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VU#473698 RE: Vulnerability in uClibc-ng and also uClibc
by Timur David Snoke 02 Feb '22

02 Feb '22

Greetings, We have received a report that indicates that one of your products contains a vulnerability. In the interest of coordinated disclosure (which aims to address vulnerabilities before they can be exploited by attackers), we would like to communicate this information to you. To view the details associated with this case, please visit https://kb.cert.org/vince/ and create an account on VINCE, which is our coordination platform. Within VINCE, it is possible to view the original vulnerability report. VINCE also facilitates direct communication with the reporter, pending the reporter's willingness to communicate about the case. If you need to reply to this email, please do not alter the VU# in the subject line to ensure that your message is routed properly on our end. Regards, Vulnerability Analysis Team ====================================================================== CERT Coordination Center kb.cert.org / cert(a)cert.org ====================================================================== -----Original Message----- From: Waldemar Brodkorb <wbx(a)uclibc-ng.org> Sent: Tuesday, February 1, 2022 1:21 PM To: Timur David Snoke <tdsnoke(a)cert.org> Cc: 'devel(a)uclibc-ng.org' <devel(a)uclibc-ng.org> Subject: Re: [uclibc-ng-devel] Vulnerability in uClibc-ng and also uClibc Hi Timur, Timur David Snoke wrote, > Greetings, > > > > We have a reported vulnerability in both this library and the > unmaintained one, how can we communicate this to the developers? > > > > Regards, sent an email to the list. best regards Waldemar

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Vulnerability in uClibc-ng and also uClibc
by Timur David Snoke 01 Feb '22

01 Feb '22

Greetings, We have a reported vulnerability in both this library and the unmaintained one, how can we communicate this to the developers? Regards, Vulnerability Analysis Team ====================================================================== CERT Coordination Center kb.cert.org / cert(a)cert.org<mailto:cert@cert.org> ======================================================================

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[PATCH v2 1/1] sched.h: Add SCHED_DEADLINE
by Petr Vorel 28 Jan '22

28 Jan '22

Defined in kernel v3.14, commit aab03e05e8f7 ("sched/deadline: Add SCHED_DEADLINE structures & implementation") Signed-off-by: Petr Vorel <petr.vorel(a)gmail.com> --- Changes v1->v2: * fix patch title libc/sysdeps/linux/common/bits/sched.h | 1 + 1 file changed, 1 insertion(+) diff --git a/libc/sysdeps/linux/common/bits/sched.h b/libc/sysdeps/linux/common/bits/sched.h index 9d05314f5..18a9fb98d 100644 --- a/libc/sysdeps/linux/common/bits/sched.h +++ b/libc/sysdeps/linux/common/bits/sched.h @@ -31,6 +31,7 @@ #ifdef __USE_GNU # define SCHED_BATCH 3 # define SCHED_IDLE 5 +# define SCHED_DEADLINE 6 # define SCHED_RESET_ON_FORK 0x40000000 #endif -- 2.34.1

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[PATCH 1/1] sched.h_ Add SCHED_DEADLINE
by Petr Vorel 26 Jan '22

26 Jan '22

Defined in kernel v3.14, commit aab03e05e8f7 ("sched/deadline: Add SCHED_DEADLINE structures & implementation") Signed-off-by: Petr Vorel <petr.vorel(a)gmail.com> --- libc/sysdeps/linux/common/bits/sched.h | 1 + 1 file changed, 1 insertion(+) diff --git a/libc/sysdeps/linux/common/bits/sched.h b/libc/sysdeps/linux/common/bits/sched.h index 9d05314f5..18a9fb98d 100644 --- a/libc/sysdeps/linux/common/bits/sched.h +++ b/libc/sysdeps/linux/common/bits/sched.h @@ -31,6 +31,7 @@ #ifdef __USE_GNU # define SCHED_BATCH 3 # define SCHED_IDLE 5 +# define SCHED_DEADLINE 6 # define SCHED_RESET_ON_FORK 0x40000000 #endif -- 2.34.1

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new release 1.0.40
by Waldemar Brodkorb 24 Jan '22

