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2025 at 05:17:15PM +0200, Oleg Nesterov wrote: > On 05/27, Lorenzo Stoakes wrote: > > > > I am by the way assuming that uprobes work by installing a special PTE at > > page offset 0 and only in the case where there is something installed here > > do we need to worry. > > perhaps I misunderstood you but no... > > Basically, we have uprobe_register(struct inode *inode, loff_t offset, ...). > If / when a process mmaps this inode/file and the (new) VMA includes this offset, > we need to call uprobe_mmap() to install the breakpoint at the virtual address > which corresponds to this offset. OK this was based on the explanation given re: zero offset. So presumably then this is determined by the perf_event_attr.probe_offset field? OK well we can drop the vm_pgoff predicate and things should still work because, after the move: A B |-----------------------||--------------------------| | VMA to be merged with || VMA being moved in place | |-----------------------||--------------------------| If A contains the relevant breakpoint(s), then they will stay in place, as move_page_tables() won't overwrite them. If B contains them, then the new mechanism that prevents uprobe_mmap() from installing a new one (orphaning the old) will make everything right. So we simply take my approach, and drop the vm_pgoff condition and everything should work fine :) Obviously let me know if you see any flaw in this. > > Oleg. > Cheers, Lorenzo