URL:
<http://savannah.gnu.org/bugs/?51188>
Summary: FPE (division by zero) in grub_ext2_read_inode()
Project: GNU GRUB
Submitted by: fumfel
Submitted on: Tue 06 Jun 2017 11:00:13 AM UTC
Category: Filesystem
Severity: Major
Priority: 5 - Normal
Item Group: Software Error
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release:
Release: other
Reproducibility: Every Time
Planned Release: None
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Details:
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
==10375==ABORTING
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