24 Jan '22

Hi, today I released uClibc-ng 1.0.40. It fixes an important segfault on aarch64. Thanks to Peter Seiderer for fixing it. best regards Waldemar

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Re: [PATCH v1] libc/inet/resolv: fix per thread rest_state access
by Waldemar Brodkorb 21 Jan '22

21 Jan '22

Hi Peter, sorry about coming so late up with a regression. I get following failure when compiling the defconfig stm32f429_disco_xip_defconfig in buildroot with your patch: In file included from libc/inet/_res_state.c:8: libc/inet/resolv.c: In function '__res_state': libc/inet/resolv.c:3903:15: error: '__resp' undeclared (first use in this function); did you mean '_res'? 3903 | return __resp; | ^~~~~~ | _res libc/inet/resolv.c:3903:15: note: each undeclared identifier is reported only once for each function it appears in libc/inet/resolv.c:3904:1: warning: control reaches end of non-void function [-Wreturn-type] 3904 | } | ^ make[1]: *** [Makerules:368: libc/inet/_res_state.o] Error 1 make[1]: Leaving directory '/home/wbx/buildroot/output/build/uclibc-1.0.39' make: *** [package/pkg-generic.mk:295: /home/wbx/buildroot/output/build/uclibc-1.0.39/.stamp_built] Error 2 In this case Linuxthreads are used, because the target is noMMU and FLAT binary format. Any idea? best regards Waldemar Peter Seiderer wrote, > - use the provided __res_state() method instead of direct access > to struct __res_state pointer &_res/*__resp > > - change the __UCLIBC_HAS_TLS__ protected __res_state() implementation > to the one where the comment 'When threaded, _res may be a per-thread > variable.' indicates this should be used with threads/TLS enabled > > Fixes the following segfaults with buildroot raspberrypi3_64_defconfig > (uclibc, -Os, Note: runs fine using the raspberrypi3_defconfig): > > $ /usr/sbin/ntpd -n -d > 1970-01-01T00:01:49 ntpd[249]: INIT: ntpd ntpsec-1.2.0 2021-11-03T20:39:50Z: Starting > 1970-01-01T00:01:49 ntpd[249]: INIT: Command line: /usr/sbin/ntpd -n -d > 1970-01-01T00:01:49 ntpd[249]: INIT: precision = 7.240 usec (-17) > 1970-01-01T00:01:49 ntpd[249]: INIT: successfully locked into RAM > 1970-01-01T00:01:49 ntpd[249]: CONFIG: readconfig: parsing file: /etc/ntp.conf > 1970-01-01T00:01:49 ntpd[249]: CONFIG: restrict nopeer ignored > 1970-01-01T00:01:49 ntpd[249]: INIT: Using SO_TIMESTAMPNS > 1970-01-01T00:01:49 ntpd[249]: IO: Listen and drop on 0 v6wildcard [::]:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listen and drop on 1 v4wildcard 0.0.0.0:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 2 lo 127.0.0.1:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 3 eth0 172.16.0.30:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 4 lo [::1]:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 5 eth0 [fe80::ba27:ebff:fea6:340%2]:123 > 1970-01-01T00:01:49 ntpd[249]: IO: Listening on routing socket on fd #22 for interface updates > 1970-01-01T00:01:50 ntpd[249]: SYNC: Found 10 servers, suggest minsane at least 3 > 1970-01-01T00:01:50 ntpd[249]: INIT: MRU 10922 entries, 13 hash bits, 65536 bytes > 1970-01-01T00:01:50 ntpd[249]: statistics directory /var/NTP/ does not exist or is unwriteable, error No such file or directory > 1970-01-01T00:01:51 ntpd[249]: DNS: dns_probe: 