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[209.132.180.131]) by mx.google.com with ESMTPS id u12si13278292otq.51.2019.12.17.13.49.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Dec 2019 13:49:50 -0800 (PST) Received-SPF: pass (google.com: domain of libc-alpha-return-108175-patch=linaro.org@sourceware.org designates 209.132.180.131 as permitted sender) client-ip=209.132.180.131; Authentication-Results: mx.google.com; dkim=pass header.i=@sourceware.org header.s=default header.b="sNF/Xk41"; dkim=pass header.i=@linaro.org header.s=google header.b=SX9dAyYH; spf=pass (google.com: domain of libc-alpha-return-108175-patch=linaro.org@sourceware.org designates 209.132.180.131 as permitted sender) smtp.mailfrom="libc-alpha-return-108175-patch=linaro.org@sourceware.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:in-reply-to :references; q=dns; s=default; b=sISiQbi6ru2LHt/hiJv+g3yTXZUSYyT 9XgWovpNEugTZxQ/ukR+oNXy1mWgGOwNeSeYkyqgSHfnamayY2CpnBSCxKnRgZdi 8Oi/BOZ/3s6CX0b9leQwaNUs0TUcRxuK0pzCXDxrDX+O2ZwUdo0R0LbSEJBcuDoB 29ZJYw8yfvng= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:in-reply-to :references; s=default; bh=g+p3OcMmHE48Xv/CyRMVi30EuOI=; b=sNF/X k41WF2npoa/Jw0RBY81qJciCAFeeE2nja7bnZBcaogPGsdxA8dz000dTBzglzP61 HZKskmjtMBCU0P0pLkK2P+LRc92LDwNfKMgK/4t8k/TN3Yycvj3nFtd22y/VVOeW oOHSPv6INQfgQhFQhfXkOk4DzUD/P2BmX7oVKo= Received: (qmail 111787 invoked by alias); 17 Dec 2019 21:47:57 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 111690 invoked by uid 89); 17 Dec 2019 21:47:56 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-21.2 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, KAM_STOCKGEN, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.1 spammy=influence X-HELO: mail-pj1-f48.google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references; bh=zYn0VD5e3WpaFXB2hl+FueIghyxjmZ+igW+N3OQpWpM=; b=SX9dAyYHKKT0V0QaCPygx3GqAomu7TfVN86pJfeqLUM7aBiav0Z6kx79DNbnyNGN8K /lZ8yXrTnKx17IVQK8QcUJ8uUIBMiDWCynpDKSYn2pYIsoHPdSJI6NvAtT4ySp1TUyDL CraZIcX1GkRgdSvV87Pt0GNZwQD3u0Anypbi1HABGFDHnaj9JmnElHvDmDgKJbfuuMlw ZHtCfoUrU+Z3IBjOgLx3kxWDAHVT+Kwl5MEuKEfS+/K2H7FH53xCWAxykKXkKxofRvoa iT0bsn6uaTS4o311zkURO6HzeekJlxP9ll2BG/0SJh8Vd4GBDorOFZBUFCEVwUckpPIe CrFg== Return-Path: From: Adhemerval Zanella To: libc-alpha@sourceware.org Subject: [PATCH v3 09/16] elf: Move vDSO setup to rtld (BZ#24967) Date: Tue, 17 Dec 2019 18:47:21 -0300 Message-Id: <20191217214728.2886-9-adhemerval.zanella@linaro.org> In-Reply-To: <20191217214728.2886-1-adhemerval.zanella@linaro.org> References: <20191217214728.2886-1-adhemerval.zanella@linaro.org> Changes from previous version: - Do not GLRO access on ifunc resolver, ut rather call the vDSO resolve function instead (dl_vdso_vsym). -- This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. --- csu/init-first.c | 4 - elf/dl-support.c | 7 ++ elf/rtld.c | 7 +- malloc/tst-interpose-aux.c | 5 ++ sysdeps/generic/dl-vdso-setup.c | 1 + sysdeps/generic/dl-vdso-setup.h | 28 ++++++ sysdeps/generic/dl-vdso.h | 30 +++++++ sysdeps/generic/ldsodefs.h | 6 ++ sysdeps/powerpc/powerpc32/backtrace.c | 16 ++-- sysdeps/powerpc/powerpc64/backtrace.c | 8 +- sysdeps/unix/sysv/linux/aarch64/Makefile | 1 - sysdeps/unix/sysv/linux/arm/Makefile | 1 - sysdeps/unix/sysv/linux/dl-vdso-setup.c | 81 +++++++++++++++++ sysdeps/unix/sysv/linux/dl-vdso-setup.h | 55 ++++++++++++ sysdeps/unix/sysv/linux/dl-vdso.c | 48 ---------- sysdeps/unix/sysv/linux/dl-vdso.h | 30 ++++--- sysdeps/unix/sysv/linux/gettimeofday.c | 3 +- sysdeps/unix/sysv/linux/init-first.c | 90 ------------------- sysdeps/unix/sysv/linux/libc-vdso.h | 30 +------ sysdeps/unix/sysv/linux/mips/Makefile | 2 - sysdeps/unix/sysv/linux/powerpc/Makefile | 1 - .../sysv/linux/powerpc/get_timebase_freq.c | 5 +- sysdeps/unix/sysv/linux/powerpc/init-first.c | 50 ----------- sysdeps/unix/sysv/linux/powerpc/libc-vdso.h | 10 --- sysdeps/unix/sysv/linux/riscv/Makefile | 4 - sysdeps/unix/sysv/linux/riscv/flush-icache.c | 2 +- sysdeps/unix/sysv/linux/s390/Makefile | 4 - sysdeps/unix/sysv/linux/sparc/Makefile | 4 - sysdeps/unix/sysv/linux/sysdep-vdso.h | 6 +- sysdeps/unix/sysv/linux/time.c | 3 +- sysdeps/unix/sysv/linux/x86/Makefile | 4 - 31 files changed, 257 insertions(+), 289 deletions(-) create mode 100644 sysdeps/generic/dl-vdso-setup.c create mode 100644 sysdeps/generic/dl-vdso-setup.h create mode 100644 sysdeps/generic/dl-vdso.h create mode 100644 sysdeps/unix/sysv/linux/dl-vdso-setup.c create mode 100644 sysdeps/unix/sysv/linux/dl-vdso-setup.h delete mode 100644 sysdeps/unix/sysv/linux/dl-vdso.c delete mode 100644 sysdeps/unix/sysv/linux/init-first.c delete mode 100644 sysdeps/unix/sysv/linux/powerpc/init-first.c -- 2.17.1 diff --git a/csu/init-first.c b/csu/init-first.c index e0f489ee6d..891719a839 100644 --- a/csu/init-first.c +++ b/csu/init-first.c @@ -74,10 +74,6 @@ _init (int argc, char **argv, char **envp) _dl_non_dynamic_init (); #endif -#ifdef VDSO_SETUP - VDSO_SETUP (); -#endif - __init_misc (argc, argv, envp); /* Initialize ctype data. */ diff --git a/elf/dl-support.c b/elf/dl-support.c index b2b1b12f6f..81d44b0343 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -34,6 +34,8 @@ #include #include #include +#include +#include extern char *__progname; char **_dl_argv = &__progname; /* This is checked for some error messages. */ @@ -201,6 +203,8 @@ struct link_map *_dl_sysinfo_map; # include "get-dynamic-info.h" #endif #include "setup-vdso.h" +/* Define the vDSO function pointers. */ +#include /* During the program run we must not modify the global data of loaded shared object simultanously in two threads. Therefore we @@ -315,6 +319,9 @@ _dl_non_dynamic_init (void) so they can influence _dl_init_paths. */ setup_vdso (NULL, NULL); + /* With vDSO setup we can initialize the function pointers. */ + setup_vdso_pointers (); + /* Initialize the data structures for the search paths for shared objects. */ _dl_init_paths (getenv ("LD_LIBRARY_PATH")); diff --git a/elf/rtld.c b/elf/rtld.c index dd8fc5e6c6..a06e13c657 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -39,6 +39,8 @@ #include #include #include +#include +#include #include #include #include @@ -833,7 +835,7 @@ security_init (void) _dl_random = NULL; } -#include "setup-vdso.h" +#include /* The library search path. */ static const char *library_path attribute_relro; @@ -1538,6 +1540,9 @@ ERROR: '%s': cannot process note segment.\n", _dl_argv[0]); so they can influence _dl_init_paths. */ setup_vdso (main_map, &first_preload); + /* With vDSO setup we can initialize the function pointers. */ + setup_vdso_pointers (); + #ifdef DL_SYSDEP_OSCHECK DL_SYSDEP_OSCHECK (_dl_fatal_printf); #endif diff --git a/malloc/tst-interpose-aux.c b/malloc/tst-interpose-aux.c index bbe321e843..8cbc3e6fea 100644 --- a/malloc/tst-interpose-aux.c +++ b/malloc/tst-interpose-aux.c @@ -28,6 +28,7 @@ #include #include #include +#include #if INTERPOSE_THREADS #include @@ -96,6 +97,7 @@ struct __attribute__ ((aligned (__alignof__ (max_align_t)))) allocation_header { size_t allocation_index; size_t allocation_size; + struct timespec ts; }; /* Array of known allocations, to track invalid frees. */ @@ -166,6 +168,9 @@ malloc_internal (size_t size) .allocation_index = index, .allocation_size = allocation_size }; + /* BZ#24967: Check if calling a symbol which may use the vDSO does not fail. + The CLOCK_REALTIME should be supported on all systems. */ + clock_gettime (CLOCK_REALTIME, &allocations[index]->ts); return