gmounie/ensimag-shell

Squelette pour le TP shell

ensimag-shell's Issues

Angle brackets and segfaults

• Having <<, <>, >> or >< anywhere in a command sets the memory to an unstable state, effectively causing it to crash on the next command input with the following error:

*** Error in `./ensishell': munmap_chunk(): invalid pointer: 0x0000000000403b28 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7b194)[0x7f5dce924194]
./ensishell(freecmd+0x29)[0x401e24]
./ensishell(parsecmd+0xf6)[0x401f56]
./ensishell(compute+0x18)[0x402444]
./ensishell(main+0x1a6)[0x403a64]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f5dce8cab15]
./ensishell[0x401799]

• Having any combination of three angled brackets, such as <<<, anywhere in a command causes the program to crash instantly, with the (slightly different) following error:

Error in `./ensishell': munmap_chunk(): invalid pointer: 0x0000000000403b28 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7b194)[0x7f67f5b20194]
./ensishell(parsecmd+0x591)[0x4023f1]
./ensishell(compute+0x18)[0x402444]
./ensishell(main+0x1a6)[0x403a64]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f67f5ac6b15]
./ensishell[0x401799]