0.pool.ntp.org, cast_flags:8, flags:101 > Segmentation fault (core dumped) > > $ ./host/bin/aarch64-buildroot-linux-uclibc-gdb ./build/ntpsec-1_2_0/build/main/ntpd/ntpd core > Core was generated by `/usr/sbin/ntpd -n -d'. > Program terminated with signal SIGSEGV, Segmentation fault. > (gdb) where > #0 0x0000007f8ff1f150 in res_sync_func () at libc/inet/resolv.c:3356 > #1 0x0000007f8ff1c468 in __open_nameservers () at libc/inet/resolv.c:949 > #2 0x0000007f8ff1b498 in __dns_lookup (name=0x55943c67f0 "0.pool.ntp.org", > type=1, outpacket=0x7f8fe91c48, a=0x7f8fe91c08) at libc/inet/resolv.c:1134 > #3 0x0000007f8ff1d744 in __GI_gethostbyname_r ( > name=0x55943c67f0 "0.pool.ntp.org", result_buf=0x7f8fe92628, > buf=0x7f8fe91d90 "", buflen=992, result=0x7f8fe92670, > h_errnop=0x7f8fe92668) at libc/inet/resolv.c:1966 > #4 0x0000007f8ff1d9a0 in __GI_gethostbyname2_r ( > name=0x55943c67f0 "0.pool.ntp.org", family=2, result_buf=0x7f8fe92628, > buf=0x7f8fe91d70 "0.pool.ntp.org", buflen=1024, result=0x7f8fe92670, > h_errnop=0x7f8fe92668) at libc/inet/resolv.c:2065 > #5 0x0000007f8ff16924 in gaih_inet (name=0x55943c67f0 "0.pool.ntp.org", > service=0x7f8fe92828, req=0x7f8fe92890, pai=0x7f8fe92838) > at libc/inet/getaddrinfo.c:596 > #6 0x0000007f8ff17624 in __GI_getaddrinfo ( > name=0x55943c67f0 "0.pool.ntp.org", > service=0x5582eb8acd "\377H\213D$\bL\211\367H\213\260\270", > hints=0x7f8fe92890, pai=0x5582ee1bf8) at libc/inet/getaddrinfo.c:957 > #7 0x0000005582ea60f4 in _start () > (gdb) p _res > $1 = {options = 0, nsaddr_list = {{sin_family = 0, sin_port = 0, sin_addr = { > s_addr = 0}, sin_zero = "\000\000\000\000\000\000\000"}, { > sin_family = 0, sin_port = 0, sin_addr = {s_addr = 0}, > sin_zero = "\000\000\000\000\000\000\000"}, {sin_family = 0, > sin_port = 0, sin_addr = {s_addr = 0}, > sin_zero = "\000\000\000\000\000\000\000"}}, dnsrch = {0x0, 0x0, 0x0, > 0x0, 0x0, 0x0, 0x0}, nscount = 0 '\000', ndots = 0 '\000', > retrans = 0 '\000', retry = 0 '\000', defdname = '\000' <repeats 255 times>, > nsort = 0 '\000', pfcode = 0, id = 0, res_h_errno = 0, sort_list = {{addr = { > s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { > s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { > s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { > s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { > s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}}, _u = { > _ext = {nsaddrs = {0x0, 0x0, 0x0}, nscount = 0 '\000', nstimes = {0, 0, > 0}, nssocks = {0, 0, 0}, nscount6 = 0, nsinit = 0}}} > (gdb) p &_res > $2 = (struct __res_state *) 0x7f8ff8fd98 <_res> > (gdb) p rp > $3 = (struct __res_state *) 0x7fffffffff > > And the following uclibc code at libc/inet/resolv.c:3356: > > 3345 static void res_sync_func(void) > 3346 { > 3347 struct __res_state *rp = &(_res); > 3348 int n; > 3349 > 3350 /* If we didn't get malloc failure earlier... */ > 3351 if (__nameserver != (void*) &__local_nameserver) { > 3352 /* TODO: > 3353 * if (__nameservers < rp->nscount) - try to grow __nameserver[]? > 3354 */ > 3355 #ifdef __UCLIBC_HAS_IPV6__ > 3356 if (__nameservers > rp->_u._ext.nscount) > 3357 __nameservers = rp->_u._ext.nscount; > 3358 n = __nameservers; > > The special thing about ntpsec is the DNS lookup in an extra