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lib/sysroot: Call chmod on overlay dirs when unlocking

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Otherwise, we'll be subject to whatever `umask` is currently. Normally,
processes should respect `umask` when creating files and directories,
but specifically for `ostree admin unlock` (or `rpm-ostree usroverlay`),
this poses a problem since e.g. a `/usr` with mode 0700 will break any
daemon that doesn't run as root and needs to read files under `/usr`,
such as polkitd.

This patch just does a `chmod()` after the `mkdir()`. An alternative
would be to do `umask(0000)` after forking into the child process
that'll call `mount()`, but that'd require also moving the `mkdir()`
calls into there, making for a more intrusive patch.

Closes: #1843
Approved by: cgwalters
This commit is contained in:
Jonathan Lebon 2019-04-23 16:03:48 -04:00 committed by Atomic Bot
parent 498a8bd404
commit 794f75ca61
1 changed files with 20 additions and 4 deletions
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24
src/libostree/ostree-sysroot.c
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@ -1699,6 +1699,22 @@ clone_deployment (OstreeSysroot *sysroot,
return TRUE;
}
/* Do `mkdir()` followed by `chmod()` immediately afterwards to ensure `umask()` isn't
* masking permissions where we don't want it to. Thus we avoid calling `umask()`, which
* would affect the whole process. */
static gboolean mkdir_unmasked (int dfd,
const char *path,
int mode,
GCancellable *cancellable,
GError **error)
{
if (!glnx_shutil_mkdir_p_at (dfd, path, mode, cancellable, error))
return FALSE;
if (fchmodat (dfd, path, mode, 0) < 0)
return glnx_throw_errno_prefix (error, "chmod(%s)", path);
return TRUE;
}
/**
* ostree_sysroot_deployment_unlock:
* @self: Sysroot
@ -1768,9 +1784,9 @@ ostree_sysroot_deployment_unlock (OstreeSysroot *self,
* directly for hotfixes. The ostree-prepare-root.c helper
* is also set up to detect and mount these.
*/
if (!glnx_shutil_mkdir_p_at (deployment_dfd, ".usr-ovl-upper", 0755, cancellable, error))
if (!mkdir_unmasked (deployment_dfd, ".usr-ovl-upper", 0755, cancellable, error))
return FALSE;
if (!glnx_shutil_mkdir_p_at (deployment_dfd, ".usr-ovl-work", 0755, cancellable, error))
if (!mkdir_unmasked (deployment_dfd, ".usr-ovl-work", 0755, cancellable, error))
return FALSE;
ovl_options = hotfix_ovl_options;
}
@ -1796,10 +1812,10 @@ ostree_sysroot_deployment_unlock (OstreeSysroot *self,
}
development_ovl_upper = glnx_strjoina (development_ovldir, "/upper");
if (!glnx_shutil_mkdir_p_at (AT_FDCWD, development_ovl_upper, 0755, cancellable, error))
if (!mkdir_unmasked (AT_FDCWD, development_ovl_upper, 0755, cancellable, error))
return FALSE;
development_ovl_work = glnx_strjoina (development_ovldir, "/work");
if (!glnx_shutil_mkdir_p_at (AT_FDCWD, development_ovl_work, 0755, cancellable, error))
if (!mkdir_unmasked (AT_FDCWD, development_ovl_work, 0755, cancellable, error))
return FALSE;
ovl_options = glnx_strjoina ("lowerdir=usr,upperdir=", development_ovl_upper,
",workdir=", development_ovl_work);