wrote: >> On October 22, 2026 2:34:08 PM PDT, Thomas Gleixner = wrote: >>>-static __always_inline void do_syscall_x32(struct pt_regs *regs, unsig= ned long nr) >>>+static __always_inline bool do_syscall_x32(struct pt_regs *regs, unsig= ned long nr) >>> { >>>+ if (!IS_ENABLED(CONFIG_X86_X32_ABI)) >>>+ return false; >>>+ >>>+ /* Preserve the historic insanity of treating -1 special on x32 */ >>>+ if (nr =3D=3D ULONG_MAX) >>>+ return true; >> >> It was never limited to x32=2E=2E=2E > >Tired brain misread the test output: > >[RUN] Running tests under ptrace: modifying the default return >[RUN] Checking system calls with msb =3D 0 (0x0) >[OK] x32 syscalls 0:-64=2E=2E-2 returned -ENOSYS as expect= ed >[OK] x32 syscall 0:-1 returned MODIFIED_BY_PTRACE as expec= ted >[OK] x64 syscalls 0:-64=2E=2E-1 returned -ENOSYS as expect= ed > >But that's because the "-1" on x32 is actually 0xFFFFFFFF while on x64 >it's 0x7FFFFFFF=2E > >The whole mess comes from using -1 as indicator for syscall abort which >is undistinguishable from a syscall(nr=3D-1)=2E > >Bah=2E Let me restore this nonsense=2E > >Thanks, > > tglx > > > Yeah, that was always a WTF=2E