git: b785ac18c7d3 - stable/13 - geli: Fix geli setkey -J for detached providers

The branch stable/13 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=b785ac18c7d36cfa84ce8ff8705dc10edd7d2013

commit b785ac18c7d36cfa84ce8ff8705dc10edd7d2013
Author:     Arjan de Vet <freebsd@devet.org>
AuthorDate: 2023-08-28 14:54:18 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2023-09-04 12:55:15 +0000

    geli: Fix geli setkey -J for detached providers
    
    Clear cached_passphrase before generating a new key, otherwise the
    operation nonsensically tries to reuse the old passphrase.
    
    PR:             254966
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/780
    MFC after:      1 week
    
    (cherry picked from commit 88d13bf33754bd4b0c5df92eef83d6fadb9b4944)
---
 lib/geom/eli/geom_eli.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/geom/eli/geom_eli.c b/lib/geom/eli/geom_eli.c
index 6cbb23230fa5..1efb760830c4 100644
--- a/lib/geom/eli/geom_eli.c
+++ b/lib/geom/eli/geom_eli.c
@@ -1421,6 +1421,12 @@ eli_setkey_detached(struct gctl_req *req, const char *prov,
 	bcopy(mkey, mkeydst, sizeof(mkey));
 	explicit_bzero(mkey, sizeof(mkey));
 
+	/*
+	 * The previous eli_genkey() set cached_passphrase, we do not want to
+	 * use that for the new passphrase so always prompt for it
+	 */
+	explicit_bzero(cached_passphrase, sizeof(cached_passphrase));
+
 	/* Generate key for Master Key encryption. */
 	if (eli_genkey_single(req, md, key, true) == NULL) {
 		explicit_bzero(key, sizeof(key));