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([2804:431:c7ca:99a3:99e2:1060:da92:ae49]) by smtp.gmail.com with ESMTPSA id f16-20020a0568301c3000b005c92a656cb5sm4069222ote.58.2022.03.18.10.12.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Mar 2022 10:12:44 -0700 (PDT) Message-ID: Date: Fri, 18 Mar 2022 14:12:41 -0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH] Remove special flags of libc.5.so and libc.4.so Content-Language: en-US To: libc-alpha@sourceware.org, tuliom@linux.ibm.com, lucmaga@gmail.com, fweimer@redhat.com References: <20220314205808.p2md7izvi6omblup@workbox> From: Adhemerval Zanella In-Reply-To: <20220314205808.p2md7izvi6omblup@workbox> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE 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: Fri, 18 Mar 2022 17:12:49 -0000 On 14/03/2022 17:58, Lucas A. M. Magalhaes via Libc-alpha wrote: > Updated Lucas's RFC to include the missing SYSDEP_KNOWN_LIBRARY_NAMES > and SYSDEP_KNOWN_INTERPRETER_NAMES cleanup for aarch64, i386, and > mips64 following discussions and feed back from Adhemerval[1][2]. > > Testwise I build a x86 32bits build-and-check on a x86_64 machine and > did a full build-many-glibcs.py on top of master (2da6e439164c) > without regression. > > [1] https://sourceware.org/pipermail/libc-alpha/2022-March/136809.html > [2] https://sourceware.org/pipermail/libc-alpha/2022-March/136808.html > > -- 8< -- > > The older libcs version are obsolete for over twenty years now. This > commit removes special flags of libc.5.so and libc.4.so.. It assume that > all libraries cached are libc.6.so compatible and wrote FLAG_ELF_LIBC6. Some comments below. > --- > elf/cache.c | 6 +-- > elf/ldconfig.c | 33 +------------ > elf/readelflib.c | 46 +++---------------- > elf/readlib.c | 25 +--------- > sysdeps/unix/sysv/linux/aarch64/ldconfig.h | 11 ----- > sysdeps/unix/sysv/linux/arc/ldconfig.h | 8 ---- > sysdeps/unix/sysv/linux/arm/ldconfig.h | 7 --- > sysdeps/unix/sysv/linux/csky/ldconfig.h | 6 --- > sysdeps/unix/sysv/linux/i386/ldconfig.h | 6 --- > sysdeps/unix/sysv/linux/ia64/ldconfig.h | 6 --- > .../unix/sysv/linux/mips/mips64/ldconfig.h | 7 --- > sysdeps/unix/sysv/linux/powerpc/ldconfig.h | 8 ---- > sysdeps/unix/sysv/linux/riscv/ldconfig.h | 17 ------- > sysdeps/unix/sysv/linux/s390/ldconfig.h | 7 --- > sysdeps/unix/sysv/linux/x86_64/ldconfig.h | 8 ---- > 15 files changed, 11 insertions(+), 190 deletions(-) > > diff --git a/elf/cache.c b/elf/cache.c > index dbf4c83a7a61..111888cafb3c 100644 > --- a/elf/cache.c > +++ b/elf/cache.c > @@ -158,6 +158,7 @@ struct cache_entry > /* List of all cache entries. */ > static struct cache_entry *entries; > > +/* libc4, ELF and libc5 are unsupported */ > static const char *flag_descr[] = > { "libc4", "ELF", "libc5", "libc6"}; > > @@ -169,14 +170,11 @@ print_entry (const char *lib, int flag, unsigned int osversion, > printf ("\t%s (", lib); > switch (flag & FLAG_TYPE_MASK) > { > - case FLAG_LIBC4: > - case FLAG_ELF: > - case FLAG_ELF_LIBC5: > case FLAG_ELF_LIBC6: > fputs (flag_descr[flag & FLAG_TYPE_MASK], stdout); > break; > default: > - fputs (_("unknown"), stdout); > + fputs (_("Unknown or unsupported flag"), stdout); I think we should keep the lowercase on the 'unknown', since it used in the middle of a setence. > break; > } > switch (flag & FLAG_REQUIRED_MASK) > diff --git a/elf/ldconfig.c b/elf/ldconfig.c > index 57bb95ebc334..5fe133937574 100644 > --- a/elf/ldconfig.c > +++ b/elf/ldconfig.c > @@ -65,19 +65,6 @@ > > #define PACKAGE _libc_intl_domainname > > -static const struct > -{ > - const char *name; > - int flag; > -} lib_types[] = > -{ > - {"libc4", FLAG_LIBC4}, > - {"libc5", FLAG_ELF_LIBC5}, > - {"libc6", FLAG_ELF_LIBC6}, > - {"glibc2", FLAG_ELF_LIBC6} > -}; > - > - > /* List