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([2804:431:c7ca:cb36:ae42:babb:bfa3:4f13]) by smtp.gmail.com with ESMTPSA id y2sm21352103oao.10.2022.02.21.09.59.27 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Feb 2022 09:59:28 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org Subject: [PATCH 1/2] Remove kernel version check Date: Mon, 21 Feb 2022 14:59:21 -0300 Message-Id: <20220221175922.3909198-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220221175922.3909198-1-adhemerval.zanella@linaro.org> References: <20220221175922.3909198-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-11.1 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, T_SCC_BODY_TEXT_LINE, URIBL_BLACK autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Feb 2022 17:59:34 -0000 The kernel version check is used to avoid glibc to run on older kernels where some syscall are not available and fallback code are not enabled to handle graciously fail. However, it does not prevent if the kernel does not correctly advertise its version through vDSO note, uname or procfs. Also kernel version checks are sometime not desirable by users, where they want to deploy on different system with different kernel version knowing the minimum set of syscall is always presented on such systems. The kernel version check has been removed along with the LD_ASSUME_KERNEL environment variable. The minimum kernel used to built glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed when libc.so is issued. Checked on x86_64-linux-gnu. --- NEWS | 5 ++ config.h.in | 3 + csu/libc-start.c | 8 -- csu/version.c | 3 + elf/dl-cache.c | 3 - elf/dl-diagnostics.c | 5 -- elf/dl-load.c | 30 ++++--- elf/dl-support.c | 4 - elf/rtld.c | 15 ---- sysdeps/generic/ldsodefs.h | 6 -- sysdeps/unix/sysv/linux/configure | 5 ++ sysdeps/unix/sysv/linux/configure.ac | 2 + sysdeps/unix/sysv/linux/dl-librecon.h | 59 -------------- sysdeps/unix/sysv/linux/dl-osinfo.h | 25 ------ sysdeps/unix/sysv/linux/dl-sysdep.c | 93 ---------------------- sysdeps/unix/sysv/linux/dl-sysdep.h | 7 -- sysdeps/unix/sysv/linux/i386/dl-librecon.h | 2 - 17 files changed, 32 insertions(+), 243 deletions(-) delete mode 100644 sysdeps/unix/sysv/linux/dl-librecon.h diff --git a/NEWS b/NEWS index 626eeabf5d..bbbcc55b0c 100644 --- a/NEWS +++ b/NEWS @@ -17,6 +17,11 @@ Deprecated and removed features, and other changes affecting compatibility: removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment variables and their functionality in the dynamic loader. +* The kernel version check has been removed along with the LD_ASSUME_KERNEL + environment variable. The minimum kernel used to built glibc is still + provided through NT_GNU_ABI_TAG ELF note and also printed when libc.so + is issued directly. + Changes to build and runtime requirements: [Add changes to build and runtime requirements here] diff --git a/config.h.in b/config.h.in index ff8597413d..dd466e102a 100644 --- a/config.h.in +++ b/config.h.in @@ -138,6 +138,9 @@ /* Linux specific: minimum supported kernel version. */ #undef __LINUX_KERNEL_VERSION +/* Linux specific: __LINUX_KERNEL_VERSION as a string. */ +#undef __LINUX_KERNEL_VERSION_STR + /* Override abi-tags ABI version if necessary. */ #undef __ABI_TAG_VERSION diff --git a/csu/libc-start.c b/csu/libc-start.c index e91f996426..6e22c1f19e 100644 --- a/csu/libc-start.c +++ b/csu/libc-start.c @@ -316,14 +316,6 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), __stack_chk_guard = stack_chk_guard; # endif -# ifdef DL_SYSDEP_OSCHECK - { - /* This needs to run to initiliaze _dl_osversion before TLS - setup might check it. */ - DL_SYSDEP_OSCHECK (__libc_fatal); - } -# endif - /* Initialize libpthread if linked in. */ if (__pthread_initialize_minimal != NULL) __pthread_initialize_minimal (); diff --git a/csu/version.c b/csu/version.c index 0de4df5b3f..8c0ed79c01 100644 --- a/csu/version.c +++ b/csu/version.c @@ -33,6 +33,9 @@ Compiled by GNU CC version "__VERSION__".