Messages in this thread | | | Date | Thu, 5 Oct 2017 18:42:48 +0200 | From | Michal Hocko <> | Subject | Re: MAP_FIXED for ELF mappings |
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On Thu 05-10-17 18:33:20, Oleg Nesterov wrote: > On 10/04, Michal Hocko wrote: > > > > On Wed 04-10-17 23:12:38, Baoquan He wrote: > > > if (total_size) { > > > total_size = ELF_PAGEALIGN(total_size); > > > - map_addr = vm_mmap(filep, addr, total_size, prot, flags, off); > > > - if (!BAD_ADDR(map_addr)) > > > - vm_munmap(map_addr+size, total_size-size); > > > - } else > > > - map_addr = vm_mmap(filep, addr, size, prot, flags, off); > > > + addr = get_unmapped_area(file, addr, total_size, off, flags); > > > > So how does this prevent clobbering an existing VMA when flags contains > > MAP_FIXED? > > I got lost... > > this is just cleanup, it should not change the behaviour, with or without > MAP_FIXED. It just avoids the mmap(total_size) + munmap(extra_size).
OK, I have clearly misunderstood the intention then. -- Michal Hocko SUSE Labs
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