linux-kernel - [PATCH 5.17 181/219] revert "fs/binfmt_elf: use PT_LOAD p

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Date:   Mon, 18 Apr 2022 14:12:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Chris Kennelly <ckennelly@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Hugh Dickins <hughd@...gle.com>,
        Ian Rogers <irogers@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.17 181/219] revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"

From: Andrew Morton <akpm@...ux-foundation.org>

commit aeb7923733d100b86c6bc68e7ae32913b0cec9d8 upstream.

Despite Mike's attempted fix (925346c129da117122), regressions reports
continue:

  https://lore.kernel.org/lkml/cb5b81bd-9882-e5dc-cd22-54bdbaaefbbc@leemhuis.info/
  https://bugzilla.kernel.org/show_bug.cgi?id=215720
  https://lkml.kernel.org/r/b685f3d0-da34-531d-1aa9-479accd3e21b@leemhuis.info

So revert this patch.

Fixes: 9630f0d60fec ("fs/binfmt_elf: use PT_LOAD p_align values for static PIE")
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Chris Kennelly <ckennelly@...gle.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Fangrui Song <maskray@...gle.com>
Cc: H.J. Lu <hjl.tools@...il.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Ian Rogers <irogers@...gle.com>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Sandeep Patil <sspatil@...gle.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Song Liu <songliubraving@...com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Thorsten Leemhuis <regressions@...mhuis.info>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/binfmt_elf.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1116,11 +1116,11 @@ out_free_interp:
 			 * independently randomized mmap region (0 load_bias
 			 * without MAP_FIXED nor MAP_FIXED_NOREPLACE).
 			 */
-			alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
-			if (alignment > ELF_MIN_ALIGN) {
+			if (interpreter) {
 				load_bias = ELF_ET_DYN_BASE;
 				if (current->flags & PF_RANDOMIZE)
 					load_bias += arch_mmap_rnd();
+				alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
 				if (alignment)
 					load_bias &= ~(alignment - 1);
 				elf_flags |= MAP_FIXED_NOREPLACE;