\n" #ifdef LIBC_ABIS_STRING LIBC_ABIS_STRING #endif +#ifdef __LINUX_KERNEL_VERSION_STR +"Minimum supported kernel: " __LINUX_KERNEL_VERSION_STR "\n" +#endif "For bug reporting instructions, please see:\n\ "REPORT_BUGS_TO".\n"; diff --git a/elf/dl-cache.c b/elf/dl-cache.c index 88bf78ad7c..8bbf110d02 100644 --- a/elf/dl-cache.c +++ b/elf/dl-cache.c @@ -297,9 +297,6 @@ search_cache (const char *string_table, uint32_t string_table_size, if ((libnew->hwcap & hwcap_exclude) && !named_hwcap) continue; - if (GLRO (dl_osversion) - && libnew->osversion > GLRO (dl_osversion)) - continue; if (_DL_PLATFORMS_COUNT && (libnew->hwcap & _DL_HWCAP_PLATFORM) != 0 && ((libnew->hwcap & _DL_HWCAP_PLATFORM) diff --git a/elf/dl-diagnostics.c b/elf/dl-diagnostics.c index d29bdd6904..dd3871b1e0 100644 --- a/elf/dl-diagnostics.c +++ b/elf/dl-diagnostics.c @@ -231,10 +231,6 @@ print_version (void) void _dl_print_diagnostics (char **environ) { -#ifdef HAVE_DL_DISCOVER_OSVERSION - _dl_diagnostics_print_labeled_value - ("dl_discover_osversion", _dl_discover_osversion ()); -#endif _dl_diagnostics_print_labeled_string ("dl_dst_lib", DL_DST_LIB); _dl_diagnostics_print_labeled_value ("dl_hwcap", GLRO (dl_hwcap)); _dl_diagnostics_print_labeled_value ("dl_hwcap_important", HWCAP_IMPORTANT); @@ -243,7 +239,6 @@ _dl_print_diagnostics (char **environ) ("dl_hwcaps_subdirs", _dl_hwcaps_subdirs); _dl_diagnostics_print_labeled_value ("dl_hwcaps_subdirs_active", _dl_hwcaps_subdirs_active ()); - _dl_diagnostics_print_labeled_value ("dl_osversion", GLRO (dl_osversion)); _dl_diagnostics_print_labeled_value ("dl_pagesize", GLRO (dl_pagesize)); _dl_diagnostics_print_labeled_string ("dl_platform", GLRO (dl_platform)); _dl_diagnostics_print_labeled_string diff --git a/elf/dl-load.c b/elf/dl-load.c index 892e8ef2f6..ba175a0035 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1631,7 +1631,6 @@ open_verify (const char *name, int fd, ElfW(Phdr) *phdr, *ph; ElfW(Word) *abi_note; ElfW(Word) *abi_note_malloced = NULL; - unsigned int osversion; size_t maplength; /* We successfully opened the file. Now verify it is a file @@ -1695,13 +1694,16 @@ open_verify (const char *name, int fd, #endif ) errstring = N_("invalid ELF header"); + else if (ehdr->e_ident[EI_CLASS] != ELFW(CLASS)) { /* This is not a fatal error. On architectures where 32-bit and 64-bit binaries can be run this might happen. */ *found_other_class = true; - goto close_and_out; + __close_nocancel (fd); + __set_errno (ENOENT); + return -1; } else if (ehdr->e_ident[EI_DATA] != byteorder) { @@ -1736,7 +1738,11 @@ open_verify (const char *name, int fd, goto lose; } if (! __glibc_likely (elf_machine_matches_host (ehdr))) - goto close_and_out; + { + __close_nocancel (fd); + __set_errno (ENOENT); + return -1; + } else if (__glibc_unlikely (ehdr->e_type != ET_DYN && ehdr->e_type != ET_EXEC)) { @@ -1768,7 +1774,11 @@ open_verify (const char *name, int fd, if (__glibc_unlikely (elf_machine_reject_phdr_p (phdr, ehdr->e_phnum, fbp->buf, fbp->len, loader, fd))) - goto close_and_out; + { + __close_nocancel (fd); + __set_errno (ENOENT); + return -1; + } /* Check .note.ABI-tag if present. */ for (ph = phdr; ph < &phdr[ehdr->e_phnum]; ++ph) @@ -1820,18 +1830,6 @@ open_verify (const char *name, int fd, if (size == 0) continue; - osversion = (abi_note[5] & 0xff) * 65536 - + (abi_note[6] & 0xff) * 256 - + (abi_note[7] & 0xff); - if (abi_note[4] != __ABI_TAG_OS - || (GLRO(dl_osversion) && GLRO(dl_osversion) < osversion)) - { - close_and_out: - __close_nocancel (fd); - __set_errno (ENOENT); - fd = -1; - } - break; } free (abi_note_malloced); diff --git a/elf/dl-support.c b/elf/dl-support.c index 6d2c4baf81..1d648ce3a6 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -394,10 +394,6 @@ _dl_non_dynamic_init (void) DL_PLATFORM_INIT; #endif -#ifdef DL_OSVERSION_INIT - DL_OSVERSION_INIT; -#endif - /* Now determine the length of the platform string. */ if (_dl_platform != NULL) _dl_platformlen = strlen (_dl_platform); diff --git a/elf/rtld.c b/elf/rtld.c index 19e328f89e..11110cb436 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -384,9 +384,6 @@ struct rtld_global_ro _rtld_global_ro attribute_relro = ._dl_error_free = _dl_error_free, ._dl_tls_get_addr_soft = _dl_tls_get_addr_soft, ._dl_libc_freeres = __rtld_libc_freeres, -#ifdef HAVE_DL_DISCOVER_OSVERSION - ._dl_discover_osversion = _dl_discover_osversion -#endif }; /* If we would use strong_alias here the compiler would see a non-hidden definition. This would undo the effect of the previous @@ -1715,10 +1712,6 @@ dl_main (const ElfW(Phdr) *phdr, /* With vDSO setup we can initialize the function pointers. */ setup_vdso_pointers (); -#ifdef DL_SYSDEP_OSCHECK - DL_SYSDEP_OSCHECK (_dl_fatal_printf); -#endif - /* Initialize the data structures for the search paths for shared objects. */ call_init_paths (&state); @@ -2644,14 +2637,6 @@ process_envvars (struct dl_main_state *state) GLRO(dl_dynamic_weak) = 1; break; - case 13: - /* We might have some extra environment variable with length 13 - to handle. */ -#ifdef EXTRA_LD_ENVVARS_13 - EXTRA_LD_ENVVARS_13 -#endif - break; - case 14: /* Where to place the profiling data file. */ if (!__libc_enable_secure diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index 9878e7e87e..97cbe41171 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -563,8 +563,6 @@ struct rtld_global_ro /* These two are used only internally. */ #define DL_DEBUG_HELP (1 << 10) - /* OS version. */ - EXTERN unsigned int _dl_osversion; /* Platform name. */ EXTERN const char *_dl_platform; EXTERN size_t _dl_platformlen; @@ -712,10 +710,6 @@ struct rtld_global_ro dlopen. */ int (*_dl_find_object) (void *, struct dl_find_object *); -#ifdef HAVE_DL_DISCOVER_OSVERSION - int (*_dl_discover_osversion) (void); -#endif - /* Dynamic linker operations used after static dlopen. */ const struct dlfcn_hook *_dl_dlfcn_hook; diff --git a/sysdeps/unix/sysv/linux/configure b/sysdeps/unix/sysv/linux/configure index 4ff02c9b6d..312055c469 100644 --- a/sysdeps/unix/sysv/linux/configure +++ b/sysdeps/unix/sysv/linux/configure @@ -70,6 +70,7 @@ fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking for kernel header at least $minimum_kernel" >&5 $as_echo_n "checking for kernel header at least $minimum_kernel... " >&6; } decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`; +abinumstr=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1.\2.