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access already freed memory when resize window
- X-seq: zsh-workers 38190
- From: comic fans <comicfans44@xxxxxxxxx>
- To: zsh-workers@xxxxxxx
- Subject: access already freed memory when resize window
- Date: Sun, 20 Mar 2016 21:57:33 +0800
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when resizing,
zle_main.c: in function reexpandprompt
will call
free(lpromptbuf); ------> already free
then call
lpromptbuf = promptexpand ....
but call stack will then reach zle_refresh.c
resetvideo line 754
call
countprompt (lpromptbuf, .... ----------> access invalid memory
I've confirm this bug in version 5.2 and latest git version
address sanitizer report
==26994==ERROR: AddressSanitizer: heap-use-after-free on address
0x61100079d8c0 at pc 0x513f5f bp 0x7ffcfb207820 sp 0x7ffcfb207810
READ of size 1 at 0x61100079d8c0 thread T0
#0 0x513f5e in countprompt
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/prompt.c:1082
#1 0x7ff8e48e9ee4 in resetvideo
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_refresh.c:754
#2 0x7ff8e48f24b5 in zrefresh
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_refresh.c:1151
#3 0x7ff8e48d4e74 in zle_main_entry
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1994
#4 0x49856f in zleentry
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/init.c:1531
#5 0x51ee49 in zhandler
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/signals.c:654
#6 0x7ff8e7e6f44f (/lib64/libc.so.6+0x3344f)
#7 0x7ff8e7e6f785 in __sigsuspend (/lib64/libc.so.6+0x33785)
#8 0x51d7b5 in signal_suspend
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/signals.c:384
#9 0x4a47b8 in waitforpid
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/jobs.c:1401
#10 0x45f6f7 in getoutput
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/exec.c:4149
#11 0x52da9d in stringsubst
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/subst.c:324
#12 0x536ef8 in prefork
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/subst.c:85
#13 0x537e77 in singsub
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/subst.c:428
#14 0x51ad01 in promptexpand
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/prompt.c:187
#15 0x7ff8e48d0664 in reexpandprompt
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1870
#16 0x7ff8e48d07f8 in zle_resetprompt
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1895
#17 0x7ff8e48d4d24 in zle_main_entry
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1990
#18 0x49856f in zleentry
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/init.c:1531
#19 0x548a55 in adjustwinsize
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/utils.c:1933
#20 0x51ee49 in zhandler
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/signals.c:654
#21 0x7ff8e7e6f44f (/lib64/libc.so.6+0x3344f)
#22 0x7ff8e7f1829f in read (/lib64/libc.so.6+0xdc29f)
#23 0x7ff8e89765f6 in __interceptor_read
(/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libasan.so.1+0x2a5f6)
#24 0x7ff8e48cccf9 in read /usr/include/bits/unistd.h:44
#25 0x7ff8e48cccf9 in raw_getbyte
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:819
#26 0x7ff8e48cccf9 in getbyte
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:854
#27 0x7ff8e48cb086 in getkeybuf
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_keymap.c:1660
#28 0x7ff8e48cb086 in getkeymapcmd
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_keymap.c:1578
#29 0x7ff8e48cb66e in getkeycmd
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_keymap.c:1689
#30 0x7ff8e48cfc33 in zlecore
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1083
#31 0x7ff8e48d17cc in zleread
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1292
#32 0x49856f in zleentry
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/init.c:1531
#33 0x49bddd in inputline
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/input.c:293
#34 0x49bddd in ingetc
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/input.c:226
#35 0x488a88 in ihgetc
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/hist.c:391
#36 0x4b1790 in gettok
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/lex.c:611
#37 0x4b1790 in zshlex
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/lex.c:275
#38 0x4feba6 in parse_event
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/parse.c:570
#39 0x490a85 in loop
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/init.c:146
#40 0x4995f8 in zsh_main
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/init.c:1687
#41 0x7ff8e7e5c59f in __libc_start_main (/lib64/libc.so.6+0x2059f)
#42 0x412b18 in _start (/bin/zsh+0x412b18)
0x61100079d8c0 is located 0 bytes inside of 256-byte region
[0x61100079d8c0,0x61100079d9c0)
freed by thread T0 here:
#0 0x7ff8e89a355f in __interceptor_free
(/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libasan.so.1+0x5755f)
#1 0x7ff8e48d0625 in reexpandprompt
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/Zle/zle_main.c:1869
previously allocated by thread T0 here:
#0 0x7ff8e89a37d7 in malloc
(/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libasan.so.1+0x577d7)
#1 0x4c3c9e in zshcalloc
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/mem.c:974
#2 0xfff9f64152d (+0xdff0f64a52d)
SUMMARY: AddressSanitizer: heap-use-after-free
/usr/src/debug/app-shells/zsh-9999/zsh-9999/Src/prompt.c:1082
countprompt
Shadow bytes around the buggy address:
0x0c22800ebac0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c22800ebad0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c22800ebae0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x0c22800ebaf0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c22800ebb00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c22800ebb10: fa fa fa fa fa fa fa fa[fd]fd fd fd fd fd fd fd
0x0c22800ebb20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c22800ebb30: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x0c22800ebb40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c22800ebb50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c22800ebb60: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Contiguous container OOB:fc
ASan internal: fe
==26994==ABORTING
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