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| author | Janosch Frank <frankja@linux.ibm.com> | 2021-01-12 13:40:53 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-07-05 13:44:23 +0300 |
| commit | 85b18d7b5e7ffefb2f076186511d39c4990aa005 (patch) | |
| tree | b725f7f8392d85e231b4f5c26c0c816ba75c87d1 /arch/s390/boot/uv.c | |
| parent | 47f7c6cf0082e1d963d1761b6bc2a94480fc8671 (diff) | |
| download | linux-85b18d7b5e7ffefb2f076186511d39c4990aa005.tar.xz | |
s390: mm: Fix secure storage access exception handling
Turns out that the bit 61 in the TEID is not always 1 and if that's
the case the address space ID and the address are
unpredictable. Without an address and its address space ID we can't
export memory and hence we can only send a SIGSEGV to the process or
panic the kernel depending on who caused the exception.
Unfortunately bit 61 is only reliable if we have the "misc" UV feature
bit.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 084ea4d611a3d ("s390/mm: add (non)secure page access exceptions handlers")
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/boot/uv.c')
| -rw-r--r-- | arch/s390/boot/uv.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c index 82b99b916243..f6b0c4f43c99 100644 --- a/arch/s390/boot/uv.c +++ b/arch/s390/boot/uv.c @@ -36,6 +36,7 @@ void uv_query_info(void) uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE); uv_info.max_num_sec_conf = uvcb.max_num_sec_conf; uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id; + uv_info.uv_feature_indications = uvcb.uv_feature_indications; } #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST |