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([2804:1b3:a7c2:55a1:d59a:609a:284:6ed]) by smtp.gmail.com with ESMTPSA id r7-20020a9d7507000000b006a30260ccfdsm4673293otk.11.2023.04.10.12.59.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Apr 2023 12:59:14 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org Subject: [PATCH v5 02/22] x86_64: Fix Race conditions in pthread cancellation [BZ#12683] Date: Mon, 10 Apr 2023 16:58:47 -0300 Message-Id: <20230410195907.4123869-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230410195907.4123869-1-adhemerval.zanella@linaro.org> References: <20230410195907.4123869-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,KAM_SHORT,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: By adding the required syscall_cancel.S. Checked on x86_64-linux-gnu. --- .../unix/sysv/linux/x86_64/syscall_cancel.S | 57 +++++++++++++++++++ sysdeps/x86_64/nptl/tcb-offsets.sym | 3 - 2 files changed, 57 insertions(+), 3 deletions(-) create mode 100644 sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S diff --git a/sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S b/sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S new file mode 100644 index 0000000000..cda9d20a83 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S @@ -0,0 +1,57 @@ +/* Cancellable syscall wrapper. Linux/x86_64 version. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +/* long int [rax] __syscall_cancel_arch (volatile int *cancelhandling [%rdi], + __syscall_arg_t nr [%rsi], + __syscall_arg_t arg1 [%rdx], + __syscall_arg_t arg2 [%rcx], + __syscall_arg_t arg3 [%r8], + __syscall_arg_t arg4 [%r9], + __syscall_arg_t arg5 [SP+8], + __syscall_arg_t arg6 [SP+16]) */ + +ENTRY (__syscall_cancel_arch) + .globl __syscall_cancel_arch_start +__syscall_cancel_arch_start: + + /* if (*cancelhandling & CANCELED_BITMASK) + __syscall_do_cancel() */ + mov (%rdi),%eax + testb $TCB_CANCELED_BITMASK, (%rdi) + jne __syscall_do_cancel + + /* Issue a 6 argument syscall, the nr [%rax] being the syscall + number. */ + mov %rdi,%r11 + mov %rsi,%rax + mov %rdx,%rdi + mov %rcx,%rsi + mov %r8,%rdx + mov %r9,%r10 + mov 8(%rsp),%r8 + mov 16(%rsp),%r9 + mov %r11,8(%rsp) + syscall + + .globl __syscall_cancel_arch_end +__syscall_cancel_arch_end: + ret +END (__syscall_cancel_arch) diff --git a/sysdeps/x86_64/nptl/tcb-offsets.sym b/sysdeps/x86_64/nptl/tcb-offsets.sym index 2bbd563a6c..988a4b8593 100644 --- a/sysdeps/x86_64/nptl/tcb-offsets.sym +++ b/sysdeps/x86_64/nptl/tcb-offsets.sym @@ -13,6 +13,3 @@ MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads) POINTER_GUARD offsetof (tcbhead_t, pointer_guard) FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1) SSP_BASE_OFFSET offsetof (tcbhead_t, ssp_base) - --- Not strictly offsets, but these values are also used in the TCB. -TCB_CANCELED_BITMASK CANCELED_BITMASK -- 2.34.1