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Xtensa updates for v7.0

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- fix unhandled case in the load/store fault handler on configurations
   with MMU
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Merge tag 'xtensa-20260219' of https://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa update from Max Filippov:

 - fix unhandled case in the load/store fault handler
   in configurations with MMU

* tag 'xtensa-20260219' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: align: validate access in fast_load_store
This commit is contained in:
Linus Torvalds 2026-02-20 09:16:09 -08:00
commit 9abf79529f
1 changed files with 8 additions and 2 deletions
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10
arch/xtensa/kernel/align.S
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@ -21,6 +21,9 @@
#include <asm/asm-offsets.h>
#include <asm/asmmacro.h>
#include <asm/processor.h>
#ifdef CONFIG_MMU
#include <asm/asm-uaccess.h>
#endif
#if XCHAL_UNALIGNED_LOAD_EXCEPTION || defined CONFIG_XTENSA_LOAD_STORE
#define LOAD_EXCEPTION_HANDLER
@ -185,8 +188,11 @@ ENTRY(fast_load_store)
#ifdef CONFIG_MMU
/* l32e can't be used here even when it's available. */
/* TODO access_ok(a3) could be used here */
j .Linvalid_instruction
rsr a6, ps
bbci.l a6, PS_UM_BIT, 1f # kernel mode
movi a5, 8
access_ok a3, a5, a6, a2, .Linvalid_instruction
1:
#endif
l32i a5, a3, 0
l32i a6, a3, 4