From 133578ac70a26b5ee31b308a740cb0362bb3b032 Mon Sep 17 00:00:00 2001
From: Chen Jingwen <chenjingwen6@huawei.com>
Date: Tue, 28 Sep 2021 20:56:57 +0800
Subject: [PATCH] elf: don't use MAP_FIXED_NOREPLACE for elf interpreter mappings
Git-commit: 9b2f72cc0aa4bb444541bb87581c35b7508b37d3
Patch-mainline: v5.15-rc4
References: stable-5.14.10
commit 9b2f72cc0aa4bb444541bb87581c35b7508b37d3 upstream.
In commit b212921b13bd ("elf: don't use MAP_FIXED_NOREPLACE for elf
executable mappings") we still leave MAP_FIXED_NOREPLACE in place for
load_elf_interp.
Unfortunately, this will cause kernel to fail to start with:
1 (init): Uhuuh, elf segment at 00003ffff7ffd000 requested but the memory is mapped already
Failed to execute /init (error -17)
The reason is that the elf interpreter (ld.so) has overlapping segments.
readelf -l ld-2.31.so
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x000000000002c94c 0x000000000002c94c R E 0x10000
LOAD 0x000000000002dae0 0x000000000003dae0 0x000000000003dae0
0x00000000000021e8 0x0000000000002320 RW 0x10000
LOAD 0x000000000002fe00 0x000000000003fe00 0x000000000003fe00
0x00000000000011ac 0x0000000000001328 RW 0x10000
The reason for this problem is the same as described in commit
ad55eac74f20 ("elf: enforce MAP_FIXED on overlaying elf segments").
Not only executable binaries, elf interpreters (e.g. ld.so) can have
overlapping elf segments, so we better drop MAP_FIXED_NOREPLACE and go
back to MAP_FIXED in load_elf_interp.
Fixes: 4ed28639519c ("fs, elf: drop MAP_FIXED usage from elf_map")
Cc: <stable@vger.kernel.org> # v4.19
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Chen Jingwen <chenjingwen6@huawei.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
fs/binfmt_elf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 439ed81e755a..964be729ed0a 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -630,7 +630,7 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
vaddr = eppnt->p_vaddr;
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
- elf_type |= MAP_FIXED_NOREPLACE;
+ elf_type |= MAP_FIXED;
else if (no_base && interp_elf_ex->e_type == ET_DYN)
load_addr = -vaddr;
--
2.26.2