mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
84929801e1
Appended patch will setup compatibility mode TASK_SIZE properly. This will fix atleast three known bugs that can be encountered while running compatibility mode apps. a) A malicious 32bit app can have an elf section at 0xffffe000. During exec of this app, we will have a memory leak as insert_vm_struct() is not checking for return value in syscall32_setup_pages() and thus not freeing the vma allocated for the vsyscall page. And instead of exec failing (as it has addresses > TASK_SIZE), we were allowing it to succeed previously. b) With a 32bit app, hugetlb_get_unmapped_area/arch_get_unmapped_area may return addresses beyond 32bits, ultimately causing corruption because of wrap-around and resulting in SEGFAULT, instead of returning ENOMEM. c) 32bit app doing this below mmap will now fail. mmap((void *)(0xFFFFE000UL), 0x10000UL, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE|MAP_ANON, 0, 0); Signed-off-by: Zou Nan hai <nanhai.zou@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
28 lines
813 B
C
28 lines
813 B
C
#ifndef __X8664_A_OUT_H__
|
|
#define __X8664_A_OUT_H__
|
|
|
|
/* 32bit a.out */
|
|
|
|
struct exec
|
|
{
|
|
unsigned int a_info; /* Use macros N_MAGIC, etc for access */
|
|
unsigned a_text; /* length of text, in bytes */
|
|
unsigned a_data; /* length of data, in bytes */
|
|
unsigned a_bss; /* length of uninitialized data area for file, in bytes */
|
|
unsigned a_syms; /* length of symbol table data in file, in bytes */
|
|
unsigned a_entry; /* start address */
|
|
unsigned a_trsize; /* length of relocation info for text, in bytes */
|
|
unsigned a_drsize; /* length of relocation info for data, in bytes */
|
|
};
|
|
|
|
#define N_TRSIZE(a) ((a).a_trsize)
|
|
#define N_DRSIZE(a) ((a).a_drsize)
|
|
#define N_SYMSIZE(a) ((a).a_syms)
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/thread_info.h>
|
|
#define STACK_TOP TASK_SIZE
|
|
#endif
|
|
|
|
#endif /* __A_OUT_GNU_H__ */
|