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0a7673d202
This reverts commit 3a4e2376e4.
The reverted commit caused the fix for CVE-2016-9602 not to be applied
for qemu_test because it conflicts with the force-uid0-on-9p.patch.
So with the rebase of the patch on top of the changes of the
CVE-2016-9602.patch, both patches no longer conflict with each other.
I've tested this with the "misc" NixOS test and it succeeds.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
81 lines
2.8 KiB
Diff
81 lines
2.8 KiB
Diff
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
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index 45e9a1f9b0..494ee00c66 100644
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--- a/hw/9pfs/9p-local.c
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+++ b/hw/9pfs/9p-local.c
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@@ -84,6 +84,23 @@ static void unlinkat_preserve_errno(int dirfd, const char *path, int flags)
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#define VIRTFS_META_DIR ".virtfs_metadata"
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+static int is_in_store_path(const char *path)
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+{
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+ static char *store_path = NULL;
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+ int store_path_len = -1;
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+
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+ if (store_path_len == -1) {
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+ if ((store_path = getenv("NIX_STORE")) != NULL)
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+ store_path_len = strlen(store_path);
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+ else
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+ store_path_len = 0;
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+ }
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+
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+ if (store_path_len > 0)
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+ return strncmp(path, store_path, strlen(store_path)) == 0;
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+ return 0;
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+}
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+
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static FILE *local_fopenat(int dirfd, const char *name, const char *mode)
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{
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int fd, o_mode = 0;
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@@ -161,6 +178,8 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
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if (err) {
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goto err_out;
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}
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+ stbuf->st_uid = 0;
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+ stbuf->st_gid = 0;
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
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/* Actual credentials are part of extended attrs */
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uid_t tmp_uid;
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@@ -280,6 +299,9 @@ static int fchmodat_nofollow(int dirfd, const char *name, mode_t mode)
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{
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int fd, ret;
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+ if (is_in_store_path(name))
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+ return 0;
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+
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/* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW).
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* Unfortunately, the linux kernel doesn't implement it yet. As an
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* alternative, let's open the file and use fchmod() instead. This
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@@ -661,6 +683,8 @@ static int local_fstat(FsContext *fs_ctx, int fid_type,
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if (err) {
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return err;
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}
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+ stbuf->st_uid = 0;
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+ stbuf->st_gid = 0;
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if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
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/* Actual credentials are part of extended attrs */
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uid_t tmp_uid;
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@@ -795,8 +819,11 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
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if (err) {
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goto out;
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}
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- err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
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- AT_SYMLINK_NOFOLLOW);
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+ if (is_in_store_path(name))
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+ err = 0;
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+ else
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+ err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
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+ AT_SYMLINK_NOFOLLOW);
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if (err == -1) {
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/*
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* If we fail to change ownership and if we are
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@@ -911,7 +938,9 @@ static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
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goto out;
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}
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- if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
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+ if (is_in_store_path(name)) {
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+ ret = 0;
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+ } else if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
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(fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
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(fs_ctx->export_flags & V9FS_SM_NONE)) {
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ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
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