allocations[index] + 1; } diff --git a/sysdeps/generic/dl-vdso-setup.c b/sysdeps/generic/dl-vdso-setup.c new file mode 100644 index 0000000000..6e25b021ab --- /dev/null +++ b/sysdeps/generic/dl-vdso-setup.c @@ -0,0 +1 @@ +/* Empty. */ diff --git a/sysdeps/generic/dl-vdso-setup.h b/sysdeps/generic/dl-vdso-setup.h new file mode 100644 index 0000000000..3d79bae317 --- /dev/null +++ b/sysdeps/generic/dl-vdso-setup.h @@ -0,0 +1,28 @@ +/* ELF symbol initialization functions for VDSO objects. + Copyright (C) 2019 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 + . */ + +#ifndef _DL_VDSO_INIT_H +#define _DL_VDSO_INIT_H + +/* Initialize the VDSO functions pointers. */ +static inline void __attribute__ ((always_inline)) +setup_vdso_pointers (void) +{ +} + +#endif diff --git a/sysdeps/generic/dl-vdso.h b/sysdeps/generic/dl-vdso.h new file mode 100644 index 0000000000..5651f49a1a --- /dev/null +++ b/sysdeps/generic/dl-vdso.h @@ -0,0 +1,30 @@ +/* ELF symbol resolve functions for VDSO objects. + Copyright (C) 2019 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 + . */ + +#ifndef _DL_VDSO_H +#define _DL_VDSO_H 1 + +/* Function for resolving symbols in the VDSO link map. Return the + address of the vdso symbol NAME. */ +static inline void * +dl_vdso_vsym (const char *name) +{ + return NULL; +} + +#endif diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index fc25a81e1c..8cbd0e87cc 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -608,6 +608,12 @@ struct rtld_global_ro /* At startup time we set up the normal DSO data structure for it, and this points to it. */ EXTERN struct link_map *_dl_sysinfo_map; + +# define PROCINFO_DECL +# ifndef PROCINFO_CLASS +# define PROCINFO_CLASS EXTERN +# endif +# include #endif /* Mask for more hardware capabilities that are available on some diff --git a/sysdeps/powerpc/powerpc32/backtrace.c b/sysdeps/powerpc/powerpc32/backtrace.c index 2e6a859d9f..f2a57480a5 100644 --- a/sysdeps/powerpc/powerpc32/backtrace.c +++ b/sysdeps/powerpc/powerpc32/backtrace.c @@ -51,14 +51,14 @@ struct signal_frame_32 { /* We don't care about the rest, since IP value is at 'mctx' field. */ }; -static inline int +static inline bool is_sigtramp_address (void *nip) { #ifdef HAVE_SIGTRAMP_RT32 - if (nip == VDSO_SYMBOL (sigtramp32)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_32)) + return true; #endif - return 0; + return false; } struct rt_signal_frame_32 { @@ -68,14 +68,14 @@ struct rt_signal_frame_32 { /* We don't care about the rest, since IP value is at 'uc' field. */ }; -static inline int +static inline bool is_sigtramp_address_rt (void * nip) { #ifdef HAVE_SIGTRAMP_32 - if (nip == VDSO_SYMBOL (sigtramp_rt32)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_rt32)) + return true; #endif - return 0; + return false; } int diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c index 234d9c00dc..8ed5bc1585 100644 --- a/sysdeps/powerpc/powerpc64/backtrace.c +++ b/sysdeps/powerpc/powerpc64/backtrace.c @@ -54,14 +54,14 @@ struct signal_frame_64 { /* We don't care about the rest, since the IP value is at 'uc' field. */ }; -static inline int +static inline bool is_sigtramp_address (void *nip) { #ifdef HAVE_SIGTRAMP_RT64 - if (nip == VDSO_SYMBOL (sigtramp_rt64)) - return 1; + if (nip == GLRO (dl_vdso_sigtramp_rt64)) + return true; #endif - return 0; + return false; } int diff --git a/sysdeps/unix/sysv/linux/aarch64/Makefile b/sysdeps/unix/sysv/linux/aarch64/Makefile index 57bbfeaac6..4bcae85bca 100644 --- a/sysdeps/unix/sysv/linux/aarch64/Makefile +++ b/sysdeps/unix/sysv/linux/aarch64/Makefile @@ -5,7 +5,6 @@ shared-only-routines += libc-__read_tp endif ifeq ($(subdir),elf) -sysdep_routines += dl-vdso sysdep-rtld-routines += __read_tp ifeq ($(build-shared),yes) # This is needed for DSO loading from static binaries. diff --git a/sysdeps/unix/sysv/linux/arm/Makefile b/sysdeps/unix/sysv/linux/arm/Makefile index d7a2f6a8a7..abdf01f00c 100644 --- a/sysdeps/unix/sysv/linux/arm/Makefile +++ b/sysdeps/unix/sysv/linux/arm/Makefile @@ -1,5 +1,4 @@ ifeq ($(subdir),elf) -sysdep_routines += dl-vdso sysdep-rtld-routines += aeabi_read_tp libc-do-syscall endif diff --git a/sysdeps/unix/sysv/linux/dl-vdso-setup.c b/sysdeps/unix/sysv/linux/dl-vdso-setup.c new file mode 100644 index 0000000000..1069879f1a --- /dev/null +++ b/sysdeps/unix/sysv/linux/dl-vdso-setup.c @@ -0,0 +1,81 @@ +/* Data for vDSO support. Linux version. + Copyright (C) 2019 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 + . */ + +/* This file is included in three different modes for both static (libc.a) + and shared (rtld) modes: + + 1. PROCINFO_DECL is defined, meaning we are only interested in + declarations. For static it requires use the extern keywork along with + the attribute_relro while for shared it will be embedded in the + rtld_global_ro. + + 2. PROCINFO_DECL and SHARED are not defined. Nothing to do, the default + zero initializion is suffice. + + 3. PROCINFO_DECL is not defined while SHARED is. Similar to 2., the zero + initialization of rtld_global_ro is suffice. */ + +#ifndef PROCINFO_CLASS +# define PROCINFO_CLASS +#endif + +#ifndef SHARED +# define RELRO attribute_relro +#else +# define RELRO +#endif + +#if defined PROCINFO_DECL || !defined SHARED +# ifdef HAVE_CLOCK_GETTIME_VSYSCALL +PROCINFO_CLASS int (*_dl_vdso_clock_gettime) (clockid_t, + struct timespec *) RELRO; +#endif +# ifdef HAVE_GETTIMEOFDAY_VSYSCALL +PROCINFO_CLASS int (*_dl_vdso_gettimeofday) (struct timeval *, void *) RELRO; +#endif +# ifdef HAVE_TIME_VSYSCALL +PROCINFO_CLASS time_t (*_dl_vdso_time) (time_t *) RELRO; +# endif +# ifdef HAVE_GETCPU_VSYSCALL +PROCINFO_CLASS int (*_dl_vdso_getcpu) (unsigned *, unsigned *, void *) RELRO; +# endif +# ifdef HAVE_CLOCK_GETRES_VSYSCALL +PROCINFO_CLASS int (*_dl_vdso_clock_getres) (clockid_t, + struct timespec *) RELRO; +# endif + +/* PowerPC specific ones. */ +# ifdef HAVE_GET_TBFREQ +PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO; +# endif +/* The sigtramp are used on powerpc backtrace without using + INLINE_VSYSCALL, so there is no need to set their type. */ +# ifdef HAVE_SIGTRAMP_RT64 +PROCINFO_CLASS void *_dl_vdso_sigtramp_rt64 RELRO; +# endif +# ifdef HAVE_SIGTRAMP_RT32 +PROCINFO_CLASS void *_dl_vdso_sigtramp_rt32 RELRO; +# endif +# ifdef HAVE_SIGTRAMP_32 +PROCINFO_CLASS void *_dl_vdso_sigtramp_32 RELRO; +# endif +#endif + +#undef RELRO +#undef PROCINFO_DECL +#undef PROCINFO_CLASS diff --git a/sysdeps/unix/sysv/linux/dl-vdso-setup.h b/sysdeps/unix/sysv/linux/dl-vdso-setup.h new file mode 100644 index 0000000000..f4e76202fc --- /dev/null +++ b/sysdeps/unix/sysv/linux/dl-vdso-setup.h @@ -0,0 +1,55 @@ +/* ELF symbol initialization functions for VDSO objects. Linux version. + Copyright (C) 2019 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 + . */ + +#ifndef _DL_VDSO_INIT_H +#define _DL_VDSO_INIT_H + +/* Initialize the VDSO functions pointers. */ +static inline void __attribute__ ((always_inline)) +setup_vdso_pointers (void) +{ +#ifdef HAVE_CLOCK_GETTIME_VSYSCALL + GLRO(dl_vdso_clock_gettime) = dl_vdso_vsym (HAVE_CLOCK_GETTIME_VSYSCALL); +#endif +#ifdef HAVE_GETTIMEOFDAY_VSYSCALL + GLRO(dl_vdso_gettimeofday) = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL); +#endif +#ifdef HAVE_TIME_VSYSCALL + GLRO(dl_vdso_time) = dl_vdso_vsym (HAVE_TIME_VSYSCALL); +#endif +#ifdef HAVE_GETCPU_VSYSCALL + GLRO(dl_vdso_getcpu) = dl_vdso_vsym (HAVE_GETCPU_VSYSCALL); +#endif +#ifdef