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From: Adhemerval Zanella <azanella@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/azanella/y2038] linux: Add fallback for 64-bit time_t SO_{RCV, SND}TIMEO
Date: Tue, 2 Mar 2021 12:30:24 +0000 (GMT) [thread overview]
Message-ID: <20210302123024.485CC388C01D@sourceware.org> (raw)
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7a9d006fb51b7889580a07a7fc874a3354c3b9df
commit 7a9d006fb51b7889580a07a7fc874a3354c3b9df
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon Sep 7 14:13:58 2020 -0300
linux: Add fallback for 64-bit time_t SO_{RCV,SND}TIMEO
The constant value will be changed for __TIMESIZE=64, so binaries built
with 64-bit time support might fail to work properly on old kernels.
Both {get,set}sockopt will retry the syscall with the old constant
values and the timeout value adjusted when kernel returns ENOTPROTOPT.
It also changes to SO_{RCV,SND}TIMEO to follow the uapi kernel values
where SO_{RCV,SND}TIMEO_OLD indicates pre 64-bit time support and
SO_{RCV,SND}TIMEO_NEW indicate time64 support. It allows to refer to
constant independently of the time_t abi used (since kernel defines
SO_{RCV,SND}TIMEO depending of the time_t size).
The hppa, mips, powerpc, and sparc provides its own socket-constant.h,
which are also updated the the SO_{RCV,SND}TIMEO constants (they are
missed on 019d828669df966 patch).
Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
kernel).
Diff:
---
sysdeps/unix/sysv/linux/bits/socket-constants.h | 5 ++
sysdeps/unix/sysv/linux/getsockopt.c | 72 ++++++++++++++++++--
.../unix/sysv/linux/hppa/bits/socket-constants.h | 5 ++
.../unix/sysv/linux/mips/bits/socket-constants.h | 5 ++
.../sysv/linux/powerpc/bits/socket-constants.h | 5 ++
sysdeps/unix/sysv/linux/setsockopt.c | 76 +++++++++++++++++++---
.../unix/sysv/linux/sparc/bits/socket-constants.h | 5 ++
7 files changed, 158 insertions(+), 15 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/bits/socket-constants.h b/sysdeps/unix/sysv/linux/bits/socket-constants.h
index 84f7a333a2..d4e9979605 100644
--- a/sysdeps/unix/sysv/linux/bits/socket-constants.h
+++ b/sysdeps/unix/sysv/linux/bits/socket-constants.h
@@ -48,3 +48,8 @@
# define SO_SNDTIMEO 21
#endif
#define SO_TYPE 3
+
+#define SO_RCVTIMEO_OLD 20
+#define SO_SNDTIMEO_OLD 21
+#define SO_RCVTIMEO_NEW 66
+#define SO_SNDTIMEO_NEW 67
diff --git a/sysdeps/unix/sysv/linux/getsockopt.c b/sysdeps/unix/sysv/linux/getsockopt.c
index 76ee8a94d6..a093e42f96 100644
--- a/sysdeps/unix/sysv/linux/getsockopt.c
+++ b/sysdeps/unix/sysv/linux/getsockopt.c
@@ -15,16 +15,20 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include <signal.h>
#include <sys/socket.h>
-
+/* The kernel header with SO_* constants is used as default for _GNU_SOURCE,
+ however the new constants that describe 64-bit time support were added
+ only on v5.1. */
+#if !defined(SO_RCVTIMEO_NEW) || !defined(SO_RCVTIMEO_OLD)
+# include <bits/socket-constants.h>
+#endif
+#include <time.h>
+#include <sysdep.h>
#include <socketcall.h>
-#include <kernel-features.h>
-#include <sys/syscall.h>
-int
