[GUACAMOLE-441] guacd ssh plugin segfault when copy text to clipboard

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.9.13-incubating, 0.9.14, 1.0.0
• Fix Version/s: 1.1.0
• Component/s: SSH, Terminal
• Environment: GNU Linux x86_64
• Assignee: Mike Jumper
• Reporter: James He
• Created: 21/Nov/17 23:52
• Updated: 01/Jul/19 16:11
• Resolved: 18/Jun/18 15:59

Description

This segfault can be replicated each time when do the below steps.

• Login to any SSH server from guacamole.
• Try a command with much output e.g. "ps aux".
• Select the output text of the above command.
• SSH connection will be terminated immediately.
• Core dump of guacd will be generated.

Core was generated by `/sbin/guacd -f'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00002aaaabca8437 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00002aaaabca8437 in raise () from /lib64/libc.so.6
#1  0x00002aaaabca9818 in abort () from /lib64/libc.so.6
#2  0x00002aaaabce6574 in ?? () from /lib64/libc.so.6
#3  0x00002aaaabcebdae in ?? () from /lib64/libc.so.6
#4  0x00002aaaabcecab6 in ?? () from /lib64/libc.so.6
#5  0x00002aaaadb6b160 in __guac_terminal_send_mouse (term=0x2aaab401bf60, user=0x2aaab0002920, x=703, y=921,
    mask=0) at terminal.c:1715
#6  0x00002aaaadb6b2b5 in guac_terminal_send_mouse (term=0x2aaab401bf60, user=0x2aaab0002920, x=703, y=921, mask=0)
    at terminal.c:1753
#7  0x00002aaaadb5c532 in guac_ssh_user_mouse_handler (user=0x2aaab0002920, x=703, y=921, mask=0) at input.c:41
#8  0x00002aaaaaf4dc2e in __guac_handle_mouse (user=0x2aaab0002920, argc=3, argv=0x2aaab000adc0)
    at user-handlers.c:134
#9  0x00002aaaaaf4d3ea in guac_user_handle_instruction (user=0x2aaab0002920, opcode=0x2aaab0012b29 "mouse", argc=3,
    argv=0x2aaab000adc0) at user.c:178
#10 0x00000000004055e7 in guacd_user_input_thread (data=0x2aaaaf353d20) at user.c:127
#11 0x00002aaaab8521a4 in start_thread (arg=0x2aab0d029700) at pthread_create.c:309
#12 0x00002aaaabd5965d in clone () from /lib64/libc.so.6
(gdb) frame 5
#5  0x00002aaaadb6b160 in __guac_terminal_send_mouse (term=0x2aaab401bf60, user=0x2aaab0002920, x=703, y=921,
    mask=0) at terminal.c:1715
warning: Source file is more recent than executable.
1715                guac_common_clipboard_reset(term->clipboard, "text/plain");
(gdb) p term->clipboard->length
$6 = 9500

Issue Links

• is duplicated by: GUACAMOLE-833 SSH session is disconnected, when try to copy about 200 x 100 characters.
• is related to: GUACAMOLE-573 Allow selection of text in terminal while scrolling
• is superceded by: GUACAMOLE-573 Allow selection of text in terminal while scrolling