of directories to handle. */ > struct dir_entry > { Ok. > @@ -471,25 +458,7 @@ add_dir_1 (const char *line, const char *from_file, int from_line) > > /* Search for an '=' sign. */ > entry->path = xstrdup (line); > - char *equal_sign = strchr (entry->path, '='); > - if (equal_sign) > - { > - *equal_sign = '\0'; > - ++equal_sign; > - entry->flag = FLAG_ANY; > - for (i = 0; i < sizeof (lib_types) / sizeof (lib_types[0]); ++i) > - if (strcmp (equal_sign, lib_types[i].name) == 0) > - { > - entry->flag = lib_types[i].flag; > - break; > - } > - if (entry->flag == FLAG_ANY) > - error (0, 0, _("%s is not a known library type"), equal_sign); > - } > - else > - { > - entry->flag = FLAG_ANY; > - } > + entry->flag = FLAG_ELF_LIBC6; > > /* Canonify path: for now only remove leading and trailing > whitespace and the trailing slashes. */ Ok. There are still FLAG_LIBC4 and FLAG_LIBC5 usage on ldconfig.c where I think it would be better to refactor as well: 1037 /* Some sanity checks to print warnings. */ 1038 if (opt_verbose) 1039 { 1040 if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5 1041 && entry->flag != FLAG_ANY) 1042 error (0, 0, _("libc5 library %s in wrong directory"), file_name); 1043 if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6 1044 && entry->flag != FLAG_ANY) 1045 error (0, 0, _("libc6 library %s in wrong directory"), file_name); 1046 if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4 1047 && entry->flag != FLAG_ANY) 1048 error (0, 0, _("libc4 library %s in wrong directory"), file_name); 1049 } and 1066 if (dlib_ptr->flag != flag) 1067 { 1068 if (dlib_ptr->flag == FLAG_ELF 1069 && (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6)) 1070 dlib_ptr->flag = flag; 1071 else if ((dlib_ptr->flag == FLAG_ELF_LIBC5 1072 || dlib_ptr->flag == FLAG_ELF_LIBC6) 1073 && flag == FLAG_ELF) 1074 dlib_ptr->flag = flag; 1075 else 1076 error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."), 1077 dlib_ptr->name, direntry->d_name, 1078 entry->path); 1079 } I think it would be better to just remove both and print and error. > diff --git a/elf/readelflib.c b/elf/readelflib.c > index e147416363c2..51e90fb56ad9 100644 > --- a/elf/readelflib.c > +++ b/elf/readelflib.c > @@ -44,7 +44,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag, > char **soname, void *file_contents, size_t file_length) > { > int i; > - unsigned int j; > unsigned int dynamic_addr; > size_t dynamic_size; > char *program_interpreter; > @@ -82,9 +81,8 @@ process_elf_file (const char *file_name, const char *lib, int *flag, > elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents); > check_ptr (elf_pheader); > > - /* The library is an elf library, now search for soname and > - libc5/libc6. */ > - *flag = FLAG_ELF; > + /* The library is an elf library */ > + *flag = FLAG_ELF_LIBC6; > > /* The default ISA level is 0. */ > *isa_level = 0; > @@ -111,16 +109,6 @@ process_elf_file (const char *file_name, const char *lib, int *flag, > program_interpreter = (char *) (file_contents + segment->p_offset); > check_ptr (program_interpreter); > > - /* Check if this is enough to classify the binary. */ > - for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]); > - ++j) > - if (strcmp (program_interpreter, interpreters[j].soname) == 0) > - { > - *flag = interpreters[j].flag; > - break; > - } > - break; > - > case PT_NOTE: > if (!