mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
471 lines
12 KiB
C
471 lines
12 KiB
C
/*
|
|
* linux/fs/binfmt_aout.c
|
|
*
|
|
* Copyright (C) 1991, 1992, 1996 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/a.out.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/binfmts.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/init.h>
|
|
#include <linux/coredump.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/a.out-core.h>
|
|
|
|
static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
|
|
static int load_aout_library(struct file*);
|
|
static int aout_core_dump(struct coredump_params *cprm);
|
|
|
|
static struct linux_binfmt aout_format = {
|
|
.module = THIS_MODULE,
|
|
.load_binary = load_aout_binary,
|
|
.load_shlib = load_aout_library,
|
|
.core_dump = aout_core_dump,
|
|
.min_coredump = PAGE_SIZE
|
|
};
|
|
|
|
#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
|
|
|
|
static int set_brk(unsigned long start, unsigned long end)
|
|
{
|
|
start = PAGE_ALIGN(start);
|
|
end = PAGE_ALIGN(end);
|
|
if (end > start) {
|
|
unsigned long addr;
|
|
down_write(¤t->mm->mmap_sem);
|
|
addr = do_brk(start, end - start);
|
|
up_write(¤t->mm->mmap_sem);
|
|
if (BAD_ADDR(addr))
|
|
return addr;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Routine writes a core dump image in the current directory.
|
|
* Currently only a stub-function.
|
|
*
|
|
* Note that setuid/setgid files won't make a core-dump if the uid/gid
|
|
* changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
|
|
* field, which also makes sure the core-dumps won't be recursive if the
|
|
* dumping of the process results in another error..
|
|
*/
|
|
|
|
static int aout_core_dump(struct coredump_params *cprm)
|
|
{
|
|
struct file *file = cprm->file;
|
|
mm_segment_t fs;
|
|
int has_dumped = 0;
|
|
void __user *dump_start;
|
|
int dump_size;
|
|
struct user dump;
|
|
#ifdef __alpha__
|
|
# define START_DATA(u) ((void __user *)u.start_data)
|
|
#else
|
|
# define START_DATA(u) ((void __user *)((u.u_tsize << PAGE_SHIFT) + \
|
|
u.start_code))
|
|
#endif
|
|
# define START_STACK(u) ((void __user *)u.start_stack)
|
|
|
|
fs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
has_dumped = 1;
|
|
current->flags |= PF_DUMPCORE;
|
|
strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
|
|
dump.u_ar0 = offsetof(struct user, regs);
|
|
dump.signal = cprm->signr;
|
|
aout_dump_thread(cprm->regs, &dump);
|
|
|
|
/* If the size of the dump file exceeds the rlimit, then see what would happen
|
|
if we wrote the stack, but not the data area. */
|
|
if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > cprm->limit)
|
|
dump.u_dsize = 0;
|
|
|
|
/* Make sure we have enough room to write the stack and data areas. */
|
|
if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
|
|
dump.u_ssize = 0;
|
|
|
|
/* make sure we actually have a data and stack area to dump */
|
|
set_fs(USER_DS);
|
|
if (!access_ok(VERIFY_READ, START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
|
|
dump.u_dsize = 0;
|
|
if (!access_ok(VERIFY_READ, START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
|
|
dump.u_ssize = 0;
|
|
|
|
set_fs(KERNEL_DS);
|
|
/* struct user */
|
|
if (!dump_write(file, &dump, sizeof(dump)))
|
|
goto end_coredump;
|
|
/* Now dump all of the user data. Include malloced stuff as well */
|
|
if (!dump_seek(cprm->file, PAGE_SIZE - sizeof(dump)))
|
|
goto end_coredump;
|
|
/* now we start writing out the user space info */
|
|
set_fs(USER_DS);
|
|
/* Dump the data area */
|
|
if (dump.u_dsize != 0) {
|
|
dump_start = START_DATA(dump);
|
|
dump_size = dump.u_dsize << PAGE_SHIFT;
|
|
if (!dump_write(file, dump_start, dump_size))
|
|
goto end_coredump;
|
|
}
|
|
/* Now prepare to dump the stack area */
|
|
if (dump.u_ssize != 0) {
|
|
dump_start = START_STACK(dump);
|
|
dump_size = dump.u_ssize << PAGE_SHIFT;
|
|
if (!dump_write(file, dump_start, dump_size))
|
|
goto end_coredump;
|
|
}
|
|
/* Finally dump the task struct. Not be used by gdb, but could be useful */
|
|
set_fs(KERNEL_DS);
|
|
if (!dump_write(file, current, sizeof(*current)))
|
|
goto end_coredump;
|
|
end_coredump:
|
|
set_fs(fs);
|
|
return has_dumped;
|
|
}
|
|
|
|
/*
|
|
* create_aout_tables() parses the env- and arg-strings in new user
|
|
* memory and creates the pointer tables from them, and puts their
|
|
* addresses on the "stack", returning the new stack pointer value.
