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habanalabs: block scalar load_and_exe on external queue

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In Gaudi, the user can't execute scalar load_and_exe on external queue
because it can be a security hole. The driver doesn't parse the commands
being loaded and it can be msg_prot, which the user isn't allowed to use.

Reviewed-by: Tomer Tayar <ttayar@habana.ai>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Oded Gabbay 2020-05-27 12:38:16 +03:00
parent 8c289ea064
commit 64536abc62
2 changed files with 27 additions and 1 deletions
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25
drivers/misc/habanalabs/gaudi/gaudi.c
View File

@ -3790,6 +3790,25 @@ static int gaudi_validate_dma_pkt_no_mmu(struct hl_device *hdev,
src_in_host);
}
static int gaudi_validate_load_and_exe_pkt(struct hl_device *hdev,
struct hl_cs_parser *parser,
struct packet_load_and_exe *user_pkt)
{
u32 cfg;
cfg = le32_to_cpu(user_pkt->cfg);
if (cfg & GAUDI_PKT_LOAD_AND_EXE_CFG_DST_MASK) {
dev_err(hdev->dev,
"User not allowed to use Load and Execute\n");
return -EPERM;
}
parser->patched_cb_size += sizeof(struct packet_load_and_exe);
return 0;
}
static int gaudi_validate_cb(struct hl_device *hdev,
struct hl_cs_parser *parser, bool is_mmu)
{
@ -3838,6 +3857,11 @@ static int gaudi_validate_cb(struct hl_device *hdev,
rc = -EPERM;
break;
case PACKET_LOAD_AND_EXE:
rc = gaudi_validate_load_and_exe_pkt(hdev, parser,
(struct packet_load_and_exe *) user_pkt);
break;
case PACKET_LIN_DMA:
parser->contains_dma_pkt = true;
if (is_mmu)
@ -3855,7 +3879,6 @@ static int gaudi_validate_cb(struct hl_device *hdev,
case PACKET_FENCE:
case PACKET_NOP:
case PACKET_ARB_POINT:
case PACKET_LOAD_AND_EXE:
parser->patched_cb_size += pkt_size;
break;

3
drivers/misc/habanalabs/include/gaudi/gaudi_packets.h
View File

@ -197,6 +197,9 @@ struct packet_wait {
__le32 ctl;
};
#define GAUDI_PKT_LOAD_AND_EXE_CFG_DST_SHIFT 0
#define GAUDI_PKT_LOAD_AND_EXE_CFG_DST_MASK 0x00000001
struct packet_load_and_exe {
__le32 cfg;
__le32 ctl;