The patch titled
Subject: fs/binfmt_elf.c: make BAD_ADDR() unlikely
has been added to the -mm tree. Its filename is
elf-make-bad_addr-unlikely.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/elf-make-bad_addr-unlikely.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/elf-make-bad_addr-unlikely.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: fs/binfmt_elf.c: make BAD_ADDR() unlikely
If some mapping goes past TASK_SIZE it will be rejected by kernel which
means no such userspace binaries exist.
Mark every such check as unlikely.
Link: http://lkml.kernel.org/r/20191215124355.GA21124@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/binfmt_elf.c~elf-make-bad_addr-unlikely
+++ a/fs/binfmt_elf.c
@@ -97,7 +97,7 @@ static struct linux_binfmt elf_format =
.min_coredump = ELF_EXEC_PAGESIZE,
};
-#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
+#define BAD_ADDR(x) (unlikely((unsigned long)(x) >= TASK_SIZE))
static int set_brk(unsigned long start, unsigned long end, int prot)
{
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
ramfs-support-o_tmpfile.patch
elf-smaller-code-generation-around-auxv-vector-fill.patch
elf-fix-start_code-calculation.patch
elf-dont-copy-elf-header-around.patch
elf-better-codegen-around-current-mm.patch
elf-make-bad_addr-unlikely.patch
execve-warn-if-process-starts-with-executable-stack.patch