HAVE_CLOCK_GETRES_VSYSCALL + GLRO(dl_vdso_clock_getres) = dl_vdso_vsym (HAVE_CLOCK_GETRES_VSYSCALL); +#endif +#ifdef HAVE_GET_TBFREQ + GLRO(dl_vdso_get_tbfreq) = dl_vdso_vsym (HAVE_GET_TBFREQ); +#endif +#ifdef HAVE_SIGTRAMP_RT64 + GLRO(dl_vdso_sigtramp_rt64) = dl_vdso_vsym (HAVE_SIGTRAMP_RT64); +#endif +#ifdef HAVE_SIGTRAMP_RT32 + GLRO(dl_vdso_sigtramp_rt32) = dl_vdso_vsym (HAVE_SIGTRAMP_RT32); +#endif +#ifdef HAVE_SIGTRAMP_32 + GLRO(dl_vdso_sigtramp_32) = dl_vdso_vsym (HAVE_SIGTRAMP_32); +#endif +} + +#endif diff --git a/sysdeps/unix/sysv/linux/dl-vdso.c b/sysdeps/unix/sysv/linux/dl-vdso.c deleted file mode 100644 index 5577f2103c..0000000000 --- a/sysdeps/unix/sysv/linux/dl-vdso.c +++ /dev/null @@ -1,48 +0,0 @@ -/* ELF symbol resolve functions for VDSO objects. - Copyright (C) 2005-2019 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 "config.h" -#include - - -void * -_dl_vdso_vsym (const char *name, const struct r_found_version *vers) -{ - struct link_map *map = GLRO (dl_sysinfo_map); - void *value = NULL; - - - if (map != NULL) - { - /* Use a WEAK REF so we don't error out if the symbol is not found. */ - ElfW (Sym) wsym; - memset (&wsym, 0, sizeof (ElfW (Sym))); - wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE)); - - /* Search the scope of the vdso map. */ - const ElfW (Sym) *ref = &wsym; - lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref, - map->l_local_scope, - vers, 0, 0, NULL); - - if (ref != NULL) - value = DL_SYMBOL_ADDRESS (result, ref); - } - - return value; -} diff --git a/sysdeps/unix/sysv/linux/dl-vdso.h b/sysdeps/unix/sysv/linux/dl-vdso.h index 19ffd30c7e..d1e782b81f 100644 --- a/sysdeps/unix/sysv/linux/dl-vdso.h +++ b/sysdeps/unix/sysv/linux/dl-vdso.h @@ -22,11 +22,6 @@ #include #include -/* Functions for resolving symbols in the VDSO link map. */ -extern void *_dl_vdso_vsym (const char *name, - const struct r_found_version *version) - attribute_hidden; - /* If the architecture support vDSO it should define which is the expected kernel version and hash value through both VDSO_NAME and VDSO_HASH (usually defined at architecture sysdep.h). */ @@ -38,19 +33,26 @@ extern void *_dl_vdso_vsym (const char *name, # define VDSO_HASH 0 #endif +/* Functions for resolving symbols in the VDSO link map. */ static inline void * -get_vdso_symbol (const char *symbol) +dl_vdso_vsym (const char *name) { + struct link_map *map = GLRO (dl_sysinfo_map); + if (map == NULL) + return NULL; + + /* Use a WEAK REF so we don't error out if the symbol is not found. */ + ElfW (Sym) wsym = { 0 }; + wsym.st_info = (unsigned char) ELFW (ST_INFO (STB_WEAK, STT_NOTYPE)); + struct r_found_version rfv = { VDSO_NAME, VDSO_HASH, 1, NULL }; - return _dl_vdso_vsym (symbol, &rfv); -} -static inline void * -get_vdso_mangle_symbol (const char *symbol) -{ - void *vdsop = get_vdso_symbol (symbol); - PTR_MANGLE (vdsop); - return vdsop; + /* Search the scope of the vdso map. */ + const ElfW (Sym) *ref = &wsym; + lookup_t result = GLRO (dl_lookup_symbol_x) (name, map, &ref, + map->l_local_scope, + &rfv, 0, 0, NULL); + return ref != NULL ? DL_SYMBOL_ADDRESS (result, ref) : NULL; } #endif /* dl-vdso.h */ diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c index 600da6b468..6945be269c 100644 --- a/sysdeps/unix/sysv/linux/gettimeofday.c +++ b/sysdeps/unix/sysv/linux/gettimeofday.c @@ -25,6 +25,7 @@ # ifdef SHARED # include +# include static int __gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz) @@ -36,7 +37,7 @@ __gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz) # undef INIT_ARCH # define INIT_ARCH() \ - void *vdso_gettimeofday = get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL) + void *vdso_gettimeofday = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL) libc_ifunc (__gettimeofday, vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday) : (void *) __gettimeofday_syscall) diff --git a/sysdeps/unix/sysv/linux/init-first.c b/sysdeps/unix/sysv/linux/init-first.c deleted file mode 100644 index d005d13322..0000000000 --- a/sysdeps/unix/sysv/linux/init-first.c +++ /dev/null @@ -1,90 +0,0 @@ -/* vDSO internal symbols. Linux generic version. - Copyright (C) 2019 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 - -/* vDSO symbol used on clock_gettime implementation. */ -#ifdef HAVE_CLOCK_GETTIME_VSYSCALL -int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *) - attribute_hidden; -#endif -/* vDSO symbol used on clock_gettime64 implementation. */ -#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL -int (*VDSO_SYMBOL(clock_gettime64)) (clockid_t, struct __timespec64 *) - attribute_hidden; -#endif -/* vDSO symbol used on clock_getres implementation. */ -#ifdef HAVE_CLOCK_GETRES_VSYSCALL -int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *) - attribute_hidden; -#endif -/* vDSO symbol used on gettimeofday implementation. */ -#ifdef HAVE_GETTIMEOFDAY_VSYSCALL -int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *) - attribute_hidden; -#endif -/* vDSO symbol used on GNU extension getcpu implementation. */ -#ifdef HAVE_GETCPU_VSYSCALL -long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *) - attribute_hidden; -#endif -/* vDSO symbol used on time implementation. */ -#ifdef HAVE_TIME_VSYSCALL -time_t (*VDSO_SYMBOL(time)) (time_t *) attribute_hidden; -#endif - -static inline void -__libc_vdso_platform_setup (void) -{ -#ifdef HAVE_CLOCK_GETTIME_VSYSCALL - VDSO_SYMBOL(clock_gettime) - = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME_VSYSCALL); -#endif - -#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL - VDSO_SYMBOL(clock_gettime64) - = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME64_VSYSCALL); -#endif - -#ifdef HAVE_CLOCK_GETRES_VSYSCALL - VDSO_SYMBOL(clock_getres) - = get_vdso_mangle_symbol (HAVE_CLOCK_GETRES_VSYSCALL); -#endif - -#ifdef HAVE_GETTIMEOFDAY_VSYSCALL - VDSO_SYMBOL(gettimeofday) - = get_vdso_mangle_symbol (HAVE_GETTIMEOFDAY_VSYSCALL); -#endif - -#ifdef HAVE_GETCPU_VSYSCALL - VDSO_SYMBOL(getcpu) = get_vdso_mangle_symbol (HAVE_GETCPU_VSYSCALL); -#endif - -#ifdef HAVE_TIME_VSYSCALL - VDSO_SYMBOL(time) = get_vdso_mangle_symbol (HAVE_TIME_VSYSCALL); -#endif - -#ifdef VDSO_SETUP_ARCH - VDSO_SETUP_ARCH (); -#endif -} - -#define VDSO_SETUP __libc_vdso_platform_setup - -#include diff --git a/sysdeps/unix/sysv/linux/libc-vdso.h b/sysdeps/unix/sysv/linux/libc-vdso.h index c6d505bab3..004faf0a97 100644 --- a/sysdeps/unix/sysv/linux/libc-vdso.h +++ b/sysdeps/unix/sysv/linux/libc-vdso.h @@ -19,37 +19,9 @@ #ifndef _LIBC_VDSO_H #define _LIBC_VDSO_H -#define VDSO_SYMBOL(__name) __vdso_##__name - /* Adjust the return IFUNC value from a vDSO symbol accordingly required by the ELFv1 ABI. It is used by the architecture to create an ODP entry since the kernel vDSO does not provide it. */ -#ifndef VDSO_IFUNC_RET -# define VDSO_IFUNC_RET(__value) (__value) -#endif +#define VDSO_IFUNC_RET(__value) (__value) -#ifdef HAVE_CLOCK_GETTIME_VSYSCALL -extern int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *) - attribute_hidden; -#endif -#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL -extern int (*VDSO_SYMBOL(clock_gettime64)) (clockid_t, struct __timespec64 *) - attribute_hidden; -#endif -#ifdef HAVE_CLOCK_GETRES_VSYSCALL -extern int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *) - attribute_hidden; #endif -#ifdef HAVE_GETTIMEOFDAY_VSYSCALL -extern int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *) - attribute_hidden; -#endif -#ifdef HAVE_GETCPU_VSYSCALL -extern long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *) - attribute_hidden; -#endif -#ifdef HAVE_TIME_VSYSCALL -extern time_t (*VDSO_SYMBOL(time)) (time_t *) attribute_hidden; -#endif - -#endif /* _LIBC_VDSO_H */ diff --git a/sysdeps/unix/sysv/linux/mips/Makefile b/sysdeps/unix/sysv/linux/mips/Makefile index 03044e7365..026ba242cf 100644 --- a/sysdeps/unix/sysv/linux/mips/Makefile +++ b/sysdeps/unix/sysv/linux/mips/Makefile @@ -60,8 +60,6 @@ ifeq ($(subdir),elf) ifeq ($(build-shared),yes) # This is needed for DSO loading from static binaries. sysdep-dl-routines += dl-static - -sysdep_routines += dl-vdso endif # If the compiler doesn't use GNU.stack note, # this test is expected to fail. diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile index 1596238afa..cc2f804d86 100644 --- a/sysdeps/unix/sysv/linux/powerpc/Makefile +++ b/sysdeps/unix/sysv/linux/powerpc/Makefile @@ -13,7 +13,6 @@ gen-as-const-headers += ucontext_i.sym endif ifeq ($(subdir),elf) -sysdep_routines += dl-vdso ifeq ($(build-shared),yes) # This is needed for DSO loading from static binaries. sysdep-dl-routines += dl-static diff --git a/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c index 29b6624b9a..11eb2b126d 100644 --- a/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c +++ b/sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c @@ -21,7 +21,7 @@ #include #include -#include +#include static uint64_t get_timebase_freq_fallback (void) @@ -101,8 +101,7 @@ uint64_t __get_timebase_freq (void) { /* The vDSO does not have a fallback mechanism (such calling a syscall). */ - __typeof (VDSO_SYMBOL (get_tbfreq)) vdsop = VDSO_SYMBOL (get_tbfreq); - PTR_DEMANGLE (vdsop); + uint64_t (*vdsop)(void) = GLRO(dl_vdso_get_tbfreq); if (vdsop == NULL) return get_timebase_freq_fallback (); diff --git a/sysdeps/unix/sysv/linux/powerpc/init-first.c b/sysdeps/unix/sysv/linux/powerpc/init-first.c deleted file mode 100644 index 92a4af83af..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/init-first.c +++ /dev/null @@ -1,50 +0,0 @@ -/* Initialization code run first thing by the ELF startup code. Linux/PowerPC. - Copyright (C) 2007-2019 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 - -unsigned long long (*VDSO_SYMBOL(get_tbfreq)) (void) attribute_hidden; -#if defined(__PPC64__) || defined(__powerpc64__) -void *VDSO_SYMBOL(sigtramp_rt64) attribute_hidden; -#else -void *VDSO_SYMBOL(sigtramp32) attribute_hidden; -void *VDSO_SYMBOL(sigtramp_rt32) attribute_hidden; -#endif - -static inline void -__libc_vdso_platform_setup_arch (void) -{ - VDSO_SYMBOL (get_tbfreq) = get_vdso_mangle_symbol (HAVE_GET_TBFREQ); - - /* PPC64 uses only one signal trampoline symbol, while PPC32 will use - two depending if SA_SIGINFO is used (__kernel_sigtramp_rt32) or not - (__kernel_sigtramp32). - There is no need to pointer mangle these symbol because they will - used only for pointer comparison. */ -#if defined(__PPC64__) || defined(__powerpc64__) - VDSO_SYMBOL(sigtramp_rt64) = get_vdso_symbol (HAVE_SIGTRAMP_RT64); -#else - VDSO_SYMBOL(sigtramp32) = get_vdso_symbol (HAVE_SIGTRAMP_32); - VDSO_SYMBOL(sigtramp_rt32) = get_vdso_symbol (HAVE_SIGTRAMP_RT32); -#endif -} - -#define VDSO_SETUP_ARCH __libc_vdso_platform_setup_arch - -#include diff --git a/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h b/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h index cb7da3b289..adc06d48b0 100644 --- a/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h +++ b/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h @@ -54,14 +54,4 @@ # define VDSO_IFUNC_RET(value) ((void *) (value)) #endif -#include_next - -extern unsigned long long (*VDSO_SYMBOL(get_tbfreq)) (void); -#if