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Re: [Qemu-devel] [PATCH] 9pfs: don't use AT_EMPTY_PATH in local_set_cred
From: |
Mark Cave-Ayland |
Subject: |
Re: [Qemu-devel] [PATCH] 9pfs: don't use AT_EMPTY_PATH in local_set_cred_passthrough() |
Date: |
Sat, 4 Mar 2017 13:52:07 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0 |
On 04/03/17 10:54, Greg Kurz wrote:
> The name argument can never be an empty string, and dirfd always point to
> the containing directory of the file name. AT_EMPTY_PATH is hence useless
> here. Also it breaks build with glibc version 2.13 and older.
>
> It is actually an oversight of a previous tentative patch to implement this
> function. We can safely drop it.
>
> Reported-by: Mark Cave-Ayland <address@hidden>
> Signed-off-by: Greg Kurz <address@hidden>
> ---
> hw/9pfs/9p-local.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
> index ea9a1ced0394..45e9a1f9b0ca 100644
> --- a/hw/9pfs/9p-local.c
> +++ b/hw/9pfs/9p-local.c
> @@ -349,7 +349,7 @@ static int local_set_cred_passthrough(FsContext *fs_ctx,
> int dirfd,
> const char *name, FsCred *credp)
> {
> if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
> - AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) < 0) {
> + AT_SYMLINK_NOFOLLOW) < 0) {
> /*
> * If we fail to change ownership and if we are
> * using security model none. Ignore the error
>
>
Thanks Greg - this, along with the updated version of the previous patch
fixes the build for me.
Tested-by: Mark Cave-Ayland <address@hidden>
ATB,
Mark.