\3/'`; abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`; cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ @@ -96,6 +97,10 @@ $as_echo "$libc_minimum_kernel" >&6; } if test "$libc_minimum_kernel" = ok; then cat >>confdefs.h <<_ACEOF #define __LINUX_KERNEL_VERSION $decnum +_ACEOF + + cat >>confdefs.h <<_ACEOF +#define __LINUX_KERNEL_VERSION_STR "$abinumstr" _ACEOF cat >>confdefs.h <<_ACEOF diff --git a/sysdeps/unix/sysv/linux/configure.ac b/sysdeps/unix/sysv/linux/configure.ac index 197b7e66c8..5896d1135b 100644 --- a/sysdeps/unix/sysv/linux/configure.ac +++ b/sysdeps/unix/sysv/linux/configure.ac @@ -50,6 +50,7 @@ fi AC_MSG_CHECKING(for kernel header at least $minimum_kernel) changequote(,)dnl decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`; +abinumstr=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1.\2.\3/'`; abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`; changequote([,])dnl AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[#include @@ -59,6 +60,7 @@ AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[#include AC_MSG_RESULT($libc_minimum_kernel) if test "$libc_minimum_kernel" = ok; then AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum) + AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION_STR, "$abinumstr") AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum) else AC_MSG_ERROR([*** The available kernel headers are older than the requested diff --git a/sysdeps/unix/sysv/linux/dl-librecon.h b/sysdeps/unix/sysv/linux/dl-librecon.h deleted file mode 100644 index dfebcea4d8..0000000000 --- a/sysdeps/unix/sysv/linux/dl-librecon.h +++ /dev/null @@ -1,59 +0,0 @@ -/* Optional code to distinguish library flavours. - Copyright (C) 2001-2022 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_LIBRECON_H -#define _DL_LIBRECON_H 1 - -static inline void __attribute__ ((unused, always_inline)) -_dl_osversion_init (char *assume_kernel) -{ - unsigned long int i, j, osversion = 0; - char *p = assume_kernel, *q; - - for (i = 0; i < 3; i++, p = q + 1) - { - j = _dl_strtoul (p, &q); - if (j >= 255 || p == q || (i < 2 && *q && *q != '.')) - { - osversion = 0; - break; - } - osversion |= j << (16 - 8 * i); - if (!*q) - break; - } - if (osversion) - GLRO(dl_osversion) = osversion; -} - -/* Recognizing extra environment variables. */ -#define EXTRA_LD_ENVVARS_13 \ - if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \ - { \ - _dl_osversion_init (&envline[14]); \ - break; \ - } - -#define DL_OSVERSION_INIT \ - do { \ - char *assume_kernel = getenv ("LD_ASSUME_KERNEL"); \ - if (assume_kernel) \ - _dl_osversion_init (assume_kernel); \ - } while (0) - -#endif /* dl-librecon.h */ diff --git a/sysdeps/unix/sysv/linux/dl-osinfo.h b/sysdeps/unix/sysv/linux/dl-osinfo.h index 349d93e8ed..7888915f12 100644 --- a/sysdeps/unix/sysv/linux/dl-osinfo.h +++ b/sysdeps/unix/sysv/linux/dl-osinfo.h @@ -22,31 +22,6 @@ #include #include -#ifndef MIN -# define MIN(a,b) (((a)<(b))?(a):(b)) -#endif - -#define DL_SYSDEP_OSCHECK(FATAL) \ - do { \ - /* Test whether the kernel is new enough. This test is only performed \ - if the library is not compiled to run on all kernels. */ \ - \ - int version = _dl_discover_osversion (); \ - if (__glibc_likely (version >= 0)) \ - { \ - if (__builtin_expect (GLRO(dl_osversion) == 0, 1) \ - || GLRO(dl_osversion) > version) \ - GLRO(dl_osversion) = version; \ - \ - /* Now we can test with the required version. */ \ - if (__LINUX_KERNEL_VERSION > 0 && version < __LINUX_KERNEL_VERSION) \ - /* Not sufficent. */ \ - FATAL ("FATAL: kernel too old\n"); \ - } \ - else if (__LINUX_KERNEL_VERSION > 0) \ - FATAL ("FATAL: cannot determine kernel version\n"); \ - } while (0) - static inline uintptr_t __attribute__ ((always_inline)) _dl_setup_stack_chk_guard (void *dl_random) { diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c index 8ad72c4b7b..ae1856a4ef 100644 --- a/sysdeps/unix/sysv/linux/dl-sysdep.c +++ b/sysdeps/unix/sysv/linux/dl-sysdep.c @@ -300,96 +300,3 @@ _dl_show_auxv (void) } #endif /* SHARED */ - - -int -attribute_hidden -_dl_discover_osversion (void) -{ -#ifdef SHARED - if (GLRO(dl_sysinfo_map) != NULL) - { - /* If the kernel-supplied DSO contains a note indicating the kernel's - version, we don't need to call uname or parse any strings. */ - - static const struct - { - ElfW(Nhdr) hdr; - char vendor[8]; - } expected_note = { { sizeof "Linux", sizeof (ElfW(Word)), 0 }, "Linux" }; - const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr; - const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum; - for (uint_fast16_t i = 0; i < phnum; ++i) - if (phdr[i].p_type == PT_NOTE) - { - const ElfW(Addr) start = (phdr[i].p_vaddr - + GLRO(dl_sysinfo_map)->l_addr); - const ElfW(Nhdr) *note = (const void *) start; - while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz) - { - if (!memcmp (note, &expected_note, sizeof expected_note)) - return *(const ElfW(Word) *) ((const void *) note - + sizeof expected_note); -#define ROUND(len) (((len) + sizeof note->n_type - 1) & -sizeof note->n_type) - note = ((const void *) (note + 1) - + ROUND (note->n_namesz) + ROUND (note->n_descsz)); -#undef ROUND - } - } - } -#endif /* SHARED */ - - char bufmem[64]; - char *buf = bufmem; - unsigned int version; - int parts; - char *cp; - struct utsname uts; - - /* Try the uname system call. */ - if (__uname (&uts)) - { - /* This was not successful. Now try reading the /proc filesystem. */ - int fd = __open64_nocancel ("/proc/sys/kernel/osrelease", O_RDONLY); - if (fd < 0) - return -1; - ssize_t reslen = __read_nocancel (fd, bufmem, sizeof (bufmem)); - __close_nocancel (fd); - if (reslen <= 0) - /* This also didn't work. We give up since we cannot - make sure the library can actually work. */ - return -1; - buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; - } - else - buf = uts.release; - - /* Now convert it into a number. The string consists of at most - three parts. */ - version = 0; - parts = 0; - cp = buf; - while ((*cp >= '0') && (*cp <= '9')) - { - unsigned int here = *cp++ - '0'; - - while ((*cp >= '0') && (*cp <= '9')) - { - here *= 10; - here += *cp++ - '0'; - } - - ++parts; - version <<= 8; - version |= here; - - if (*cp++ != '.' || parts == 3) - /* Another part following? */ - break; - } - - if (parts < 3) - version <<= 8 * (3 - parts); - - return version; -} diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.h b/sysdeps/unix/sysv/linux/dl-sysdep.h index cb8bf7e6b1..b3ae5cb637 100644 --- a/sysdeps/unix/sysv/linux/dl-sysdep.h +++ b/sysdeps/unix/sysv/linux/dl-sysdep.h @@ -24,10 +24,3 @@ we aren't making direct use of it. So enable this across the board. */ #define NEED_DL_SYSINFO_DSO 1 - - -#ifndef __ASSEMBLER__ -/* Get version of the OS. */ -extern int _dl_discover_osversion (void) attribute_hidden; -# define HAVE_DL_DISCOVER_OSVERSION 1 -#endif diff --git a/sysdeps/unix/sysv/linux/i386/dl-librecon.h b/sysdeps/unix/sysv/linux/i386/dl-librecon.h index 7882679f20..78e3f0d02d 100644 --- a/sysdeps/unix/sysv/linux/i386/dl-librecon.h +++ b/sysdeps/unix/sysv/linux/i386/dl-librecon.h @@ -18,8 +18,6 @@ #ifndef _DL_LIBRECON_H -#include - #define DISTINGUISH_LIB_VERSIONS \ do \ { \ -- 2.32.0