bugGNU GRUB - Bugs: bug #51188, FPE (division by zero) in...


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bug #51188: FPE (division by zero) in grub_ext2_read_inode()

Submitted by:  Kamil Frankowicz <fumfel>
Submitted on:  Tue 06 Jun 2017 11:00:13 AM UTC  
Category:  Filesystem Severity:  Major
Priority:  5 - Normal Item Group:  Software Error
Status:  Invalid Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Closed Release: 
Release:  other Reproducibility:  Every Time
Planned Release:  None

Tue 06 Jun 2017 06:00:21 PM UTC, comment #1: 

Thank you for report. Unfortunately, your project is using very old grub sources; the code in question does not exist in current git.

Andrei Borzenkov <arvidjaar>
Project Member
Tue 06 Jun 2017 11:00:13 AM UTC, original submission:  

While fuzzing radare2 I found FPE in function grub_ext2_read_inode()

Original issue with repro: https://github.com/radare/radare2/issues/7650

ASAN from r2:

==10375==ERROR: AddressSanitizer: FPE on unknown address 0x7fb2f4af4726 (pc 0x7fb2f4af4726 bp 0x7fff41d52850 sp 0x7fff41d52720 T0)
    #0 0x7fb2f4af4725 in grub_ext2_read_inode XYZ/radare2/shlr/grub/fs/ext2.c:525:29
    #1 0x7fb2f4af2ce4 in grub_ext2_mount XYZ/radare2/shlr/grub/fs/ext2.c:593:3
    #2 0x7fb2f4af19ac in grub_ext2_dir XYZ/radare2/shlr/grub/fs/ext2.c:863:10
    #3 0x7fb2f4ad2c58 in ext2__mount XYZ/radare2/libr/fs/p/fs_grub_base.c:74:8
    #4 0x7fb2f4addeaa in r_fs_mount XYZ/radare2/libr/fs/fs.c:151:7
    #5 0x7fb2f7ef996b in cmd_mount XYZ/radare2/libr/core/./cmd_mount.c:49:9
    #6 0x7fb2f80be7df in r_cmd_call XYZ/radare2/libr/core/cmd_api.c:226:10
    #7 0x7fb2f7faddeb in r_core_cmd_subst_i XYZ/radare2/libr/core/cmd.c:2178:12
    #8 0x7fb2f7ef6127 in r_core_cmd_subst XYZ/radare2/libr/core/cmd.c:1368:9
    #9 0x7fb2f7eef8b9 in r_core_cmd XYZ/radare2/libr/core/cmd.c:2786:9
    #10 0x7fb2f7eda74f in r_core_cmdf XYZ/radare2/libr/core/cmd.c:2942:8
    #11 0x7fb2f8098e42 in bin_info XYZ/radare2/libr/core/cbin.c:621:4
    #12 0x7fb2f8098e42 in r_core_bin_info XYZ/radare2/libr/core/cbin.c:2870
    #13 0x7fb2f8089531 in r_core_bin_set_env XYZ/radare2/libr/core/cbin.c:115:3
    #14 0x7fb2f8015064 in r_core_file_do_load_for_io_plugin XYZ/radare2/libr/core/file.c:434:2
    #15 0x7fb2f8015064 in r_core_bin_load XYZ/radare2/libr/core/file.c:567
    #16 0x55e7cf695f6b in main XYZ/radare2/binr/radare2/radare2.c:952:14
    #17 0x7fb2f0bae82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #18 0x55e7cf5c5f38 in _start (/usr/local/bin/radare2+0x20f38)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE XYZ/radare2/shlr/grub/fs/ext2.c:525:29 in grub_ext2_read_inode

Kamil Frankowicz <fumfel>


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Items that depend on this one: None found


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-06-06 arvidjaar StatusNone => Invalid
        Open/ClosedOpen => Closed

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