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From: Vivek Goyal <vgoyal@redhat.com>
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Date: Mon, 27 Jan 2020 19:01:31 +0000
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Subject: [PATCH] virtiofsd: Parse flag FUSE_WRITE_KILL_PRIV
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Caller can set FUSE_WRITE_KILL_PRIV in write_flags. Parse it and pass it
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to the filesystem.
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Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
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Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
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Reviewed-by: Sergio Lopez <slp@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit f779bc5265e7e7abb13a03d4bfbc74151afc15c2)
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---
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tools/virtiofsd/fuse_common.h | 6 +++++-
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tools/virtiofsd/fuse_lowlevel.c | 4 +++-
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2 files changed, 8 insertions(+), 2 deletions(-)
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diff --git a/tools/virtiofsd/fuse_common.h b/tools/virtiofsd/fuse_common.h
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index f8f6433743..686c42c0a5 100644
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--- a/tools/virtiofsd/fuse_common.h
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+++ b/tools/virtiofsd/fuse_common.h
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@@ -93,8 +93,12 @@ struct fuse_file_info {
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*/
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unsigned int cache_readdir:1;
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+ /* Indicates that suid/sgid bits should be removed upon write */
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+ unsigned int kill_priv:1;
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+
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+
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/** Padding. Reserved for future use*/
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- unsigned int padding:25;
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+ unsigned int padding:24;
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unsigned int padding2:32;
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/*
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diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
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index 02e1d83038..2d6dc5a680 100644
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--- a/tools/virtiofsd/fuse_lowlevel.c
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+++ b/tools/virtiofsd/fuse_lowlevel.c
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@@ -1142,6 +1142,7 @@ static void do_write(fuse_req_t req, fuse_ino_t nodeid,
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memset(&fi, 0, sizeof(fi));
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fi.fh = arg->fh;
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fi.writepage = (arg->write_flags & FUSE_WRITE_CACHE) != 0;
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+ fi.kill_priv = !!(arg->write_flags & FUSE_WRITE_KILL_PRIV);
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fi.lock_owner = arg->lock_owner;
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fi.flags = arg->flags;
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@@ -1177,7 +1178,8 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid,
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fi.lock_owner = arg->lock_owner;
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fi.flags = arg->flags;
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fi.fh = arg->fh;
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- fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;
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+ fi.writepage = !!(arg->write_flags & FUSE_WRITE_CACHE);
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+ fi.kill_priv = !!(arg->write_flags & FUSE_WRITE_KILL_PRIV);
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if (ibufv->count == 1) {
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assert(!(tmpbufv.buf[0].flags & FUSE_BUF_IS_FD));
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