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binfmt_elf fix for v5.17-rc7

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- Fix ia64 ET_EXEC loading
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Merge tag 'binfmt_elf-v5.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull binfmt_elf fix from Kees Cook:
 "This addresses a regression[1] under ia64 where some ET_EXEC binaries
  were not loading"

Link: https://linux-regtracking.leemhuis.info/regzbot/regression/a3edd529-c42d-3b09-135c-7e98a15b150f@leemhuis.info/ [1]

- Fix ia64 ET_EXEC loading

* tag 'binfmt_elf-v5.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  binfmt_elf: Avoid total_mapping_size for ET_EXEC
This commit is contained in:
Linus Torvalds 2022-03-01 11:31:37 -08:00
commit 5751153606
1 changed files with 18 additions and 7 deletions
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25
fs/binfmt_elf.c
View file

@ -1135,14 +1135,25 @@ static int load_elf_binary(struct linux_binprm *bprm)
* is then page aligned.
*/
load_bias = ELF_PAGESTART(load_bias - vaddr);
}
/*
* Calculate the entire size of the ELF mapping (total_size).
* (Note that load_addr_set is set to true later once the
* initial mapping is performed.)
*/
if (!load_addr_set) {
/*
* Calculate the entire size of the ELF mapping
* (total_size), used for the initial mapping,
* due to load_addr_set which is set to true later
* once the initial mapping is performed.
*
* Note that this is only sensible when the LOAD
* segments are contiguous (or overlapping). If
* used for LOADs that are far apart, this would
* cause the holes between LOADs to be mapped,
* running the risk of having the mapping fail,
* as it would be larger than the ELF file itself.
*
* As a result, only ET_DYN does this, since
* some ET_EXEC (e.g. ia64) may have large virtual
* memory holes between LOADs.
*
*/
total_size = total_mapping_size(elf_phdata,
elf_ex->e_phnum);
if (!total_size) {