On Tue, Oct 30, 2018 at 03:32:40PM +0000, Alexander Richardson wrote: > On Tue, 30 Oct 2018 at 10:17, Michael Tuexen > <michael.tue...@macmic.franken.de> wrote: > > > > > On 29. Oct 2018, at 22:08, Alex Richardson <arichard...@freebsd.org> > > > wrote: > > > > > > Author: arichardson > > > Date: Mon Oct 29 21:08:02 2018 > > > New Revision: 339876 > > > URL: https://svnweb.freebsd.org/changeset/base/339876 > > > > > > Log: > > > rtld: set obj->textsize correctly > > > > > > With lld-generated binaries the first PT_LOAD will usually be a read-only > > > segment unless you pass --no-rosegment. For those binaries the textsize > > > is > > > determined by the next PT_LOAD. To allow both LLD and bfd 2.17 binaries > > > to > > > be parsed correctly use the end of the last PT_LOAD that is marked as > > > executable instead. > > > > > > I noticed that the value was wrong while adding some debug prints for > > > some rtld > > > changes for CHERI binaries. `obj->textsize` only seems to be used by PPC > > > so the > > > effect is untested. However, the value before was definitely wrong and > > > the new > > > result matches the phdrs. > > I build kernel and world with a revision later than this on a PPC. Buildword > > ends up with a world where almost all binaries are segfaulting.... > > Especially gdb > > (but svn, ls or so all segfault). > > > > Best regards > > Michael > > This is rather surprising since if anything the range of the icache > flush should increase rather than decrease after this change. > > I can only see this causing a behaviour change if we actually need to > flush more than just the executable segments. > Is it possible that some binary/library contains a non-executable > segment as the first PT_LOAD? > Or is there some linker script that adds custom PHDRS? > Could it be that there is a hole between start of the object mapping and the last PT_LOADable segment eligible for execution ?
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