Messages in this thread | | | Date | Wed, 26 Apr 2017 07:49:43 -0700 | From | Tony Lindgren <> | Subject | Re: [PATCH v2] misc: sram-exec: Use aligned fncpy instead of memcpy |
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* Dave Gerlach <d-gerlach@ti.com> [170410 07:55]: > Currently the sram-exec functionality, which allows allocation of > executable memory and provides an API to move code to it, is only > selected in configs for the ARM architecture. Based on commit > 5756e9dd0de6 ("ARM: 6640/1: Thumb-2: Symbol manipulation macros for > function body copying") simply copying a C function pointer address > using memcpy without consideration of alignment and Thumb is unsafe on > ARM platforms. > > The aforementioned patch introduces the fncpy macro which is a safe way > to copy executable code on ARM platforms, so let's make use of that here > rather than the unsafe plain memcpy that was previously used by > sram_exec_copy. Now sram_exec_copy will move the code to "dst" and > return an address that is guaranteed to be safely callable. > > In the future, architectures hoping to make use of the sram-exec > functionality must define an fncpy macro just as ARM has done to > guarantee or check for safe copying to executable memory before allowing > the arch to select CONFIG_SRAM_EXEC.
Looks good to me:
Acked-by: Tony Lindgren <tony@atomide.com>
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