android - insmod: init_module failed (Exec format error) -


i'm able compile kernel module galaxy s4 kernel 3.4.xx following errors during module insertion. please shed light on what's missing here.

the kernel module plain helloworld module basic init , cleanup functions.

insmod error:

   insmod /data/local/tmp/testhello.ko    insmod: init_module '/data/local/tmp/testhello.ko' failed (exec format error)

dmesg logs

   <4>[ 2127.554107] tima: lkmauth--launch tzapp check kernel module; module  len  71334    <4>[ 2127.554168] tima: lkmauth -- hdr before kreq : 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

your answer right there in dmesg log: s4 kernel hardened accept modules authenticated (i.e. digitally signed). compiled module not signed, init_module failed (though arguably return code have been better - exec format error means elf malformed, technically isn't).

check modules came s4 (/system/lib/modules or /vendor/lib/modules) mod info (on linux), , you'll see elf section signature. feature mainstream linux has added, in 3.7.


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