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authorStephen Smalley <sds@tycho.nsa.gov>2015-10-27 16:47:53 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-29 09:02:16 +0900
commit2cb202c1886ca363305fba82e340bdbd71387079 (patch)
tree0308d07d1ea45f7ac9d0dac94ea1b4a5cde83348 /drivers/spmi
parent169883a63eb7e34e8e1c92fd451f34a5635c29ad (diff)
lkdtm: fix ACCESS_USERSPACE test
Add a copy_to_user() call to the ACCESS_USERSPACE test prior to attempting direct dereferencing of the user address to ensure the page is present. Otherwise, a fault occurs on arm kernels even prior to the introduction of CONFIG_CPU_SW_DOMAIN_PAN, and there is no difference in behavior for CONFIG_CPU_SW_DOMAIN_PAN=n vs CONFIG_CPU_SW_DOMAIN_PAN=y. Before this change, for any value of CONFIG_CPU_SW_DOMAIN_PAN: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6fe8000 Unable to handle kernel paging request at virtual address b6fe8000 After this change, for CONFIG_CPU_SW_DOMAIN_PAN=n: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6efc000 lkdtm: attempting bad write at b6efc000 After this change, for CONFIG_CPU_SW_DOMAIN_PAN=y: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6f7d000 Unhandled fault: page domain fault (0x01b) at 0xb6f7d000 ... Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spmi')
0 files changed, 0 insertions, 0 deletions

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