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s390/mm: Use handle_fault_error() in do_secure_storage_access()

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Similar to the normal exception handler use handle_fault_error() which
handles accesses from user space and kernel space differently.

This also addresses failing kernel accesses via e.g. copy_from_user() to
user space: instead of an endless loop, the fixup handling is performed.
Even though this could only happen if arch_make_folio_accessible() would
permanently fail, which is not realistic.

Therefore this is rather a cleanup patch.

Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2026-07-20 10:58:32 +02:00
committed by Vasily Gorbik
parent ecb00aa6fb
commit da1f5a7dcf
1 changed files with 3 additions and 5 deletions
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8
arch/s390/mm/fault.c
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@@ -427,10 +427,8 @@ void do_secure_storage_access(struct pt_regs *regs)
* was not supposed to do, e.g. branching into secure
* memory. Trigger a segmentation fault.
*/
if (user_mode(regs)) {
send_sig(SIGSEGV, current, 0);
return;
}
if (user_mode(regs))
return handle_fault_error_nolock(regs, SEGV_ACCERR);
/*
* The kernel should never run into this case and
* there is no way out of this situation.
@@ -465,7 +463,7 @@ void do_secure_storage_access(struct pt_regs *regs)
folio_put(folio);
folio_walk_end(&fw, vma);
if (rc)
send_sig(SIGSEGV, current, 0);
return handle_fault_error(regs, SEGV_ACCERR);
mmap_read_unlock(mm);
}
}