thread > and/or the call to res_init(), see ntpsec-1_2_0/ntpd/ntp_dns.c: > > 69 msyslog(LOG_INFO, "DNS: dns_probe: %s, cast_flags:%x, flags:%x%s", > 70 hostname, pp->cast_flags, pp->cfg.flags, busy); > 71 if (NULL != active) /* normally redundant */ > 72 return false; > 73 > 74 active = pp; > 75 > 76 sigfillset(&block_mask); > 77 pthread_sigmask(SIG_BLOCK, &block_mask, &saved_sig_mask); > 78 rc = pthread_create(&worker, NULL, dns_lookup, pp); > > and > > 165 static void* dns_lookup(void* arg) > 166 { > 167 struct peer *pp = (struct peer *) arg; > 168 struct addrinfo hints; > 169 > 170 #ifdef HAVE_SECCOMP_H > 171 setup_SIGSYS_trap(); /* enable trap for this thread */ > 172 #endif > 173 > 174 #ifdef HAVE_RES_INIT > 175 /* Reload DNS servers from /etc/resolv.conf in case DHCP has updated it. > 176 * We only need to do this occasionally, but it's not expensive > 177 * and simpler to do it every time than it is to figure out when > 178 * to do it. > 179 * This res_init() covers NTS too. > 180 */ > 181 res_init(); > 182 #endif > 183 > 184 if (pp->cfg.flags & FLAG_NTS) { > 185 #ifndef DISABLE_NTS > 186 nts_probe(pp); > 187 #endif > 188 } else { > 189 ZERO(hints); > 190 hints.ai_protocol = IPPROTO_UDP; > 191 hints.ai_socktype = SOCK_DGRAM; > 192 hints.ai_family = AF(&pp->srcadr); > 193 gai_rc = getaddrinfo(pp->hostname, NTP_PORTA, &hints, &answer); > 194 } > > $ /usr/lib/uclibc-ng-test/test/inet/tst-res > Segmentation fault (core dumped) > > $ ./host/bin/aarch64-buildroot-linux-uclibc-gdb ./build/uclibc-ng-test-0844445e7358eb10e716155b55b0fb23e88d644a/test/inet/tst-res core > Core was generated by `/usr/lib/uclibc-ng-test/test/inet/tst-res'. > Program terminated with signal SIGSEGV, Segmentation fault. > (gdb) where > #0 __GI___res_init () at libc/inet/resolv.c:3514 > #1 0x0000005591e507e4 in main (argc=<optimized out>, argv=<optimized out>) > at tst-res.c:20 > > Signed-off-by: Peter Seiderer <ps.report(a)gmx.net> > --- > include/resolv.h | 2 +- > libc/inet/resolv.c | 4 ++-- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/include/resolv.h b/include/resolv.h > index 485b8db98..2a82641a4 100644 > --- a/include/resolv.h > +++ b/include/resolv.h > @@ -457,7 +457,7 @@ __END_DECLS > # ifndef NOT_IN_libc > # define __resp __libc_resp > # endif > -# define _res (*__resp) > +# define _res (*__res_state()) > extern __thread struct __res_state *__resp attribute_tls_model_ie; > # endif > # else > diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c > index 8bbd7c7cd..cf170fba6 100644 > --- a/libc/inet/resolv.c > +++ b/libc/inet/resolv.c > @@ -3344,7 +3344,7 @@ libc_hidden_def(dn_skipname) > /* Will be called under __resolv_lock. */ > static void res_sync_func(void) > { > - struct __res_state *rp = &(_res); > + struct __res_state *rp = __res_state(); > int n; > > /* If we didn't get malloc failure earlier... */ > @@ -3896,7 +3896,7 @@ res_ninit(res_state statp) > #endif /* L_res_init */ > > #ifdef L_res_state > -# if defined __UCLIBC_HAS_TLS__ > +# if !defined __UCLIBC_HAS_TLS__ > struct __res_state * > __res_state (void) > { > -- > 2.33.1 > > _______________________________________________ > devel mailing list -- devel(a)uclibc-ng.org > To unsubscribe send an email to devel-leave(a)uclibc-ng.org >