defined(__PPC64__) || defined(__powerpc64__) -extern void *VDSO_SYMBOL(sigtramp_rt64); -#else -extern void *VDSO_SYMBOL(sigtramp32); -extern void *VDSO_SYMBOL(sigtramp_rt32); -#endif - #endif /* _LIBC_VDSO_H */ diff --git a/sysdeps/unix/sysv/linux/riscv/Makefile b/sysdeps/unix/sysv/linux/riscv/Makefile index b7ad31885c..301b082398 100644 --- a/sysdeps/unix/sysv/linux/riscv/Makefile +++ b/sysdeps/unix/sysv/linux/riscv/Makefile @@ -1,7 +1,3 @@ -ifeq ($(subdir),elf) -sysdep_routines += dl-vdso -endif - ifeq ($(subdir),misc) sysdep_headers += sys/cachectl.h sysdep_routines += flush-icache diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c index c5bd60d9c2..e967e40deb 100644 --- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c +++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c @@ -38,7 +38,7 @@ __riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags) static func_type __lookup_riscv_flush_icache (void) { - func_type func = get_vdso_symbol ("__vdso_flush_icache"); + func_type func = dl_vdso_vsym ("__vdso_flush_icache"); /* If there is no vDSO entry then call the system call directly. All Linux versions provide the vDSO entry, but QEMU's user-mode emulation doesn't diff --git a/sysdeps/unix/sysv/linux/s390/Makefile b/sysdeps/unix/sysv/linux/s390/Makefile index 77f38523b5..d9db1b5422 100644 --- a/sysdeps/unix/sysv/linux/s390/Makefile +++ b/sysdeps/unix/sysv/linux/s390/Makefile @@ -11,10 +11,6 @@ ifeq ($(subdir),stdlib) gen-as-const-headers += ucontext_i.sym endif -ifeq ($(subdir),elf) -sysdep_routines += dl-vdso -endif - ifeq ($(subdir),nptl) libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \ elision-trylock diff --git a/sysdeps/unix/sysv/linux/sparc/Makefile b/sysdeps/unix/sysv/linux/sparc/Makefile index fb3ee5b8a1..b0d182a439 100644 --- a/sysdeps/unix/sysv/linux/sparc/Makefile +++ b/sysdeps/unix/sysv/linux/sparc/Makefile @@ -7,10 +7,6 @@ librt-routines += rt-sysdep librt-shared-only-routines += rt-sysdep endif -ifeq ($(subdir),elf) -sysdep_routines += dl-vdso -endif - ifeq ($(subdir),sysvipc) sysdep_routines += getshmlba endif diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index 76a211e39b..772313f97e 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -19,8 +19,7 @@ #ifndef SYSDEP_VDSO_LINUX_H # define SYSDEP_VDSO_LINUX_H -#include -#include +#include #ifndef INTERNAL_VSYSCALL_CALL # define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \ @@ -34,8 +33,7 @@ INTERNAL_SYSCALL_DECL (sc_err); \ long int sc_ret; \ \ - __typeof (__vdso_##name) vdsop = __vdso_##name; \ - PTR_DEMANGLE (vdsop); \ + __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \ if (vdsop != NULL) \ { \ sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, sc_err, nr, ##args); \ diff --git a/sysdeps/unix/sysv/linux/time.c b/sysdeps/unix/sysv/linux/time.c index 0598958c9c..a7e4cbeb96 100644 --- a/sysdeps/unix/sysv/linux/time.c +++ b/sysdeps/unix/sysv/linux/time.c @@ -25,6 +25,7 @@ #ifdef SHARED # include +# include static time_t time_syscall (time_t *t) @@ -34,7 +35,7 @@ time_syscall (time_t *t) # undef INIT_ARCH # define INIT_ARCH() \ - void *vdso_time = get_vdso_symbol (HAVE_TIME_VSYSCALL); + void *vdso_time = dl_vdso_vsym (HAVE_TIME_VSYSCALL); libc_ifunc (time, vdso_time ? VDSO_IFUNC_RET (vdso_time) : (void *) time_syscall); diff --git a/sysdeps/unix/sysv/linux/x86/Makefile b/sysdeps/unix/sysv/linux/x86/Makefile index 02ca36c6d2..b23b532590 100644 --- a/sysdeps/unix/sysv/linux/x86/Makefile +++ b/sysdeps/unix/sysv/linux/x86/Makefile @@ -20,10 +20,6 @@ CFLAGS-elision-timed.c += -mrtm CFLAGS-elision-trylock.c += -mrtm endif -ifeq ($(subdir),elf) -sysdep_routines += dl-vdso -endif - ifeq ($(subdir),setjmp) tests += tst-saved_mask-1 endif