_attribute_ ((noreturn)) internal_function In the same GNU library i also found fortify_fail.c #include So this code simply calls _fortify_fail with argument “smash the stack”. I found this source code form GNU C Library at debug/stack_chk_fail.c Even you can find it from this link _fortify_fail ("stack smashing detected") #includeĮxtern char **_libc_argv attribute_hidden ![]() Lets see what does that function contain. if not library routine is beginning called through the PLT. Than after the “print” operation there is check of canary value that can be seen in line 11, 12 in the case of same value it is moved to 15th line and then return the program normally. When you look at line 5 you could see that some value from global section is moved to $eax and in the next line it is pushed on to the stack. gcc -m32 -fstack-protector-all hello.c -o hello Later i started working on it with a small HelloWorld program which has canary enabled. ![]() ![]() Recently i was thinking about on how does the canary work in Linux Glibc.
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