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[PATCH 1/1] arc: fix signal handler restorer
by Sergey Matyukevich 10 Jan '22

10 Jan '22

From: Sergey Matyukevich <sergey.matyukevich(a)synopsys.com> When MD_FALLBACK_FRAME_STATE_FOR handler in libgcc unwind code checks the second instruction opcode in __default_rt_sa_restorer function, it expects to see the following values for ARC cores: - 0x7ee0781e for ARCv2 LE - 0x003f226f for ARC700 LE ARC700 value correspond to trap0 instruction. ARCv2 value corresponds to the following code: traps_0 j_s [blink] However, unlike glibc, uClibc implementation of __default_rt_sa_restorer for ARC does not have that jump. Hence libgcc unwind code is not able to recognize signal frame correctly on ARCv2 and completes too early. This change fixes libgcc unwinding over signal frame on ARCv2 adding missing jump to __default_rt_sa_restorer. Signed-off-by: Sergey Matyukevich <sergey.matyukevich(a)synopsys.com> --- libc/sysdeps/linux/arc/sigrestorer.S | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libc/sysdeps/linux/arc/sigrestorer.S b/libc/sysdeps/linux/arc/sigrestorer.S index e4deb6bd4..60d35ab3e 100644 --- a/libc/sysdeps/linux/arc/sigrestorer.S +++ b/libc/sysdeps/linux/arc/sigrestorer.S @@ -1,5 +1,5 @@ /* - * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com) + * Copyright (C) 2017-2022 Synopsys, Inc. (www.synopsys.com) * * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. */ @@ -22,4 +22,5 @@ __default_rt_sa_restorer: mov r8, __NR_rt_sigreturn ARC_TRAP_INSN + j_s [blink] -- 2.34.1

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Re: test, please ignore
by Waldemar Brodkorb 23 Dec '21

23 Dec '21

Hi Yann, the archiving of emails was broken since I setup mailman3 :( I hopefully fixed this now. best regards Waldemar Yann Sionneau wrote, > ack! Received :) > > Le 23/12/2021 à 22:43, Waldemar Brodkorb a écrit : > > _______________________________________________ > > devel mailing list -- devel(a)uclibc-ng.org > > To unsubscribe send an email to devel-leave(a)uclibc-ng.org >

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Re: [PATCH 1/3] kvx: fix warning about __BITS_PER_LONG not being defined
by Waldemar Brodkorb 23 Dec '21

23 Dec '21

Hi Yann, finally pushed all three patches, seems I missed them. best regards Waldemar Yann Sionneau wrote, > Signed-off-by: Yann Sionneau <ysionneau(a)kalray.eu> > --- > libc/sysdeps/linux/kvx/bits/kernel_types.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/libc/sysdeps/linux/kvx/bits/kernel_types.h b/libc/sysdeps/linux/kvx/bits/kernel_types.h > index 832b17674..8f6bda8e9 100644 > --- a/libc/sysdeps/linux/kvx/bits/kernel_types.h > +++ b/libc/sysdeps/linux/kvx/bits/kernel_types.h > @@ -7,6 +7,8 @@ > #ifndef __ASM_GENERIC_POSIX_TYPES_H > #define __ASM_GENERIC_POSIX_TYPES_H > > +#include <asm/bitsperlong.h> > + > typedef unsigned long __kernel_dev_t; > typedef unsigned long __kernel_ino_t; > typedef unsigned int __kernel_mode_t; > -- > 2.17.1 > > _______________________________________________ > devel mailing list -- devel(a)uclibc-ng.org > To unsubscribe send an email to devel-leave(a)uclibc-ng.org >

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[PATCH] Fix warnings due to missing attributes for __EI_ prefixed symbols
by Yann Sionneau 25 Aug '21

