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486 lines
15 KiB
486 lines
15 KiB
commit 489d0b8b32548bc569cd3067aebf98b030720753
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Thu Jan 27 16:45:18 2022 -0300
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Linux: Only generate 64 bit timestamps for 64 bit time_t recvmsg/recvmmsg
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The timestamps created by __convert_scm_timestamps only make sense for
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64 bit time_t programs, 32 bit time_t programs will ignore 64 bit time_t
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timestamps since SO_TIMESTAMP will be defined to old values (either by
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glibc or kernel headers).
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Worse, if the buffer is not suffice MSG_CTRUNC is set to indicate it
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(which breaks some programs [1]).
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This patch makes only 64 bit time_t recvmsg and recvmmsg to call
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__convert_scm_timestamps. Also, the assumption to called it is changed
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from __ASSUME_TIME64_SYSCALLS to __TIMESIZE != 64 since the setsockopt
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might be called by libraries built without __TIME_BITS=64. The
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MSG_CTRUNC is only set for the 64 bit symbols, it should happen only
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if 64 bit time_t programs run older kernels.
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Checked on x86_64-linux-gnu and i686-linux-gnu.
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[1] https://github.com/systemd/systemd/pull/20567
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Reviewed-by: Florian Weimer <fweimer@redhat.com>
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(cherry picked from commit 948ce73b31fdb0860bcec4b8e62b14e88234f98a)
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diff --git a/include/sys/socket.h b/include/sys/socket.h
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index a1d749f9fa7b9257..6e4cf5077fb885a9 100644
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--- a/include/sys/socket.h
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+++ b/include/sys/socket.h
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@@ -98,15 +98,21 @@ extern int __sendmmsg (int __fd, struct mmsghdr *__vmessages,
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libc_hidden_proto (__sendmmsg)
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#endif
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-/* Receive a message as described by MESSAGE from socket FD.
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- Returns the number of bytes read or -1 for errors. */
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extern ssize_t __libc_recvmsg (int __fd, struct msghdr *__message,
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int __flags);
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extern ssize_t __recvmsg (int __fd, struct msghdr *__message,
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int __flags) attribute_hidden;
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#if __TIMESIZE == 64
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+# define __libc_recvmsg64 __libc_recvmsg
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+# define __recvmsg64 __recvmsg
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# define __recvmmsg64 __recvmmsg
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#else
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+extern ssize_t __libc_recvmsg64 (int __fd, struct msghdr *__message,
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+ int __flags);
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+extern ssize_t __recvmsg64 (int __fd, struct msghdr *__message,
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+ int __flags);
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+/* Receive a message as described by MESSAGE from socket FD.
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+ Returns the number of bytes read or -1 for errors. */
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extern int __recvmmsg64 (int __fd, struct mmsghdr *vmessages,
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unsigned int vlen, int flags,
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struct __timespec64 *timeout);
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diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
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index 7c75e22c6d0e9ff5..0657f4003e7116c6 100644
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--- a/sysdeps/unix/sysv/linux/Makefile
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+++ b/sysdeps/unix/sysv/linux/Makefile
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@@ -273,8 +273,14 @@ sysdep_routines += cmsg_nxthdr
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CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables
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-tests += tst-socket-timestamp
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-tests-time64 += tst-socket-timestamp-time64
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+tests += \
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+ tst-socket-timestamp \
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+ tst-socket-timestamp-compat \
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+ # tests
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+tests-time64 += \
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+ tst-socket-timestamp-time64 \
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+ tst-socket-timestamp-compat-time64
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+ # tests-time64
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tests-special += $(objpfx)tst-socket-consts.out
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$(objpfx)tst-socket-consts.out: ../sysdeps/unix/sysv/linux/tst-socket-consts.py
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diff --git a/sysdeps/unix/sysv/linux/recvmmsg.c b/sysdeps/unix/sysv/linux/recvmmsg.c
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index 5cd107ffa9be0699..fca9f6582db67fd7 100644
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--- a/sysdeps/unix/sysv/linux/recvmmsg.c
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+++ b/sysdeps/unix/sysv/linux/recvmmsg.c
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@@ -20,9 +20,9 @@
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#include <sysdep.h>
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#include <socketcall.h>
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-int
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-__recvmmsg64 (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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- struct __timespec64 *timeout)
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+static int
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+recvmmsg_syscall (int fd, struct mmsghdr *vmessages, unsigned int vlen,
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+ int flags, struct __timespec64 *timeout)
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{
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#ifndef __NR_recvmmsg_time64
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# define __NR_recvmmsg_time64 __NR_recvmmsg
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@@ -45,12 +45,6 @@ __recvmmsg64 (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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pts32 = &ts32;
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}
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- socklen_t csize[IOV_MAX];
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- if (vlen > IOV_MAX)
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- vlen = IOV_MAX;
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- for (int i = 0; i < vlen; i++)
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- csize[i] = vmessages[i].msg_hdr.msg_controllen;
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-
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# ifdef __ASSUME_RECVMMSG_SYSCALL
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r = SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, pts32);
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# else
