]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
fs/binfmt_elf: fix PT_LOAD p_align values for loaders
authorMike Rapoport <rppt@linux.ibm.com>
Sat, 12 Feb 2022 00:32:22 +0000 (16:32 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 12 Feb 2022 01:55:00 +0000 (17:55 -0800)
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 9630f0d60fec ("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/20220202121433.3697146-1-rppt@kernel.org
Fixes: 9630f0d60fec ("fs/binfmt_elf: use PT_LOAD p_align values for static PIE")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reported-by: Rui Salvaterra <rsalvaterra@gmail.com>
Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/binfmt_elf.c

index 605017eb9349e5e9de8b60ff38118eb0428c11dc..9e11e6f13e83affc3bedb4850a362e59a303a676 100644 (file)
@@ -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();