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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.227.17.12; envelope-from=lukasstraub2@web.de; helo=mout.web.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Vladimir Sementsov-Ogievskiy , qemu-block , Wen Congyang , Xie Changlong , Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1626037040562100001 --Sig_/C_c0l9xa4STrqYEksN8rqbd Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The replication driver needs access to the children block-nodes of it's child so it can issue bdrv_make_empty() and bdrv_co_pwritev() to manage the replication. However, it does this by directly copying the BdrvChilds, which is wrong. Fix this by properly attaching the block-nodes with bdrv_attach_child() and requesting the required permissions. This ultimatively fixes a potential crash in replication_co_writev(), because it may write to s->secondary_disk if it is in state BLOCK_REPLICATION_FAILOVER_FAILED, without requesting write permissions first. And now the workaround in secondary_do_checkpoint() can be removed. Signed-off-by: Lukas Straub Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/replication.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/block/replication.c b/block/replication.c index 25bbdf5d4b..b74192f795 100644 --- a/block/replication.c +++ b/block/replication.c @@ -165,7 +165,12 @@ static void replication_child_perm(BlockDriverState *b= s, BdrvChild *c, uint64_t perm, uint64_t shared, uint64_t *nperm, uint64_t *nshared) { - *nperm =3D BLK_PERM_CONSISTENT_READ; + if (role & BDRV_CHILD_PRIMARY) { + *nperm =3D BLK_PERM_CONSISTENT_READ; + } else { + *nperm =3D 0; + } + if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) =3D=3D BDRV_O_R= DWR) { *nperm |=3D BLK_PERM_WRITE; } @@ -557,8 +562,25 @@ static void replication_start(ReplicationState *rs, Re= plicationMode mode, return; } - s->hidden_disk =3D hidden_disk; - s->secondary_disk =3D secondary_disk; + bdrv_ref(hidden_disk->bs); + s->hidden_disk =3D bdrv_attach_child(bs, hidden_disk->bs, "hidden = disk", + &child_of_bds, BDRV_CHILD_DATA, + &local_err); + if (local_err) { + error_propagate(errp, local_err); + aio_context_release(aio_context); + return; + } + + bdrv_ref(secondary_disk->bs); + s->secondary_disk =3D bdrv_attach_child(bs, secondary_disk->bs, + "secondary disk", &child_of_= bds, + BDRV_CHILD_DATA, &local_err); + if (local_err) { + error_propagate(errp, local_err); + aio_context_release(aio_context); + return; + } /* start backup job now */ error_setg(&s->blocker, @@ -664,7 +686,9 @@ static void replication_done(void *opaque, int ret) if (ret =3D=3D 0) { s->stage =3D BLOCK_REPLICATION_DONE; + bdrv_unref_child(bs, s->secondary_disk); s->secondary_disk =3D NULL; + bdrv_unref_child(bs, s->hidden_disk); s->hidden_disk =3D NULL; s->error =3D 0; } else { -- 2.20.1 --Sig_/C_c0l9xa4STrqYEksN8rqbd Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEg/qxWKDZuPtyYo+kNasLKJxdslgFAmDrWtcACgkQNasLKJxd slgMDg/+KK/dRY94xiJhCFJURI5kH9s52uvW+mdirJA+h4t+HluCcTDh/+EjDYEX nZm4+GpecKIn6iqpq4qzazECA9IdIatySpxidYF7/7v9bktpQQSsGHnxaLQeyNl+ bHGsr0QCxbbEcrczXz+i1SNB/potwaxy742enhB41gufJkmiYlSKP650JWyJirzd oex/KySj25WfwOIZYRwahGlKeHeaffayyWM7V6b4dsH090hBwff18+bJK782k9qM 7rTfCr60ud4YqO1FweqvBUsRQvPl96C0gGPrp7wGznt95tj8qfmUTbzAI0wt7YEr WghghoYLn10n7tOoERWG4WuNwDjYmr0Q9q66QwgHTDxTbvN3hjePu3gCjfSY8Ko1 qKX44Kz/3E3h8jFSA2YEa476l297YCwP/1Y4PMLpTbT7e6X5drAoltHeMKWMli2j gNjUubBlyinarMYj0/yWhglw2+9RHWig4HE+HHHRHDQjk+4hdhuPbjsg1imcaJHX /pLlZnFk9r0STW5xgspEFg68StQPCjfUaTpyQz2TfhSMCclQPM33gc6CHDWA1AXc 1byMK38fuVK8CgbuzoZNEHOa4ovyKUTbEGkuIuyngm/Fu0ybQ9c1x3VYoAA6sYPT 0ReoNhrUbD9s60mr+DiYTHPD2RIN8ldQOPyRpUnU+qKwrnfskWc= =873q -----END PGP SIGNATURE----- --Sig_/C_c0l9xa4STrqYEksN8rqbd--