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([2804:1b3:a7c0:a715:15ac:c4b6:7a0e:f5c5]) by smtp.gmail.com with ESMTPSA id w11-20020a5b08cb000000b00da034601e2esm1888100ybq.52.2023.11.01.05.56.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Nov 2023 05:56:21 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org, DJ Delorie , Ian Rogers , Francesco Nigro , Carlos O'Donell Subject: [PATCH v3 2/7] support: Add support_set_vma_name Date: Wed, 1 Nov 2023 09:56:06 -0300 Message-Id: <20231101125611.208544-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231101125611.208544-1-adhemerval.zanella@linaro.org> References: <20231101125611.208544-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.0 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, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patch=linaro.org@sourceware.org Check if kernel supports prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, ...). Reviewed-by: DJ Delorie --- support/Makefile | 1 + support/support.h | 4 ++ support/support_set_vma_name_supported.c | 49 ++++++++++++++++++++++++ 3 files changed, 54 insertions(+) create mode 100644 support/support_set_vma_name_supported.c diff --git a/support/Makefile b/support/Makefile index 917a858bd1..9aa7f23a6e 100644 --- a/support/Makefile +++ b/support/Makefile @@ -80,6 +80,7 @@ libsupport-routines = \ support_select_modifies_timeout \ support_select_normalizes_timeout \ support_set_small_thread_stack_size \ + support_set_vma_name_supported \ support_shared_allocate \ support_small_stack_thread_attribute \ support_socket_so_timestamp_time64 \ diff --git a/support/support.h b/support/support.h index b7f76bf080..4a068d3aee 100644 --- a/support/support.h +++ b/support/support.h @@ -235,6 +235,10 @@ void support_stack_free (struct support_stack *stack); The returned value is the lowest file descriptor number. */ int support_open_dev_null_range (int num, int flags, mode_t mode); + +/* Check if kernel supports set VMA range name. */ +extern bool support_set_vma_name_supported (void); + __END_DECLS #endif /* SUPPORT_H */ diff --git a/support/support_set_vma_name_supported.c b/support/support_set_vma_name_supported.c new file mode 100644 index 0000000000..712caa9b9b --- /dev/null +++ b/support/support_set_vma_name_supported.c @@ -0,0 +1,49 @@ +/* Check if kernel supports set VMA range name. + 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 +#include +#include +#ifdef __linux__ +# include +#endif + +bool +support_set_vma_name_supported (void) +{ +#ifdef __linux__ + size_t size = sysconf (_SC_PAGESIZE); + if (size == -1) + FAIL_EXIT1 ("sysconf (_SC_PAGESIZE): %m\n"); + + void *vma = xmmap (0, + size, + PROT_NONE, + MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, + -1); + + int r = prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, vma, size, "vmaname"); + + xmunmap (vma, size); + + return r == 0; +#else + return false; +#endif +}