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fs/binfmt_elf: fix PT_LOAD p_align values for loaders

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Rui Salvaterra reported that Aisleroit solitaire crashes with "Wrong
__data_start/_end pair" assertion from libgc after update to v5.17-rc1.

Bisection pointed to commit 9630f0d60f ("fs/binfmt_elf: use PT_LOAD
p_align values for static PIE") that fixed handling of static PIEs, but
made the condition that guards load_bias calculation to exclude loader
binaries.

Restoring the check for presence of interpreter fixes the problem.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 9630f0d60f ("fs/binfmt_elf: use PT_LOAD p_align values for static PIE")
Signed-off-by: Mike Rapoport <[email protected]>
Reported-by: Rui Salvaterra <[email protected]>
Tested-by: Rui Salvaterra <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: "H.J. Lu" <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Rapoport authored and Linus Torvalds committed 2022-02-11 17:55:00 -08:00
1 parent f1baf68e13
commit 925346c129
1 file changed
+1 -1
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fs/binfmt_elf.c
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@@ -1117,7 +1117,7 @@ out_free_interp:
* without MAP_FIXED nor MAP_FIXED_NOREPLACE).
*/
alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
if (alignment > ELF_MIN_ALIGN) {
if (interpreter || alignment > ELF_MIN_ALIGN) {
load_bias = ELF_ET_DYN_BASE;
if (current->flags & PF_RANDOMIZE)
load_bias += arch_mmap_rnd();