*osversion && segment->p_filesz >= 32 && segment->p_align >= 4) > { Ok. > @@ -291,38 +279,16 @@ done: > if (dynamic_strings == NULL) > return 1; > > - /* Now read the DT_NEEDED and DT_SONAME entries. */ > + /* Now read the DT_SONAME entries. */ > for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL; > ++dyn_entry) > { > - if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME) > + if (dyn_entry->d_tag == DT_SONAME) > { > char *name = dynamic_strings + dyn_entry->d_un.d_val; > check_ptr (name); > - > - if (dyn_entry->d_tag == DT_NEEDED) > - { > - > - if (*flag == FLAG_ELF) > - { > - /* Check if this is enough to classify the binary. */ > - for (j = 0; > - j < sizeof (known_libs) / sizeof (known_libs [0]); > - ++j) > - if (strcmp (name, known_libs [j].soname) == 0) > - { > - *flag = known_libs [j].flag; > - break; > - } > - } > - } > - > - else if (dyn_entry->d_tag == DT_SONAME) > - *soname = xstrdup (name); > - > - /* Do we have everything we need? */ > - if (*soname && *flag != FLAG_ELF) > - return 0; > + *soname = xstrdup (name); > + return 0; > } > } > Ok. > diff --git a/elf/readlib.c b/elf/readlib.c > index 3651dcdd8e3d..1807aa16f20f 100644 > --- a/elf/readlib.c > +++ b/elf/readlib.c > @@ -43,24 +43,6 @@ struct known_names > int flag; > }; > > -static struct known_names interpreters[] = > -{ > - { "/lib/" LD_SO, FLAG_ELF_LIBC6 }, > -#ifdef SYSDEP_KNOWN_INTERPRETER_NAMES > - SYSDEP_KNOWN_INTERPRETER_NAMES > -#endif > -}; > - > -static struct known_names known_libs[] = > -{ > - { LIBC_SO, FLAG_ELF_LIBC6 }, > - { LIBM_SO, FLAG_ELF_LIBC6 }, > -#ifdef SYSDEP_KNOWN_LIBRARY_NAMES > - SYSDEP_KNOWN_LIBRARY_NAMES > -#endif > -}; > - > - > /* Check if string corresponds to a GDB Python file. */ > static bool > is_gdb_python_file (const char *name) > @@ -84,7 +66,8 @@ process_file (const char *real_file_name, const char *file_name, > struct exec *aout_header; > > ret = 0; > - *flag = FLAG_ANY; > + /* Just set FLAG_ELF_LIBC6 as old formats are not supported anymore. */ > + *flag = FLAG_ELF_LIBC6; > *soname = NULL; > > file = fopen (real_file_name, "rb"); > @@ -151,7 +134,6 @@ process_file (const char *real_file_name, const char *file_name, > *dot = '\0'; > } > *soname = copy; > - *flag = FLAG_LIBC4; > goto done; > } > > @@ -192,9 +174,6 @@ implicit_soname (const char *lib, int flag) > { > char *soname = xstrdup (lib); > > - if ((flag & FLAG_TYPE_MASK) != FLAG_LIBC4) > - return soname; > - > /* Aout files don't have a soname, just return the name > including the major number. */ > char *major = strstr (soname, ".so."); Ok. > diff --git a/sysdeps/unix/sysv/linux/aarch64/ldconfig.h b/sysdeps/unix/sysv/linux/aarch64/ldconfig.h > index 5cbfb327141d..69871151ed8c 100644 > --- a/sysdeps/unix/sysv/linux/aarch64/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/aarch64/ldconfig.h > @@ -17,14 +17,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux-aarch64.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-aarch64_be.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-aarch64_ilp32.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-aarch64_be_ilp32.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux.so.3", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-armhf.so.3", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/arc/ldconfig.h b/sysdeps/unix/sysv/linux/arc/ldconfig.h > index f673170e59a2..ed019a8cdb61 100644 > --- a/sysdeps/unix/sysv/linux/arc/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/arc/ldconfig.h > @@ -17,11 +17,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux-arc.so.2", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-arceb.so.2", FLAG_ELF_LIBC6 }, > - > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/arm/ldconfig.h b/sysdeps/unix/sysv/linux/arm/ldconfig.h > index d1253993eaa1..9afda09cca63 100644 > --- a/sysdeps/unix/sysv/linux/arm/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/arm/ldconfig.h > @@ -16,10 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux.so.3", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld-linux-armhf.so.3", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/csky/ldconfig.h b/sysdeps/unix/sysv/linux/csky/ldconfig.h > index fbe17e3dc81f..d4bea7b9e465 100644 > --- a/sysdeps/unix/sysv/linux/csky/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/csky/ldconfig.h > @@ -26,9 +26,3 @@ > #else > # define LD_SO_ABI "cskyv2" > #endif > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { LD_SO_PREFIX LD_SO_ABI LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/i386/ldconfig.h b/sysdeps/unix/sysv/linux/i386/ldconfig.h > index bafbec1231c7..9afda09cca63 100644 > --- a/sysdeps/unix/sysv/linux/i386/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/i386/ldconfig.h > @@ -16,9 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux.so.1", FLAG_ELF_LIBC5 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.5", FLAG_ELF_LIBC5 }, \ > - { "libm.so.5", FLAG_ELF_LIBC5 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/ia64/ldconfig.h b/sysdeps/unix/sysv/linux/ia64/ldconfig.h > index 4731419bf87b..9afda09cca63 100644 > --- a/sysdeps/unix/sysv/linux/ia64/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/ia64/ldconfig.h > @@ -16,9 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux.so.2", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h b/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h > index ac82941affb2..3f2c7cadbbb2 100644 > --- a/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/mips/mips64/ldconfig.h > @@ -16,10 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib32/ld.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib64/ld.so.1", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/powerpc/ldconfig.h b/sysdeps/unix/sysv/linux/powerpc/ldconfig.h > index 1d70657838c2..0791e3020a57 100644 > --- a/sysdeps/unix/sysv/linux/powerpc/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/powerpc/ldconfig.h > @@ -17,11 +17,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib64/ld64.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib64/ld64.so.2", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/riscv/ldconfig.h b/sysdeps/unix/sysv/linux/riscv/ldconfig.h > index e3847f116e00..5308926d8837 100644 > --- a/sysdeps/unix/sysv/linux/riscv/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/riscv/ldconfig.h > @@ -17,20 +17,3 @@ > . */ > > #include > - > -#define LD_SO_PREFIX "/lib/ld-linux-" > -#define LD_SO_SUFFIX ".so.1" > - > -#if __riscv_xlen == 64 > -# define LD_SO_ABI "riscv64-lp64" > -#else > -# define LD_SO_ABI "riscv32-ilp32" > -#endif > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { LD_SO_PREFIX LD_SO_ABI "d" LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, \ > - { LD_SO_PREFIX LD_SO_ABI LD_SO_SUFFIX, FLAG_ELF_LIBC6 }, > - > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/s390/ldconfig.h b/sysdeps/unix/sysv/linux/s390/ldconfig.h > index f564a6eaf673..9afda09cca63 100644 > --- a/sysdeps/unix/sysv/linux/s390/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/s390/ldconfig.h > @@ -16,10 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld.so.1", FLAG_ELF_LIBC6 }, \ > - { "/lib/ld64.so.1", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok. > diff --git a/sysdeps/unix/sysv/linux/x86_64/ldconfig.h b/sysdeps/unix/sysv/linux/x86_64/ldconfig.h > index b67203e0175c..9afda09cca63 100644 > --- a/sysdeps/unix/sysv/linux/x86_64/ldconfig.h > +++ b/sysdeps/unix/sysv/linux/x86_64/ldconfig.h > @@ -16,11 +16,3 @@ > . */ > > #include > - > -#define SYSDEP_KNOWN_INTERPRETER_NAMES \ > - { "/lib/ld-linux.so.2", FLAG_ELF_LIBC6 }, \ > - { "/libx32/ld-linux-x32.so.2", FLAG_ELF_LIBC6 }, \ > - { "/lib64/ld-linux-x86-64.so.2", FLAG_ELF_LIBC6 }, > -#define SYSDEP_KNOWN_LIBRARY_NAMES \ > - { "libc.so.6", FLAG_ELF_LIBC6 }, \ > - { "libm.so.6", FLAG_ELF_LIBC6 }, Ok.