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fuse-overlayfs: create symlinks with the correct owner

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Closes: https://github.com/containers/libpod/issues/2091

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2019-01-07 09:56:48 +01:00
parent 623102c62d
commit bbc8181f59
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GPG Key ID: E4730F97F60286ED
1 changed files with 22 additions and 2 deletions
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24
main.c
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@ -2771,6 +2771,8 @@ ovl_symlink (fuse_req_t req, const char *link, fuse_ino_t parent, const char *na
char path[PATH_MAX + 10]; char path[PATH_MAX + 10];
int ret; int ret;
struct fuse_entry_param e; struct fuse_entry_param e;
const struct fuse_ctx *ctx = fuse_req_ctx (req);
char wd_tmp_file_name[32];
if (ovl_debug (req)) if (ovl_debug (req))
fprintf (stderr, "ovl_symlink(link=%s, ino=%" PRIu64 "s, name=%s)\n", link, parent, name); fprintf (stderr, "ovl_symlink(link=%s, ino=%" PRIu64 "s, name=%s)\n", link, parent, name);
@ -2796,14 +2798,32 @@ ovl_symlink (fuse_req_t req, const char *link, fuse_ino_t parent, const char *na
return; return;
} }
if (delete_whiteout (lo, -1, pnode, name) < 0) sprintf (wd_tmp_file_name, "%lu", get_next_wd_counter ());
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
ret = symlinkat (link, lo->workdir_fd, wd_tmp_file_name);
if (ret < 0)
{ {
fuse_reply_err (req, errno); fuse_reply_err (req, errno);
return; return;
} }
if (fchownat (lo->workdir_fd, wd_tmp_file_name, get_uid (lo, ctx->uid), get_gid (lo, ctx->gid), AT_SYMLINK_NOFOLLOW) < 0)
{
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
fuse_reply_err (req, errno);
return;
}
if (delete_whiteout (lo, -1, pnode, name) < 0)
{
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
fuse_reply_err (req, errno);
return;
}
sprintf (path, "%s/%s", pnode->path, name); sprintf (path, "%s/%s", pnode->path, name);
ret = symlinkat (link, get_upper_layer (lo)->fd, path); ret = renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, path);
if (ret < 0) if (ret < 0)
{ {
fuse_reply_err (req, errno); fuse_reply_err (req, errno);