https://bugzilla.kernel.org/show_bug.cgi?id=194695 Bug ID: 194695 Summary: size overflow detected in function ext4_mb_new_group_pa Product: File System Version: 2.5 Kernel Version: 4.9.10-1+grsec201702162016+1 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: fs_ext4@xxxxxxxxxxxxxxxxxxxx Reporter: matthijs@xxxxxxxxxxxx Regression: No I am trying to run a kernel with grsecurity with the size overflow protection and am getting the following warnings / errors: dmesg: http://pastebin.com/wr3UGLS9 config: http://pastebin.com/sr8M9bP0 mballoc.* (make fs/ext4/mballoc.o EXTRA_CFLAGS="-fdump-tree-all -fdump-ipa-all") http://filebin.ca/3DMIChVw9lQM/mballoc.tgz According to the grsecurity developers it seems to be a bug in ext4, see for some background here: https://forums.grsecurity.net/viewtopic.php?f=1&t=4678&p=16971 The response from ephox (PAX team / grsecurity developer): -- Thanks for the report. I think this is an upstream bug. Based on the runtime values provided by you, ext4_mb_new_group_pa() tries to store a value into pa->pa_lstart which larger than UINT_MAX which comes from ext4_group_first_block_no(). Could you please report it to the ext4 developers? -- I'll try to answer all the questions but I'm not an expert in this area. -- You are receiving this mail because: You are watching the assignee of the bug.
