crash on /sbin/init with busybox.nommu (on alpine:latest image)

thehajime / linux

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crash on /sbin/init with busybox.nommu (on alpine:latest image) #8

Closed thehajime closed 1 day ago

thehajime commented 1 week ago

=> init=/etc/init.d/rcS sh works fine
=> P1) -fno-stack-protector needed (should not be relying on...) #19
=> P2) 1.32.1 works while 1.33.0 doesn't (mas_start endless loop?)
=> -malign=abi is introduced in 1.33.0 (but not related)

bisecting now

thehajime commented 1 day ago

a crash is triggered by an execution on RW memory; when #22 is happened (endless loop on init=>hush=>source /etc/profile), memory becomes exhausted and run out of resource, then it accesses the area which isn't a part of physmem. And it has no exec bit on on this area (as MMU case set on with the other part), it will cause a segmentation violation.

The following commit fixes this issue. https://github.com/thehajime/linux/commit/f41ba0a1f5632ba10891b2c3eaf2efa000ddf6be