| Summary: | SIGSEGV on pushfile | ||
|---|---|---|---|
| Product: | Busybox | Reporter: | Franco Costantini <franco.costantini20> |
| Component: | Other | Assignee: | unassigned |
| Status: | RESOLVED WONTFIX | ||
| Severity: | normal | CC: | busybox-cvs |
| Priority: | P5 | ||
| Version: | unspecified | ||
| Target Milestone: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Host: | Target: | ||
| Build: | |||
| Attachments: |
Test case
config file |
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Created attachment 6691 [details]
config file
Won't fix this: this is stack overflow (8mbytes of stack) |
Created attachment 6686 [details] Test case We recently found an invalid memory access parsing and executing fuzzed bash code in Busybox 1.25.0. We tested this issue on Ubuntu 14.04.5 (x86_64) but other configurations could be affected. Please find attached the full .config file. gdb backtrace is as follows: [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007ffff4e6040c in malloc () from /usr/lib/x86_64-linux-gnu/libasan.so.0 #0 0x00007ffff4e6040c in malloc () from /usr/lib/x86_64-linux-gnu/libasan.so.0 #1 0x000000000040a977 in xmalloc (size=size@entry=88) at libbb/xfuncs_printf.c:47 #2 0x000000000040a9c3 in xzalloc (size=size@entry=88) at libbb/xfuncs_printf.c:68 #3 0x00000000004aff4a in pushfile () at shell/ash.c:9927 #4 0x00000000004b15fb in setinputstring (string=0x60920000b910 "") at shell/ash.c:10032 #5 0x00000000004c2be0 in readtoken1 (c=<optimized out>, syntax=<optimized out>, syntax@entry=1, eofmark=eofmark@entry=0x60360000ffa0 "y", striptabs=striptabs@entry=0) at shell/ash.c:11710 #6 0x00000000004c12d7 in parseheredoc () at shell/ash.c:12038 #7 0x00000000004c13ef in list (nlflag=3, nlflag@entry=1) at shell/ash.c:10556 #8 0x00000000004c4738 in parsecmd (interact=<optimized out>) at shell/ash.c:12021 #9 0x00000000004c5cdb in cmdloop (top=top@entry=1) at shell/ash.c:12160 #10 0x00000000004cb1cb in ash_main (argc=<optimized out>, argv=0x7fffffffed60) at shell/ash.c:13255 #11 0x0000000000408951 in run_applet_no_and_exit (applet_no=applet_no@entry=271, argv=argv@entry=0x7fffffffed60) at libbb/appletlib.c:879 #12 0x0000000000408efc in run_applet_and_exit (name=name@entry=0x7fffffffef2e "sh", argv=argv@entry=0x7fffffffed60) at libbb/appletlib.c:893 #13 0x0000000000408ed6 in busybox_main (argv=0x7fffffffed60) at libbb/appletlib.c:840 #14 run_applet_and_exit (name=name@entry=0x7fffffffef1b "busybox_unstripped", argv=argv@entry=0x7fffffffed58) at libbb/appletlib.c:888 #15 0x0000000000408fcd in main (argc=<optimized out>, argv=0x7fffffffed58) at libbb/appletlib.c:971 This issue was found using QuickFuzz, the file to reproduce it is attached. Regards.