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@@ -60,11 +54,31 @@ __recvmmsg64 (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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{
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if (timeout != NULL)
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*timeout = valid_timespec_to_timespec64 (ts32);
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+ }
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+#endif
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+ return r;
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+}
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+
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+int
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+__recvmmsg64 (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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+ struct __timespec64 *timeout)
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+{
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+#if __TIMESIZE != 64
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+ socklen_t csize[IOV_MAX];
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+ if (vlen > IOV_MAX)
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+ vlen = IOV_MAX;
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+ for (int i = 0; i < vlen; i++)
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+ csize[i] = vmessages[i].msg_hdr.msg_controllen;
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+#endif
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+ int r = recvmmsg_syscall (fd, vmessages, vlen, flags, timeout);
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+#if __TIMESIZE != 64
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+ if (r > 0)
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+ {
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for (int i=0; i < r; i++)
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__convert_scm_timestamps (&vmessages[i].msg_hdr, csize[i]);
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}
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-#endif /* __ASSUME_TIME64_SYSCALLS */
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+#endif
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return r;
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}
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#if __TIMESIZE != 64
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@@ -80,7 +94,7 @@ __recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
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ts64 = valid_timespec_to_timespec64 (*timeout);
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pts64 = &ts64;
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}
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- int r = __recvmmsg64 (fd, vmessages, vlen, flags, pts64);
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+ int r = recvmmsg_syscall (fd, vmessages, vlen, flags, pts64);
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if (r >= 0 && timeout != NULL)
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/* The remanining timeout will be always less the input TIMEOUT. */
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*timeout = valid_timespec64_to_timespec (ts64);
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diff --git a/sysdeps/unix/sysv/linux/recvmsg.c b/sysdeps/unix/sysv/linux/recvmsg.c
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index 07212f7c8641a921..c4b4704fd65d80c1 100644
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--- a/sysdeps/unix/sysv/linux/recvmsg.c
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+++ b/sysdeps/unix/sysv/linux/recvmsg.c
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@@ -20,29 +20,41 @@
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#include <sysdep-cancel.h>
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#include <socketcall.h>
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+static int
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+__recvmsg_syscall (int fd, struct msghdr *msg, int flags)
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+{
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+#ifdef __ASSUME_RECVMSG_SYSCALL
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+ return SYSCALL_CANCEL (recvmsg, fd, msg, flags);
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+#else
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+ return SOCKETCALL_CANCEL (recvmsg, fd, msg, flags);
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+#endif
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+}
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+
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ssize_t
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-__libc_recvmsg (int fd, struct msghdr *msg, int flags)
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+__libc_recvmsg64 (int fd, struct msghdr *msg, int flags)
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{
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ssize_t r;
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-#ifndef __ASSUME_TIME64_SYSCALLS
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+#if __TIMESIZE != 64
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socklen_t orig_controllen = msg != NULL ? msg->msg_controllen : 0;
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#endif
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-#ifdef __ASSUME_RECVMSG_SYSCALL
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- r = SYSCALL_CANCEL (recvmsg, fd, msg, flags);
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-#else
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- r = SOCKETCALL_CANCEL (recvmsg, fd, msg, flags);
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-#endif
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+ r = __recvmsg_syscall (fd, msg, flags);
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-#ifndef __ASSUME_TIME64_SYSCALLS
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+#if __TIMESIZE != 64
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if (r >= 0 && orig_controllen != 0)
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__convert_scm_timestamps (msg, orig_controllen);
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#endif
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return r;
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}
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-weak_alias (__libc_recvmsg, recvmsg)
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-weak_alias (__libc_recvmsg, __recvmsg)
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#if __TIMESIZE != 64
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-weak_alias (__recvmsg, __recvmsg64)
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+weak_alias (__libc_recvmsg64, __recvmsg64)
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+
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+ssize_t
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+__libc_recvmsg (int fd, struct msghdr *msg, int flags)
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+{
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+ return __recvmsg_syscall (fd, msg, flags);
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+}
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#endif
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+weak_alias (__libc_recvmsg, recvmsg)
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+weak_alias (__libc_recvmsg, __recvmsg)
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diff --git a/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat-time64.c b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat-time64.c
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new file mode 100644
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index 0000000000000000..96a0bef0bf4a908b
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat-time64.c
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@@ -0,0 +1 @@
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+#include "tst-socket-timestamp-compat.c"
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diff --git a/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c
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new file mode 100644
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index 0000000000000000..de261dae5a6385cf
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/tst-socket-timestamp-compat.c
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@@ -0,0 +1,265 @@
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+/* Check recvmsg/recvmmsg 64-bit timestamp support.
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+ Copyright (C) 2022 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <arpa/inet.h>
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+#include <string.h>
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+#include <support/check.h>
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+#include <support/xsocket.h>
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+#include <support/xunistd.h>
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+#include <stdbool.h>
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+
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+/* AF_INET socket and address used to receive data. */
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+static int srv;
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+static struct sockaddr_in srv_addr;
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+
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+static int
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+do_sendto (const struct sockaddr_in *addr, int payload)
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+{
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+ int s = xsocket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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+ xconnect (s, (const struct sockaddr *) addr, sizeof (*addr));
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+
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+ xsendto (s, &payload, sizeof (payload), 0, (const struct sockaddr *) addr,
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+ sizeof (*addr));
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+
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+ xclose (s);
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+
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+ return 0;
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+}
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+
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+static void
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+do_recvmsg_ancillary (bool use_multi_call, struct mmsghdr *mmhdr,
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+ void *msgbuf, size_t msgbuflen, int exp_payload)
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+{
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+ int payload;
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+ struct iovec iov =
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+ {
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+ .iov_base = &payload,
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+ .iov_len = sizeof (payload)
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+ };
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+ mmhdr->msg_hdr.msg_name = NULL;
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+ mmhdr->msg_hdr.msg_iov = &iov;
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+ mmhdr->msg_hdr.msg_iovlen = 1;
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+ mmhdr->msg_hdr.msg_control = msgbuf;
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+ mmhdr->msg_hdr.msg_controllen = msgbuflen;
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+
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+ int r;
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+ if (use_multi_call)
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+ {
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+ r = recvmmsg (srv, mmhdr, 1, 0, NULL);
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+ if (r >= 0)
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+ r = mmhdr->msg_len;
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+ }
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+ else
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+ r = recvmsg (srv, &mmhdr->msg_hdr, 0);
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+ TEST_COMPARE (r, sizeof (int));
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+ TEST_COMPARE (payload, exp_payload);
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+}
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+
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+/* Check if recvmsg create the additional 64 bit timestamp if only 32 bit
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+ is enabled for 64 bit recvmsg symbol. */
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+static void
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+do_test_large_buffer (bool mc)
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+{
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+ struct mmsghdr mmhdr = { 0 };
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+ /* It should be large enought for either timeval/timespec and the
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+ 64 time type as well. */
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+
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+ union
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+ {
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+ struct cmsghdr cmsghdr;
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+ char msgbuf[512];
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+ } control;
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+
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+ /* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
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+ is created. */
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+ {
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+ int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
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+ sizeof (int));
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+ TEST_VERIFY_EXIT (r != -1);
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+
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+ do_sendto (&srv_addr, 42);
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+ do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
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+
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+ bool found_timestamp = false;
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+ for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
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+ cmsg != NULL;
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+ cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
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+ {
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+ if (cmsg->cmsg_level != SOL_SOCKET)
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+ continue;
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+
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+ if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
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+ found_timestamp = true;
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+ else
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+ TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
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+ }
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+
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+ TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
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+ }
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+
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+ /* Same as before, but for timespec. */
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+ {
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+ int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
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+ sizeof (int));
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+ TEST_VERIFY_EXIT (r != -1);
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+
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+ do_sendto (&srv_addr, 42);
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+ do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
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+
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+ bool found_timestamp = false;
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+ for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
