From: Daniel J Walsh <dwalsh@redhat.com>
To: SE Linux <selinux@tycho.nsa.gov>
Subject: Problem with the previous libsemanage patch.
Date: Fri, 16 Jan 2009 07:46:04 -0500 [thread overview]
Message-ID: <4970818C.70205@redhat.com> (raw)
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The libsemanage patch I sent attempts a link before doing the copy.
The idea here is to save space whenever possible. The big win is when
we create the sandbox. Since this copies all of the module files even
though it usually does not replace them.
The link can cause a problem where it links to files together with
different file context. For example, on initial install the
/etc/selinux/targeted/seusers file ends up a link to
/etc/selinux/targeted/modules/active/seusers. We end up with the file
labeled semanage_store_t, instead of selinux_config_t and login programs
are not allowed to read the file. This patch removes the link code, and
only does it for the copy_dir, which is used to make a copy of the
sandbox. The sandbox and active have the same label so this is not a
problem.
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diff --exclude-from=exclude -N -u -r nsalibsemanage/src/semanage_store.c libsemanage-2.0.31/src/semanage_store.c
--- nsalibsemanage/src/semanage_store.c 2009-01-13 08:45:35.000000000 -0500
+++ libsemanage-2.0.31/src/semanage_store.c 2009-01-15 15:53:46.000000000 -0500
@@ -440,8 +440,6 @@
char tmp[PATH_MAX];
char buf[4192];
- if (link(src,dst) == 0) return 0;
-
n = snprintf(tmp, PATH_MAX, "%s.tmp", dst);
if (n < 0 || n >= PATH_MAX)
return -1;
@@ -509,7 +507,8 @@
goto cleanup;
}
} else if (S_ISREG(sb.st_mode)) {
- if (semanage_copy_file(path, path2, sb.st_mode) == -1) {
+ if ((link(path,path2) == -1) &&
+ (semanage_copy_file(path, path2, sb.st_mode) == -1)) {
goto cleanup;
}
}
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reply other threads:[~2009-01-16 12:46 UTC|newest]
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