Messages in this thread | | | From | "H.J. Lu" <> | Date | Sun, 12 Dec 2021 11:05:52 -0800 | Subject | Re: [PATCH] fs/binfmt_elf.c: disallow zero entry point address |
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On Sun, Dec 12, 2021 at 10:29 AM Linus Torvalds <torvalds@linux-foundation.org> wrote: > > On Sun, Dec 12, 2021 at 5:52 AM H.J. Lu <hjl.tools@gmail.com> wrote: > > > > On Sat, Dec 11, 2021 at 11:38 PM Alexey Dobriyan <adobriyan@gmail.com> wrote: > > > > > > Why not let it segfault? > > > > Why let it segfault? > > That's not my main worry - what if somebody has a code section with a > zero vaddr and intentionally put the entry at the beginning? > > Maybe it's not supposed to work by some paper standatd, but afaik > currently it _would_ work. > > All these things are relative to the load address, so a zero e_entry > doesn't mean NULL, and may be a perfectly valid address. > > No?
According to the ELF specification, zero entry point value means there is no entry point. Such ELF binary doesn't conform to the ELF specification.
-- H.J.
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