github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-25 09:41:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

s390/mm: Fix handling of vmalloc area in do_secure_storage_access()

Browse Source 
Secure storage access exceptions in vmalloc area need to be handled
separately since virt_to_phys() does not work on such addresses. Given
that there cannot be a valid access let such exceptions fail
immediately. The kernel will either fixup or crash.

Tested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>> ---
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2026-07-20 10:58:30 +02:00 committed by Vasily Gorbik
parent 79ef8d384f
commit a2e5a9d853
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/mm/fault.c
View File

@ -438,6 +438,8 @@ void do_secure_storage_access(struct pt_regs *regs)
panic("Unexpected PGM 0x3d with TEID bit 61=0");
}
if (is_kernel_fault(regs)) {
if (is_vmalloc_addr((void *)addr))
return handle_fault_error_nolock(regs, 0);
folio = virt_to_folio((void *)addr);
if (unlikely(!folio_try_get(folio)))
return;