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nvme: prevent potential spectre v1 gadget

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[ 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@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nitesh Shetty 2023-11-28 17:59:57 +05:30 committed by Greg Kroah-Hartman
parent df2bd52354
commit ce97686124
1 changed files with 3 additions and 0 deletions
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3
drivers/nvme/target/configfs.c
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@ -16,6 +16,7 @@
#endif
#include <crypto/hash.h>
#include <crypto/kpp.h>
#include <linux/nospec.h>
#include "nvmet.h"
@ -508,6 +509,7 @@ 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]--;
@ -1580,6 +1582,7 @@ 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);