* [PATCH -mm 1/2] ELF: make BAD_ADDR() unlikely
@ 2019-12-15 12:43 Alexey Dobriyan
0 siblings, 0 replies; only message in thread
From: Alexey Dobriyan @ 2019-12-15 12:43 UTC (permalink / raw)
To: akpm; +Cc: linux-kernel
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.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
fs/binfmt_elf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/binfmt_elf.c
+++ b/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)
{
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2019-12-15 12:43 [PATCH -mm 1/2] ELF: make BAD_ADDR() unlikely Alexey Dobriyan
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