Re: [Qemu-devel] [PATCH 00/18] linux-user: Extend safe_syscall wrapper use

[Riku Voipio]

On Mon, Jun 06, 2016 at 07:58:01PM +0100, Peter Maydell wrote:
> This set of pretty dull patches extends the use of the safe_syscall
> wrapper to every syscall listed in the signal(7) manpage as being
> interruptible.
>
> Most of the patches are just straightforward "use the wrapper" changes.
> For a few things get a little more complicated because we need to use
> the direct syscall rather than the helpful libc wrapper:
>  * for the IPC syscalls we need to handle the host kernel maybe
>    doing these via individual syscalls and maybe via the single
>    'ipc' syscall
>  * poll has to be implemented via the ppoll syscall now, which means
>    converting the timeout argument
>  * in order to have all the fcntl-related syscalls go via fcntl64
>    (rather than using a wrapper for both fcntl and fcntl64 on 32-bit
>    hosts), there are patches which clean up the conversion of the
>    target_flock data structures. These in passing fix buggy conversion
>    code which was making us fail some LTP tests
> 
> The last two patches are trivial ones which neaten up the QEMU
> strace output for the cases where the returned errnos printed by
> the strace layer are QEMU-internal ones rather than real guest errnos.
> 
> This patchset sits on top of:
>  * the 'fix various signal race conditions' patchset currently on list:
>    https://lists.nongnu.org/archive/html/qemu-devel/2016-05/msg05057.html
>  * the fadvise patches (on list, reviewed)
>  * the 'provide frame information in x86-64 safe_syscall' patch v2
>    (on list, reviewed)
> 
> https://git.linaro.org/people/peter.maydell/qemu-arm.git sigrace-fixes-3
> is a git branch with those prequisites plus this patchset.

I've merged most of this now to to:

https://git.linaro.org/people/riku.voipio/qemu.git/shortlog/refs/heads/linux-user-for-upstream

With the changes of Adding Laurent's reviewed by's where given and
And adjusted changed to "abi_llong" in "Correct signedness of target_flock 
l_start and l_len fields" as suggested. Dropped:

- linux-user: Use __get_user() and __put_user() to handle...
    Due to comments
  linux-user: Use safe_syscall wrapper for fcntl
    Because it needs the above one
  linux-user: Avoid possible misalignment in host_to_target_siginfo()
    Since it break's compile

I think I'd prefer to send this set as-is (after some more testing) and
get fcntl and siginfo fixed for next batch. This set is already quite
big and I guess people are eager to test this fixes too.

Riku

> thanks
> -- PMM
> 
> Peter Maydell (18):
>   linux-user: Use safe_syscall wrapper for readv and writev syscalls
>   linux-user: Use safe_syscall wrapper for connect syscall
>   linux-user: Use safe_syscall wrapper for send* and recv* syscalls
>   linux-user: Use safe_syscall wrapper for msgsnd and msgrcv
>   linux-user: Use safe_syscall wrapper for mq_timedsend and
>     mq_timedreceive
>   linux-user: Use safe_syscall wrapper for flock
>   linux-user: Use safe_syscall wrapper for rt_sigtimedwait syscall
>   linux-user: Use safe_syscall wrapper for sleep syscalls
>   linux-user: Use safe_syscall wrapper for poll and ppoll syscalls
>   linux-user: Use safe_syscall wrapper for epoll_wait syscalls
>   linux-user: Use safe_syscall wrapper for semop
>   linux-user: Use safe_syscall wrapper for accept and accept4 syscalls
>   linux-user: Use safe_syscall wrapper for ioctl
>   linux-user: Use __get_user() and __put_user() to handle structs in
>     do_fcntl()
>   linux-user: Correct signedness of target_flock l_start and l_len
>     fields
>   linux-user: Use safe_syscall wrapper for fcntl
>   linux-user: Make target_strerror() return 'const char *'
>   linux-user: Special-case ERESTARTSYS in target_strerror()
> 
>  configure                 |  21 +-
>  linux-user/qemu.h         |   2 +-
>  linux-user/strace.c       |   4 +-
>  linux-user/syscall.c      | 547 
> ++++++++++++++++++++++++++++------------------
>  linux-user/syscall_defs.h |  34 +--
>  5 files changed, 359 insertions(+), 249 deletions(-)
> 
> -- 
> 1.9.1
>