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+ cmsg != NULL;
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+ cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
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+ {
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+ if (cmsg->cmsg_level != SOL_SOCKET)
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+ continue;
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+
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+ if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
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+ found_timestamp = true;
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+ else
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+ TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
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+ }
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+
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+ TEST_COMPARE (found_timestamp, sizeof (time_t) > 4);
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+ }
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+}
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+
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+/* Check if recvmsg does not create the additional 64 bit timestamp if
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+ only 32 bit timestamp is enabled if the ancillary buffer is not large
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+ enought. Also checks if MSG_CTRUNC is set iff for 64 bit recvmsg
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+ symbol. */
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+static void
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+do_test_small_buffer (bool mc)
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+{
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+ struct mmsghdr mmhdr = { 0 };
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+
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+ /* Enable 32 bit timeval precision and check if no 64 bit timeval stamp
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+ is created. */
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+ {
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+ int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMP_OLD, &(int){1},
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+ sizeof (int));
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+ TEST_VERIFY_EXIT (r != -1);
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+
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+ union
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+ {
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+ struct cmsghdr cmsghdr;
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+ char msgbuf[CMSG_SPACE (sizeof (struct timeval))];
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+ } control;
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+
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+ do_sendto (&srv_addr, 42);
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+ do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
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+
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+ bool found_timestamp = false;
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+ for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
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+ cmsg != NULL;
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+ cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
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+ {
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+ if (cmsg->cmsg_level != SOL_SOCKET)
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+ continue;
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+
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+ if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMP_NEW)
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+ found_timestamp = true;
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+ else
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+ TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMP_NEW);
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+ }
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+
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+ if (sizeof (time_t) > 4)
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+ {
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+ TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
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+ TEST_COMPARE (found_timestamp, 0);
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+ }
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+ else
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+ {
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+ TEST_VERIFY (!(mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
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+ TEST_COMPARE (found_timestamp, 0);
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+ }
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+ }
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+
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+ /* Same as before, but for timespec. */
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+ {
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+ int r = setsockopt (srv, SOL_SOCKET, SO_TIMESTAMPNS_OLD, &(int){1},
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+ sizeof (int));
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+ TEST_VERIFY_EXIT (r != -1);
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+
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+ union
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+ {
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+ struct cmsghdr cmsghdr;
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+ char msgbuf[CMSG_SPACE (sizeof (struct timespec))];
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+ } control;
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+
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+ do_sendto (&srv_addr, 42);
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+ do_recvmsg_ancillary (mc, &mmhdr, &control, sizeof control, 42);
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+
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+ bool found_timestamp = false;
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+ for (struct cmsghdr *cmsg = CMSG_FIRSTHDR (&mmhdr.msg_hdr);
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+ cmsg != NULL;
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+ cmsg = CMSG_NXTHDR (&mmhdr.msg_hdr, cmsg))
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+ {
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+ if (cmsg->cmsg_level != SOL_SOCKET)
|
|
+ continue;
|
|
+
|
|
+ if (sizeof (time_t) > 4 && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW)
|
|
+ found_timestamp = true;
|
|
+ else
|
|
+ TEST_VERIFY (cmsg->cmsg_type != SO_TIMESTAMPNS_NEW);
|
|
+ }
|
|
+
|
|
+ if (sizeof (time_t) > 4)
|
|
+ {
|
|
+ TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC));
|
|
+ TEST_COMPARE (found_timestamp, 0);
|
|
+ }
|
|
+ else
|
|
+ {
|
|
+ TEST_VERIFY ((mmhdr.msg_hdr.msg_flags & MSG_CTRUNC) == 0);
|
|
+ TEST_COMPARE (found_timestamp, 0);
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+static int
|
|
+do_test (void)
|
|
+{
|
|
+ /* This test only make sense for ABIs that support 32 bit time_t socket
|
|
+ timestampss. */
|
|
+ if (sizeof (time_t) > 4 && __WORDSIZE == 64)
|
|
+ return 0;
|
|
+
|
|
+ srv = xsocket (AF_INET, SOCK_DGRAM, 0);
|
|
+ srv_addr = (struct sockaddr_in) {
|
|
+ .sin_family = AF_INET,
|
|
+ .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) },
|
|
+ };
|
|
+ xbind (srv, (struct sockaddr *) &srv_addr, sizeof (srv_addr));
|
|
+ {
|
|
+ socklen_t sa_len = sizeof (srv_addr);
|
|
+ xgetsockname (srv, (struct sockaddr *) &srv_addr, &sa_len);
|
|
+ TEST_VERIFY (sa_len == sizeof (srv_addr));
|
|
+ }
|
|
+
|
|
+ /* Check recvmsg; */
|
|
+ do_test_large_buffer (false);
|
|
+ do_test_small_buffer (false);
|
|
+ /* Check recvmmsg. */
|
|
+ do_test_large_buffer (true);
|
|
+ do_test_small_buffer (true);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#include <support/test-driver.c>
|