This is a note to let you know that I've just added the patch titled
nvme: prevent potential spectre v1 gadget
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nvme-prevent-potential-spectre-v1-gadget.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b64ff944cd2e040c551ceb7edcdfc28b32401dd6
Author: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Date: Tue Nov 28 17:59:57 2023 +0530
nvme: prevent potential spectre v1 gadget
[ Upstream commit 20dc66f2d76b4a410df14e4675e373b718babc34 ]
This patch fixes the smatch warning, "nvmet_ns_ana_grpid_store() warn:
potential spectre issue 'nvmet_ana_group_enabled' [w] (local cap)"
Prevent the contents of kernel memory from being leaked to user space
via speculative execution by using array_index_nospec.
Signed-off-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 907143870da5..01b2a3d1a5e6 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -17,6 +17,7 @@
#endif
#include <crypto/hash.h>
#include <crypto/kpp.h>
+#include <linux/nospec.h>
#include "nvmet.h"
@@ -509,6 +510,7 @@ static ssize_t nvmet_ns_ana_grpid_store(struct config_item *item,
down_write(&nvmet_ana_sem);
oldgrpid = ns->anagrpid;
+ newgrpid = array_index_nospec(newgrpid, NVMET_MAX_ANAGRPS);
nvmet_ana_group_enabled[newgrpid]++;
ns->anagrpid = newgrpid;
nvmet_ana_group_enabled[oldgrpid]--;
@@ -1700,6 +1702,7 @@ static struct config_group *nvmet_ana_groups_make_group(
grp->grpid = grpid;
down_write(&nvmet_ana_sem);
+ grpid = array_index_nospec(grpid, NVMET_MAX_ANAGRPS);
nvmet_ana_group_enabled[grpid]++;
up_write(&nvmet_ana_sem);