25 Aug '21

With new compiler (gcc >= 9 ?) building uClibc-ng now gives this sort of warnings: ./include/libc-symbols.h:426:25: warning: '__EI_localeconv' specifies less restrictive attribute than its target 'localeconv': 'nothrow' [-Wmissing-attributes] 426 | extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local)))) | ^~~~~ ./include/libc-symbols.h:429:29: note: in expansion of macro '__hidden_ver1' 429 | # define hidden_def(name) __hidden_ver1(__GI_##name, name, name); | ^~~~~~~~~~~~~ ./include/libc-symbols.h:497:32: note: in expansion of macro 'hidden_def' 497 | # define libc_hidden_def(name) hidden_def (name) | ^~~~~~~~~~ libc/misc/locale/locale.c:306:1: note: in expansion of macro 'libc_hidden_def' 306 | libc_hidden_def(localeconv) | ^~~~~~~~~~~~~~~ In file included from libc/misc/locale/localeconv.c:8: libc/misc/locale/locale.c:261:15: note: '__EI_localeconv' target declared here 261 | struct lconv *localeconv(void) | ^~~~~~~~~~ The fix is mostly being backported/adapted from glibc. --- include/libc-symbols.h | 14 ++++++++++---- include/sys/cdefs.h | 11 +++++++++++ 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 4dc05c76e..2254375ad 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -156,6 +156,11 @@ # define ASM_LINE_SEP ; #endif +#ifndef __attribute_copy__ +/* Provide an empty definition when cdefs.h is not included. */ +# define __attribute_copy__(arg) +#endif + #ifndef __ASSEMBLER__ /* GCC understands weak symbols and aliases; use its interface where possible, instead of embedded assembly language. */ @@ -163,13 +168,13 @@ /* Define ALIASNAME as a strong alias for NAME. */ # define strong_alias(name, aliasname) _strong_alias(name, aliasname) # define _strong_alias(name, aliasname) \ - extern __typeof (name) aliasname __attribute__ ((alias (#name))); + extern __typeof (name) aliasname __attribute__ ((alias (#name))) __attribute_copy__ (name); /* Same, but does not check for type match. Use sparingly. Example: strong_alias(stat,stat64) may fail, this one works: */ # define strong_alias_untyped(name, aliasname) \ _strong_alias_untyped(name, aliasname) # define _strong_alias_untyped(name, aliasname) \ - extern __typeof (aliasname) aliasname __attribute__ ((alias (#name))); + extern __typeof (aliasname) aliasname __attribute__ ((alias (#name))) __attribute_copy__ (name); # ifdef HAVE_WEAK_SYMBOLS @@ -182,7 +187,7 @@ If weak aliases are not available, this defines a strong alias. */ # define weak_alias(name, aliasname) _weak_alias (name, aliasname) # define _weak_alias(name, aliasname) \ - extern __typeof (name) aliasname __attribute__ ((weak, alias (#name))); + extern __typeof (name) aliasname __attribute__ ((weak, alias (#name))) __attribute_copy__ (name); /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */ # define weak_extern(symbol) _weak_extern (weak symbol) @@ -423,7 +428,8 @@ FIXME! - ? # define __hidden_asmname2(prefix, name) #prefix name # define __hidden_ver1(local, internal, name) \ extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \ - extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local)))) + extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local)))) \ + __attribute_copy__ (name) # define hidden_ver(local, name) __hidden_ver1(local, __GI_##name, name); # define hidden_data_ver(local, name) hidden_ver(local, name) # define hidden_def(name) __hidden_ver1(__GI_##name, name, name); diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h index a4359a05c..5c4daebcd 100644 --- a/include/sys/cdefs.h +++ b/include/sys/cdefs.h @@ -330,6 +330,17 @@ # endif #endif +/* Undefine (also defined in libc-symbols.h). */ +#undef __attribute_copy__ +#if __GNUC_PREREQ (9, 0) +/* Copies attributes from the declaration or type referenced by + the argument. */ +# define __attribute_copy__(arg) __attribute__ ((__copy__ (arg))) +#else +# define __attribute_copy__(arg) +#endif + + /* GCC 4.3 and above allow passing all anonymous arguments of an __extern_always_inline function to some other vararg function. */ #if __GNUC_PREREQ (4,3) -- 2.17.1

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