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13 June 2022, 11:31:42 UTC
Revision 899537b73557aafbdd11050b501cf54b4f5c45af authored by Gustavo A. R. Silva on 15 April 2019, 20:57:23 UTC, committed by David S. Miller on 17 April 2019, 04:01:45 UTC 
net: atm: Fix potential Spectre v1 vulnerabilities
 
arg is controlled by user-space, hence leading to a potential
exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

net/atm/lec.c:715 lec_mcast_attach() warn: potential spectre issue 'dev_lec' [r] (local cap)

Fix this by sanitizing arg before using it to index dev_lec.

Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].

[1] https://lore.kernel.org/lkml/20180423164740.GY17484@dhcp22.suse.cz/

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent ad910c7
History
Tip revision: 899537b73557aafbdd11050b501cf54b4f5c45af authored by Gustavo A. R. Silva on 15 April 2019, 20:57:23 UTC
net: atm: Fix potential Spectre v1 vulnerabilities
Tip revision: 899537b
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