Re: [PATCH] treewide: Allow additional system calls for i386/i686

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Aug 20, 2024 at 01:14:07AM +0200, Stefano Brivio wrote:
> I haven't tested i386 for a long time (after playing with some
> openSUSE i586 image a couple of years ago). It turns out that a number
> of system calls we actually need were denied by the seccomp filter,
> and not even basic functionality works.
> 
> Add some system calls that glibc started using with the 64-bit time
> ("t64") transition, see also:
> 
>   https://wiki.debian.org/ReleaseGoals/64bit-time
> 
> that is: clock_gettime64, timerfd_gettime64, fcntl64, and
> recvmmsg_time64.
> 
> Add further system calls that are needed regardless of time_t width,
> that is, mmap2 (valgrind profile only), _llseek and sigreturn (common
> outside x86_64), and socketcall (same as s390x).
> 
> I validated this against an almost full run of the test suite, with
> just a few selected tests skipped. Fixes needed to run most tests on
> i386/i686, and other assorted fixes for tests, are included in
> upcoming patches.
> 
> Reported-by: Uroš Knupleš <uros@knuples.net>
> Analysed-by: Faidon Liambotis <paravoid@debian.org>
> Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1078981
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  Makefile     | 2 +-
>  log.c        | 2 +-
>  passt.c      | 6 +++---
>  pasta.c      | 2 +-
>  tcp.c        | 2 +-
>  tcp_splice.c | 2 +-
>  udp.c        | 2 +-
>  udp_flow.c   | 2 +-
>  8 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index b6329e3..01fada4 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -129,7 +129,7 @@ qrap: $(QRAP_SRCS) passt.h
>  
>  valgrind: EXTRA_SYSCALLS += rt_sigprocmask rt_sigtimedwait rt_sigaction	\
>  			    rt_sigreturn getpid gettid kill clock_gettime mmap \
> -			    munmap open unlink gettimeofday futex
> +			    mmap2 munmap open unlink gettimeofday futex
>  valgrind: FLAGS += -g -DVALGRIND
>  valgrind: all
>  
> diff --git a/log.c b/log.c
> index e7202d0..433b552 100644
> --- a/log.c
> +++ b/log.c
> @@ -98,7 +98,7 @@ const char *logfile_prefix[] = {
>   * @fd:		Log file descriptor
>   * @now:	Current timestamp
>   *
> - * #syscalls lseek ppc64le:_llseek ppc64:_llseek arm:_llseek
> + * #syscalls lseek ppc64le:_llseek ppc64:_llseek arm:_llseek i686:_llseek
>   */
>  static void logfile_rotate_fallocate(int fd, const struct timespec *now)
>  {
> diff --git a/passt.c b/passt.c
> index 4b3c306..f9670b3 100644
> --- a/passt.c
> +++ b/passt.c
> @@ -191,11 +191,11 @@ void exit_handler(int signal)
>   * Return: non-zero on failure
>   *
>   * #syscalls read write writev
> - * #syscalls socket bind connect getsockopt setsockopt s390x:socketcall close
> - * #syscalls recvfrom sendto shutdown
> + * #syscalls socket getsockopt setsockopt s390x:socketcall i686:socketcall close
> + * #syscalls bind connect recvfrom sendto shutdown
>   * #syscalls arm:recv ppc64le:recv arm:send ppc64le:send
>   * #syscalls accept4|accept listen epoll_ctl epoll_wait|epoll_pwait epoll_pwait
> - * #syscalls clock_gettime arm:clock_gettime64
> + * #syscalls clock_gettime arm:clock_gettime64 i686:clock_gettime64
>   */
>  int main(int argc, char **argv)
>  {
> diff --git a/pasta.c b/pasta.c
> index 1142f03..49b56db 100644
> --- a/pasta.c
> +++ b/pasta.c
> @@ -13,7 +13,7 @@
>   *
>   * #syscalls:pasta clone waitid exit exit_group rt_sigprocmask
>   * #syscalls:pasta rt_sigreturn|sigreturn
> - * #syscalls:pasta arm:sigreturn ppc64:sigreturn s390x:sigreturn
> + * #syscalls:pasta arm:sigreturn ppc64:sigreturn s390x:sigreturn i686:sigreturn
>   */
>  
>  #include <sched.h>
> diff --git a/tcp.c b/tcp.c
> index c0820ce..c542a78 100644
> --- a/tcp.c
> +++ b/tcp.c
> @@ -2143,7 +2143,7 @@ cancel:
>   * @c:		Execution context
>   * @ref:	epoll reference of timer (not connection)
>   *
> - * #syscalls timerfd_gettime
> + * #syscalls timerfd_gettime i686:timerfd_gettime64
>   */
>  void tcp_timer_handler(struct ctx *c, union epoll_ref ref)
>  {
> diff --git a/tcp_splice.c b/tcp_splice.c
> index 483e45d..9f5cc27 100644
> --- a/tcp_splice.c
> +++ b/tcp_splice.c
> @@ -28,7 +28,7 @@
>   * - FIN_SENT_0:		FIN (write shutdown) sent to accepted socket
>   * - FIN_SENT_1:		FIN (write shutdown) sent to target socket
>   *
> - * #syscalls:pasta pipe2|pipe fcntl arm:fcntl64 ppc64:fcntl64
> + * #syscalls:pasta pipe2|pipe fcntl arm:fcntl64 ppc64:fcntl64 i686:fcntl64
>   */
>  
>  #include <sched.h>
> diff --git a/udp.c b/udp.c
> index 7731257..851881e 100644
> --- a/udp.c
> +++ b/udp.c
> @@ -460,7 +460,7 @@ static bool udp_sock_recverr(int s)
>   * @events:	epoll events bitmap
>   * @mmh		mmsghdr array to receive into
>   *
> - * #syscalls recvmmsg
> + * #syscalls recvmmsg i686:recvmmsg_time64
>   */
>  static int udp_sock_recv(const struct ctx *c, int s, uint32_t events,
>  			 struct mmsghdr *mmh)
> diff --git a/udp_flow.c b/udp_flow.c
> index 8b25ad1..b1133c0 100644
> --- a/udp_flow.c
> +++ b/udp_flow.c
> @@ -174,7 +174,7 @@ cancel:
>   * @s_in:	Source socket address, filled in by recvmmsg()
>   * @now:	Timestamp
>   *
> - * #syscalls fcntl
> + * #syscalls fcntl arm:fcntl64 ppc64:fcntl64 i686:fcntl64
>   *
>   * Return: sidx for the destination side of the flow for this packet, or
>   *         FLOW_SIDX_NONE if we couldn't find or create a flow.

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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