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security_dac: Restore label on failed chown() attempt

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It's important to keep XATTRs untouched (well, in the same state
they were in when entering the function). Otherwise our
refcounting would be messed up.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2018-09-24 17:10:06 +02:00
parent f9a0019fea
commit 86def3c88c
1 changed files with 19 additions and 1 deletions
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20
src/security/security_dac.c
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@ -718,7 +718,25 @@ virSecurityDACSetOwnership(virSecurityManagerPtr mgr,
VIR_INFO("Setting DAC user and group on '%s' to '%ld:%ld'",
NULLSTR(src ? src->path : path), (long)uid, (long)gid);
return virSecurityDACSetOwnershipInternal(priv, src, path, uid, gid);
if (virSecurityDACSetOwnershipInternal(priv, src, path, uid, gid) < 0) {
virErrorPtr origerr;
virErrorPreserveLast(&origerr);
/* Try to restore the label. This is done so that XATTRs
* are left in the same state as when the control entered
* this function. However, if our attempt fails, there's
* not much we can do. XATTRs refcounting is fubar'ed and
* the only option we have is warn users. */
if (virSecurityDACRestoreFileLabelInternal(mgr, src, path) < 0)
VIR_WARN("Unable to restore label on '%s'. "
"XATTRs might have been left in inconsistent state.",
NULLSTR(src ? src->path : path));
virErrorRestore(&origerr);
return -1;
}
return 0;
}