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gconcat: Zero the metadata block before writing

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Ensure that string buffers and pad bytes are zero-filled before writing
gconcat metadata.  Also make sure to zero the full block buffer before
encoding the metadata and writing.

Fix some style bugs in g_concat_write_metadata() while here.

Reported by:	KMSAN
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-07-13 17:45:59 -04:00
parent 7f053a44ae
commit 0f09ab89cc
1 changed files with 12 additions and 12 deletions
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24
sys/geom/concat/g_concat.c
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@ -865,6 +865,7 @@ g_concat_ctl_create(struct gctl_req *req, struct g_class *mp)
return;
}
bzero(&md, sizeof(md));
strlcpy(md.md_magic, G_CONCAT_MAGIC, sizeof(md.md_magic));
md.md_version = G_CONCAT_VERSION;
name = gctl_get_asciiparam(req, "arg0");
@ -876,7 +877,6 @@ g_concat_ctl_create(struct gctl_req *req, struct g_class *mp)
md.md_id = arc4random();
md.md_no = 0;
md.md_all = *nargs - 1;
bzero(md.md_provider, sizeof(md.md_provider));
/* This field is not important here. */
md.md_provsize = 0;
@ -1017,6 +1017,7 @@ g_concat_write_metadata(struct gctl_req *req, struct g_concat_softc *sc)
u_char *sector;
int error;
bzero(&md, sizeof(md));
strlcpy(md.md_magic, G_CONCAT_MAGIC, sizeof(md.md_magic));
md.md_version = G_CONCAT_VERSION;
strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name));
@ -1026,25 +1027,24 @@ g_concat_write_metadata(struct gctl_req *req, struct g_concat_softc *sc)
pp = disk->d_consumer->provider;
md.md_no = no;
bzero(md.md_provider, sizeof(md.md_provider));
if (disk->d_hardcoded) {
strlcpy(md.md_provider, pp->name, sizeof(md.md_provider));
}
if (disk->d_hardcoded)
strlcpy(md.md_provider, pp->name,
sizeof(md.md_provider));
md.md_provsize = disk->d_consumer->provider->mediasize;
sector = g_malloc(pp->sectorsize, M_WAITOK);
sector = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
concat_metadata_encode(&md, sector);
error = g_access(disk->d_consumer, 0, 1, 0);
if (error == 0) {
error = g_write_data(disk->d_consumer, pp->mediasize - pp->sectorsize,
sector, pp->sectorsize);
error = g_write_data(disk->d_consumer,
pp->mediasize - pp->sectorsize, sector,
pp->sectorsize);
(void)g_access(disk->d_consumer, 0, -1, 0);
}
g_free(sector);
if (error != 0) {
gctl_error(req, "Cannot store metadata on %s: %d", pp->name, error);
}
if (error != 0)
gctl_error(req, "Cannot store metadata on %s: %d",
pp->name, error);
no++;
}