9/23/2023 0 Comments Stack smashing detected![]() ![]() # Put the 8 byte canary from %fs:0x28 to -0x8(%rbp), Now we look at the disassembly: objdump -D a.out ![]() Like -fstack-protector except that all functions are protected. Only variables that are actually allocated on the stack are considered, optimized away variables or variables allocated in registers don’t count. If a guard check fails, an error message is printed and the program exits. The guards are initialized when a function is entered and then checked when the function exits. This includes functions that call “alloca”, and functions with buffers larger than or equal to 8 bytes. This is done by adding a guard variable to functions with vulnerable objects. man gcc clarifies that as suggested by the option name, the -all version adds checks more aggressively, and therefore presumably incurs a larger performance loss:Įmit extra code to check for buffer overflows, such as stack smashing attacks. On Ubuntu 16.04, GCC 6.4.0, I could reproduce with -fstack-protector instead of -fstack-protector-all, but it stopped blowing up when I tested on GCC 10.2.0 as per Geng Jiawen’s comment. *** stack smashing detected ***: terminated ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |