4.16-stable review patch. If anyone has any objections, please let me know.
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From: Lance Richardson lance.richardson.net@gmail.com
[ Upstream commit 988bf7243e03ef69238381594e0334a79cef74a6 ]
For the x32 ABI, struct timeval has two 64-bit fields. However the kernel currently interprets the user-space values used for the SO_RCVTIMEO and SO_SNDTIMEO socket options as having a pair of 32-bit fields.
When the seconds portion of the requested timeout is less than 2**32, the seconds portion of the effective timeout is correct but the microseconds portion is zero. When the seconds portion of the requested timeout is zero and the microseconds portion is non-zero, the kernel interprets the timeout as zero (never timeout).
Fix by using 64-bit time for SO_RCVTIMEO/SO_SNDTIMEO as required for the ABI.
The code included below demonstrates the problem.
Results before patch: $ gcc -m64 -Wall -O2 -o socktmo socktmo.c && ./socktmo recv time: 2.008181 seconds send time: 2.015985 seconds
$ gcc -m32 -Wall -O2 -o socktmo socktmo.c && ./socktmo recv time: 2.016763 seconds send time: 2.016062 seconds
$ gcc -mx32 -Wall -O2 -o socktmo socktmo.c && ./socktmo recv time: 1.007239 seconds send time: 1.023890 seconds
Results after patch: $ gcc -m64 -O2 -Wall -o socktmo socktmo.c && ./socktmo recv time: 2.010062 seconds send time: 2.015836 seconds
$ gcc -m32 -O2 -Wall -o socktmo socktmo.c && ./socktmo recv time: 2.013974 seconds send time: 2.015981 seconds
$ gcc -mx32 -O2 -Wall -o socktmo socktmo.c && ./socktmo recv time: 2.030257 seconds send time: 2.013383 seconds
#include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <sys/types.h> #include <sys/time.h>
void checkrc(char *str, int rc) { if (rc >= 0) return;
perror(str); exit(1); }
static char buf[1024]; int main(int argc, char **argv) { int rc; int socks[2]; struct timeval tv; struct timeval start, end, delta;
rc = socketpair(AF_UNIX, SOCK_STREAM, 0, socks); checkrc("socketpair", rc);
/* set timeout to 1.999999 seconds */ tv.tv_sec = 1; tv.tv_usec = 999999; rc = setsockopt(socks[0], SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv); rc = setsockopt(socks[0], SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof tv); checkrc("setsockopt", rc);
/* measure actual receive timeout */ gettimeofday(&start, NULL); rc = recv(socks[0], buf, sizeof buf, 0); gettimeofday(&end, NULL); timersub(&end, &start, &delta);
printf("recv time: %ld.%06ld seconds\n", (long)delta.tv_sec, (long)delta.tv_usec);
/* fill send buffer */ do { rc = send(socks[0], buf, sizeof buf, 0); } while (rc > 0);
/* measure actual send timeout */ gettimeofday(&start, NULL); rc = send(socks[0], buf, sizeof buf, 0); gettimeofday(&end, NULL); timersub(&end, &start, &delta);
printf("send time: %ld.%06ld seconds\n", (long)delta.tv_sec, (long)delta.tv_usec); exit(0); }
Fixes: 515c7af85ed9 ("x32: Use compat shims for {g,s}etsockopt") Reported-by: Gopal RajagopalSai gopalsr83@gmail.com Signed-off-by: Lance Richardson lance.richardson.net@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/compat.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/compat.c +++ b/net/compat.c @@ -377,7 +377,8 @@ static int compat_sock_setsockopt(struct optname == SO_ATTACH_REUSEPORT_CBPF) return do_set_attach_filter(sock, level, optname, optval, optlen); - if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) + if (!COMPAT_USE_64BIT_TIME && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) return do_set_sock_timeout(sock, level, optname, optval, optlen);
return sock_setsockopt(sock, level, optname, optval, optlen); @@ -442,7 +443,8 @@ static int do_get_sock_timeout(struct so static int compat_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { - if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) + if (!COMPAT_USE_64BIT_TIME && + (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) return do_get_sock_timeout(sock, level, optname, optval, optlen); return sock_getsockopt(sock, level, optname, optval, optlen); }