-__getsockopt (int fd, int level, int optname, void *optval, socklen_t *len)
+static int
+getsockopt_syscall (int fd, int level, int optname, void *optval,
+ socklen_t *len)
{
#ifdef __ASSUME_GETSOCKOPT_SYSCALL
return INLINE_SYSCALL (getsockopt, 5, fd, level, optname, optval, len);
@@ -32,4 +36,58 @@ __getsockopt (int fd, int level, int optname, void *optval, socklen_t *len)
return SOCKETCALL (getsockopt, fd, level, optname, optval, len);
#endif
}
+
+#ifndef __ASSUME_TIME64_SYSCALLS
+static int
+getsockopt32 (int fd, int level, int optname, void *optval,
+ socklen_t *len)
+{
+ int r = -1;
+
+ if (level != SOL_SOCKET)
+ return r;
+
+ switch (optname)
+ {
+ case SO_RCVTIMEO_NEW:
+ case SO_SNDTIMEO_NEW:
+ {
+ if (*len < sizeof (struct __timeval64))
+ {
+ __set_errno (EINVAL);
+ break;
+ }
+
+ if (optname == SO_RCVTIMEO_NEW)
+ optname = SO_RCVTIMEO_OLD;
+ if (optname == SO_SNDTIMEO_NEW)
+ optname = SO_SNDTIMEO_OLD;
+
+ struct __timeval32 tv32;
+ r = getsockopt_syscall (fd, level, optname, &tv32,
+ (socklen_t[]) { sizeof tv32 });
+ if (r < 0)
+ break;
+ struct __timeval64 *tv64 = (struct __timeval64 *) optval;
+ *tv64 = valid_timeval32_to_timeval64 (tv32);
+ *len = sizeof (*tv64);
+ }
+ }
+
+ return r;
+}
+#endif
+
+int
+__getsockopt (int fd, int level, int optname, void *optval, socklen_t *len)
+{
+ int r = getsockopt_syscall (fd, level, optname, optval, len);
+
+#ifndef __ASSUME_TIME64_SYSCALLS
+ if (r == -1 && errno == ENOPROTOOPT)
+ r = getsockopt32 (fd, level, optname, optval, len);
+#endif
+
+ return r;
+}
weak_alias (__getsockopt, getsockopt)
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/socket-constants.h b/sysdeps/unix/sysv/linux/hppa/bits/socket-constants.h
index b4fb65b9f1..2413529e71 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/socket-constants.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/socket-constants.h
@@ -36,3 +36,8 @@
#define SO_SNDLOWAT 4099
#define SO_SNDTIMEO 4101
#define SO_TYPE 4104
+
+#define SO_RCVTIMEO_OLD 4102
+#define SO_SNDTIMEO_OLD 4101
+#define SO_RCVTIMEO_NEW 16448
+#define SO_SNDTIMEO_NEW 16449
diff --git a/sysdeps/unix/sysv/linux/mips/bits/socket-constants.h b/sysdeps/unix/sysv/linux/mips/bits/socket-constants.h
index a5264536e9..2c124234fc 100644
--- a/sysdeps/unix/sysv/linux/mips/bits/socket-constants.h
+++ b/sysdeps/unix/sysv/linux/mips/bits/socket-constants.h
@@ -36,3 +36,8 @@
#define SO_SNDLOWAT 4099
#define SO_SNDTIMEO 4101
#define SO_TYPE 4104
+
+#define SO_RCVTIMEO_OLD 4102
+#define SO_SNDTIMEO_OLD 4101
+#define SO_RCVTIMEO_NEW 66
+#define SO_SNDTIMEO_NEW 67
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/socket-constants.h b/sysdeps/unix/sysv/linux/powerpc/bits/socket-constants.h
index f35488b375..682a3f4608 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/socket-constants.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/socket-constants.h
@@ -36,3 +36,8 @@
#define SO_SNDLOWAT 17
#define SO_SNDTIMEO 19
#define SO_TYPE 3
+
+#define SO_RCVTIMEO_OLD 18
+#define SO_SNDTIMEO_OLD 19
+#define SO_RCVTIMEO_NEW 66
+#define SO_SNDTIMEO_NEW 67
diff --git a/sysdeps/unix/sysv/linux/setsockopt.c b/sysdeps/unix/sysv/linux/setsockopt.c
