[PATCH v3] mkimage: fix segfault on MacOS arm64

[PATCH v3] mkimage: fix segfault on MacOS arm64

[Sergey V. Lobanov]

mkimage segfaults due to the ASLR mechanism on MacOS arm64

It is required to use _dyld_get_image_vmaddr_slide()
to prevent segfault on MacOS arm64

This patch is based on the discussion
https://github.com/u-boot/u-boot/commit/3b142045e8a7f0ab17b6099e9226296af45967d0

Thanks to Jessica Clarke, Ronny Kotzschmar and ptpt52 github user

Reviewed-by: Jessica Clarke <jrtc27@jrtc27.com>
Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>
---
Changes since version 2:
- Rebased on current master
- Added Reviewed-by tag
- Fixed typos and grammatical errors

 tools/imagetool.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/imagetool.h b/tools/imagetool.h
index b7ac3a23d0..45eaada4b5 100644
--- a/tools/imagetool.h
+++ b/tools/imagetool.h
@@ -272,11 +272,13 @@ int rockchip_copy_image(int fd, struct image_tool_params *mparams);
  *  b) we need a API call to get the respective section symbols */
 #if defined(__MACH__)
 #include <mach-o/getsect.h>
+#include <mach-o/dyld.h>
 
 #define INIT_SECTION(name)  do {					\
 		unsigned long name ## _len;				\
 		char *__cat(pstart_, name) = getsectdata("__DATA",	\
 			#name, &__cat(name, _len));			\
+		__cat(pstart_, name) += _dyld_get_image_vmaddr_slide(0);\
 		char *__cat(pstop_, name) = __cat(pstart_, name) +	\
 			__cat(name, _len);				\
 		__cat(__start_, name) = (void *)__cat(pstart_, name);	\
-- 
2.32.0 (Apple Git-132)

Re: [PATCH v3] mkimage: fix segfault on MacOS arm64

[Tom Rini]

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On Tue, Jan 25, 2022 at 02:29:44AM +0300, Sergey V. Lobanov wrote:

> mkimage segfaults due to the ASLR mechanism on MacOS arm64
> 
> It is required to use _dyld_get_image_vmaddr_slide()
> to prevent segfault on MacOS arm64
> 
> This patch is based on the discussion
> https://github.com/u-boot/u-boot/commit/3b142045e8a7f0ab17b6099e9226296af45967d0
> 
> Thanks to Jessica Clarke, Ronny Kotzschmar and ptpt52 github user
> 
> Reviewed-by: Jessica Clarke <jrtc27@jrtc27.com>
> Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>

Applied to u-boot/master, thanks!

-- 
Tom

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