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9p: Properly check/translate flags in unlinkat

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The 9p-local code previously relied on P9_DOTL_AT_REMOVEDIR and AT_REMOVEDIR
having the same numerical value and deferred any errorchecking to the
syscall itself. However, while the former assumption is true on Linux,
it is not true in general. 9p-handle did this properly however. Move
the translation code to the generic 9p server code and add an error
if unrecognized flags are passed.

Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
Keno Fischer 2018-06-07 12:17:22 +02:00 committed by Greg Kurz
parent 5b7b2f9a85
commit 67e8734574
2 changed files with 12 additions and 9 deletions
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8
hw/9pfs/9p-handle.c
View File

@ -559,19 +559,13 @@ static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
{
int dirfd, ret;
HandleData *data = (HandleData *) ctx->private;
int rflags;
dirfd = open_by_handle(data->mountfd, dir->data, O_PATH);
if (dirfd < 0) {
return dirfd;
}
rflags = 0;
if (flags & P9_DOTL_AT_REMOVEDIR) {
rflags |= AT_REMOVEDIR;
}
ret = unlinkat(dirfd, name, rflags);
ret = unlinkat(dirfd, name, flags);
close(dirfd);
return ret;

13
hw/9pfs/9p.c
View File

@ -2522,7 +2522,7 @@ static void coroutine_fn v9fs_unlinkat(void *opaque)
{
int err = 0;
V9fsString name;
int32_t dfid, flags;
int32_t dfid, flags, rflags = 0;
size_t offset = 7;
V9fsPath path;
V9fsFidState *dfidp;
@ -2549,6 +2549,15 @@ static void coroutine_fn v9fs_unlinkat(void *opaque)
goto out_nofid;
}
if (flags & ~P9_DOTL_AT_REMOVEDIR) {
err = -EINVAL;
goto out_nofid;
}
if (flags & P9_DOTL_AT_REMOVEDIR) {
rflags |= AT_REMOVEDIR;
}
dfidp = get_fid(pdu, dfid);
if (dfidp == NULL) {
err = -EINVAL;
@ -2567,7 +2576,7 @@ static void coroutine_fn v9fs_unlinkat(void *opaque)
if (err < 0) {
goto out_err;
}
err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags);
if (!err) {
err = offset;
}