On Mon, Sep 7, 2020 at 5:56 AM Xu, Yanfei <yanfei...@windriver.com> wrote:
>
> Hi Bruce,
>
>
> When I excuted "make -C /usr/src/kernel scripts prepare" on target
> mechine, I will be asked for choicing if to enable "GCC_PLUGINS" and
> other configurations depend on "GCC_PLUGINS" (The .config file didn,t
> contain 'GCC_PLUGINS is not set')
> But there were never be asked for these before yocto add the
> configuration which is "EXTRA_OEMAKE += " HOSTCXX="${BUILD_CXX}
> ${BUILD_CXXFLAGS} ${BUILD_LDFLAGS}""
>Which machine and configuration are you seeing that in ? I've modified devsrc several times to remove the triggers that cause that behaviour, and would like to see how it crept back in. > With these, I met a failure during compiling an external module on > target mechine after I enabled the GCC_PLUGINS and > CONFIG_GCC_PLUGIN_RANDSTRUCT by above methond. Failure messages as > below. There might be some other unexpected situations with GCC_PLUGIN > enabled. > > In my oppinion, GCC_PLUGINS is rarely used, and It can be enable by who > want to use it. So how about disable it by defualt in > ktypes/base/base.cfg file? Do you think it is appropriate? I don't disagree, but also, the configuration phase shouldn't be triggered on target, so I'll fix that behaviour first. Bruce > > > > Regards, > Yanfei > > > ============================================================= > > $ make -C /usr/src/kernel scripts prepare > ...... > \ * GCC plugins > * > GCC plugins (GCC_PLUGINS) [Y/n/?] (NEW) y > Generate some entropy during boot and runtime > (GCC_PLUGIN_LATENT_ENTROPY) [N/y/?] (NEW) y > Randomize layout of sensitive kernel structures (GCC_PLUGIN_RANDSTRUCT) > [N/y/?] (NEW) y > Use cacheline-aware structure randomization > (GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) [N/y/?] (NEW) y > * > \ * Memory initialization > * > Initialize kernel stack variables at function entry > > 1. no automatic initialization (weakest) (INIT_STACK_NONE) > 2. zero-init structs marked for userspace (weak) > (GCC_PLUGIN_STRUCTLEAK_USER) (NEW) > 3. zero-init structs passed by reference (strong) > (GCC_PLUGIN_STRUCTLEAK_BYREF) (NEW) > 4. zero-init anything passed by reference (very strong) > (GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) (NEW) > choice[1-4?]: 1 > Poison kernel stack before returning from syscalls > (GCC_PLUGIN_STACKLEAK) [N/y/?] (NEW) y > Minimum stack frame size of functions tracked by STACKLEAK > (STACKLEAK_TRACK_MIN_SIZE) [100] (NEW) > Show STACKLEAK metrics in the /proc file system (STACKLEAK_METRICS) > [N/y/?] (NEW) y > Allow runtime disabling of kernel stack erasing > (STACKLEAK_RUNTIME_DISABLE) [N/y/?] (NEW) y > Enable heap memory zeroing on allocation by default > (INIT_ON_ALLOC_DEFAULT_ON) [N/y/?] n > Enable heap memory zeroing on free by default (INIT_ON_FREE_DEFAULT_ON) > [N/y/?] n > > HOSTCC scripts/dtc/dtc.o > ...... > == > then build the module, > == > $ make -C /usr/src/kernel M=/module_path/module_example modules > Build external kernel module ... > make: Entering directory '/lib/modules/5.4.57-yocto-standard/build' > CC [M] /module_path/module_example/hello.o > Building modules, stage 2. > MODPOST 1 modules > ERROR: "module_layout" [/module_path/module_example/hello.ko] undefined! > make[1]: *** [scripts/Makefile.modpost:94: __modpost] Error 1 > make: *** [Makefile:1630: modules] Error 2 > make: Leaving directory '/lib/modules/5.4.57-yocto-standard/build' > == -- - Thou shalt not follow the NULL pointer, for chaos and madness await thee at its end - "Use the force Harry" - Gandalf, Star Trek II
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