Android Insmod Failed Exec Format Error
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up insmod: init_module failed (Exec format error) up vote 7 down vote favorite 2 I'm able to compile kernel module for Galaxy S4 Kernel 3.4.xx but I get following errors during module insertion. could someone please shed some light on what's missing here. The kernel module is a plain helloworld module with basic init and cleanup functions. insmod error: insmod /data/local/tmp/testHello.ko insmod: init_module could not insert exec format error '/data/local/tmp/testHello.ko' failed (Exec format error) Dmesg logs <4>[ 2127.554107] TIMA: lkmauth--launch the tzapp to check kernel module; module len is 71334 <4>[ 2127.554168] TIMA: lkmauth -- hdr before kreq is : e337b000 <4>[ 2127.554199] TIMA: lkmauth--send cmd (lkmauth) cmdlen(304:320), rsplen(264:320) id 0x00050000, req (0xE352A000), rsp(0xE352A140), module_start_addr(0xE337B000) module_len 71334 <3>[ 2127.581909] TIMA: lkmauth--verification failed -1 <4>[ 2127.582183] TIMA: MSG=lkm_modified; result (TIMA_RESULT=MSG=lkm_modified;) <6>[2129.417541] [debug_wake_locks]active wake lock msm_otg android linux module kernel share|improve this question asked May 15 '13 at 10:01 user12295 51124 add a comment| 1 Answer 1 active oldest votes up vote 8 down vote Your answer is right there in the dmesg log: The S4 kernel is hardened to only accept modules which are authenticated (i.e. digitally signed). Your compiled module is not thus signed, so init_module failed (though arguably the return code could have been better - exec format error usually means the ELF is malformed, which it technically isn't). Check the modules that came with the S4 (/system/lib/modules or /vendor/lib/modules) with mod info (on Linux), and you'll see the ELF section with the signature. This is a feature that mainstream Linux has also added, in
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3803: Kernel module compiled from source fails to load 3 people starred this issue and may be notified of changes. Back to list Status: Obsolete Owner: ---- Closed: Jun 2013 Type-Defect Priority-Medium Component-System Version-OpenSource Sign in to add a comment Reported by jimc.ucl...@gmail.com, Sep 6, 2009 Context: HTC Dev Phone 1 (G1) with Android v1.5 "Cupcake", showroom stock kernel 2.6.27-00392-g8312baf, SDK version from http:// developer.android.com/sdk/download.html?v=android-sdk-linux_x86-1.5_r3.zip Setup: 1. Downloaded the SDK. 2. Obtained the complete sources using repo, following the instructions in http://source.android.com/download 3. Created $HOME/android/out/kernel and set out=(this directory). 4. Copied /proc/config.gz from the phone (*THANK YOU* for including this; on Maemo it's like pulling teeth to find the actually used config). A blog post mentioned "goldfish_defconfig" but I couldn't locate it. 5. For the next two steps I used these command line arguments to make: make ARCH=arm O=$out CROSS_COMPILE=$HOME/android/prebuilt/linux-x86/ toolchain/arm-eabi-4.2.1/bin/arm-eabi- $target (I couldn't get 4.3.1 to work) 6. make ${args} xconfig In Network Device Support I turned on the tun/tap driver. Saved .config. I'm not sure at what point I figured out the processor version, or whether it got altered in one of my failed attempts not shown here, but the correct value is ARCH_MSM7X00A. 7. make ${args} modules (no significant complaints during compilation). 8. Copied $out/drivers/net/tun.ko to the phone's sdcard. Symptom: "insmod /sdcard/tun.ko" exudes the error message: insmod: init_module '/sdcard/tun.ko' failed (Exec format error) <3>[59764.465423] tun: version magic '2.6.27-00124-g0660cc5 preempt mod_unload ARMv6 ' should be '2.6.27-00392-g8312baf preempt mod_unload ARMv6 ' Why this is a bug: I'm not going to get litigatous on this, but I think your license requi