It's not obvious to me why the kernel would hang with an invalid pointer
error message there: ipc_lock appears to have good safety against being
passed a random id. Perhaps the invalid pointer message comes from
other code you've not shown (for example, I hope you shm_unlock(shp)
and return 1 when shm_lock succeeds), or perhaps I'm misreading.
I have put printk() statements all over the place. The hang (which is during
boot time) occurs within the block of code that I sent you. There is a
shm_unlock() statement after the code, but it is never reached.
Since you're already patching base kernel source (you mention
arch/xyz/mm/fault.c), why don't you just patch your own VM_SYSVSHM
into include/linux/mm.h, and set it on the vma in ipc/shm.c?
Yes this looks like a good solution. I have changed VM_SHM in mm.h to be
0x0800000 and am looking for a good place to include it in the
vma->vm_flags. shmat() looks like a good place. How can I find the vma of a
SysV shm in that routine?
-Kamran
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