index 12fd7bdcde..a1f98a937d 100644
--- a/sysdeps/unix/sysv/linux/setsockopt.c
+++ b/sysdeps/unix/sysv/linux/setsockopt.c
@@ -15,21 +15,81 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include <signal.h>
#include <sys/socket.h>
-
+/* The kernel header with SO_* constants is used as default for _GNU_SOURCE,
+ however the new constants that describe 64-bit time support were added
+ only on v5.1. */
+#if !defined(SO_RCVTIMEO_NEW) || !defined(SO_RCVTIMEO_OLD)
+# include <bits/socket-constants.h>
+#endif
+#include <time.h>
+#include <sysdep.h>
#include <socketcall.h>
-#include <kernel-features.h>
-#include <sys/syscall.h>
-int
-setsockopt (int fd, int level, int optname, const void *optval, socklen_t len)
+static int
+setsockopt_syscall (int fd, int level, int optname, const void *optval,
+ socklen_t len)
{
#ifdef __ASSUME_SETSOCKOPT_SYSCALL
- return INLINE_SYSCALL (setsockopt, 5, fd, level, optname, optval, len);
+ return INLINE_SYSCALL_CALL (setsockopt, fd, level, optname, optval, len);
#else
return SOCKETCALL (setsockopt, fd, level, optname, optval, len);
#endif
}
+
+#ifndef __ASSUME_TIME64_SYSCALLS
+static int
+setsockopt32 (int fd, int level, int optname, const void *optval,
+ socklen_t len)
+{
+ int r = -1;
+
+ if (level != SOL_SOCKET)
+ return r;
+
+ switch (optname)
+ {
+ case SO_RCVTIMEO_NEW:
+ case SO_SNDTIMEO_NEW:
+ {
+ if (len < sizeof (struct __timeval64))
+ {
+ __set_errno (EINVAL);
+ break;
+ }
+
+ struct __timeval64 *tv64 = (struct __timeval64 *) optval;
+ if (! in_time_t_range (tv64->tv_sec))
+ {
+ __set_errno (EOVERFLOW);
+ break;
+ }
+
+ if (optname == SO_RCVTIMEO_NEW)
+ optname = SO_RCVTIMEO_OLD;
+ if (optname == SO_SNDTIMEO_NEW)
+ optname = SO_SNDTIMEO_OLD;
+
+ struct __timeval32 tv32 = valid_timeval64_to_timeval32 (*tv64);
+
+ r = setsockopt_syscall (fd, level, optname, &tv32, sizeof (tv32));
+ }
+ }
+
+ return r;
+}
+#endif
+
+int
+setsockopt (int fd, int level, int optname, const void *optval, socklen_t len)
+{
+ int r = setsockopt_syscall (fd, level, optname, optval, len);
+
+#ifndef __ASSUME_TIME64_SYSCALLS
+ if (r == -1 && errno == ENOPROTOOPT)
+ r = setsockopt32 (fd, level, optname, optval, len);
+#endif
+
+ return r;
+}
weak_alias (setsockopt, __setsockopt)
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/socket-constants.h b/sysdeps/unix/sysv/linux/sparc/bits/socket-constants.h
index a58d0b5f96..3eae2176dd 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/socket-constants.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/socket-constants.h
@@ -36,3 +36,8 @@
#define SO_SNDLOWAT 4096
#define SO_SNDTIMEO 16384
#define SO_TYPE 4104
+
+#define SO_RCVTIMEO_OLD 8192
+#define SO_SNDTIMEO_OLD 16384
+#define SO_RCVTIMEO_NEW 68
+#define SO_SNDTIMEO_NEW 69
next reply other threads:[~2021-03-02 12:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 12:30 Adhemerval Zanella [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-06-08 20:48 Adhemerval Zanella
2021-05-26 16:24 Adhemerval Zanella
2021-03-05 19:20 Adhemerval Zanella
2021-03-04 17:36 Adhemerval Zanella
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