|
|
*/
|
|
static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
|
|
{
|
|
char __user * __user *argv;
|
|
char __user * __user *envp;
|
|
unsigned long __user *sp;
|
|
int argc = bprm->argc;
|
|
int envc = bprm->envc;
|
|
|
|
sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
|
|
#ifdef __alpha__
|
|
/* whee.. test-programs are so much fun. */
|
|
put_user(0, --sp);
|
|
put_user(0, --sp);
|
|
if (bprm->loader) {
|
|
put_user(0, --sp);
|
|
put_user(1003, --sp);
|
|
put_user(bprm->loader, --sp);
|
|
put_user(1002, --sp);
|
|
}
|
|
put_user(bprm->exec, --sp);
|
|
put_user(1001, --sp);
|
|
#endif
|
|
sp -= envc+1;
|
|
envp = (char __user * __user *) sp;
|
|
sp -= argc+1;
|
|
argv = (char __user * __user *) sp;
|
|
#ifndef __alpha__
|
|
put_user((unsigned long) envp,--sp);
|
|
put_user((unsigned long) argv,--sp);
|
|
#endif
|
|
put_user(argc,--sp);
|
|
current->mm->arg_start = (unsigned long) p;
|
|
while (argc-->0) {
|
|
char c;
|
|
put_user(p,argv++);
|
|
do {
|
|
get_user(c,p++);
|
|
} while (c);
|
|
}
|
|
put_user(NULL,argv);
|
|
current->mm->arg_end = current->mm->env_start = (unsigned long) p;
|
|
while (envc-->0) {
|
|
char c;
|
|
put_user(p,envp++);
|
|
do {
|
|
get_user(c,p++);
|
|
} while (c);
|
|
}
|
|
put_user(NULL,envp);
|
|
current->mm->env_end = (unsigned long) p;
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* These are the functions used to load a.out style executables and shared
|
|
* libraries. There is no binary dependent code anywhere else.
|
|
*/
|
|
|
|
static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
|
|
{
|
|
struct exec ex;
|
|
unsigned long error;
|
|
unsigned long fd_offset;
|
|
unsigned long rlim;
|
|
int retval;
|
|
|
|
ex = *((struct exec *) bprm->buf); /* exec-header */
|
|
if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
|
|
N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
|
|
N_TRSIZE(ex) || N_DRSIZE(ex) ||
|
|
i_size_read(bprm->file->f_path.dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
/*
|
|
* Requires a mmap handler. This prevents people from using a.out
|
|
* as part of an exploit attack against /proc-related vulnerabilities.
|
|
*/
|
|
if (!bprm->file->f_op || !bprm->file->f_op->mmap)
|
|
return -ENOEXEC;
|
|
|
|
fd_offset = N_TXTOFF(ex);
|
|
|
|
/* Check initial limits. This avoids letting people circumvent
|
|
* size limits imposed on them by creating programs with large
|
|
* arrays in the data or bss.
|
|
*/
|
|
rlim = rlimit(RLIMIT_DATA);
|
|
if (rlim >= RLIM_INFINITY)
|
|
rlim = ~0;
|
|
if (ex.a_data + ex.a_bss > rlim)
|
|
return -ENOMEM;
|
|
|
|
/* Flush all traces of the currently running executable */
|
|
retval = flush_old_exec(bprm);
|
|
if (retval)
|
|
return retval;
|
|
|
|
/* OK, This is the point of no return */
|
|
#ifdef __alpha__
|
|
SET_AOUT_PERSONALITY(bprm, ex);
|
|
#else
|
|
set_personality(PER_LINUX);
|
|
#endif
|
|
setup_new_exec(bprm);
|
|
|
|
current->mm->end_code = ex.a_text +
|
|
(current->mm->start_code = N_TXTADDR(ex));
|
|
current->mm->end_data = ex.a_data +
|
|
(current->mm->start_data = N_DATADDR(ex));
|
|
current->mm->brk = ex.a_bss +
|
|
(current->mm->start_brk = N_BSSADDR(ex));
|
|
current->mm->free_area_cache = current->mm->mmap_base;
|
|
current->mm->cached_hole_size = 0;
|
|
|
|
install_exec_creds(bprm);
|
|
current->flags &= ~PF_FORKNOEXEC;
|
|
|
|
if (N_MAGIC(ex) == OMAGIC) {
|
|
unsigned long text_addr, map_size;
|
|
loff_t pos;
|
|
|
|
text_addr = N_TXTADDR(ex);
|
|
|
|
#ifdef __alpha__
|
|
pos = fd_offset;
|
|
map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
|
|
#else
|
|
pos = 32;
|
|
map_size = ex.a_text+ex.a_data;
|
|
#endif
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_brk(text_addr & PAGE_MASK, map_size);
|
|
up_write(¤t->mm->mmap_sem);
|
|
if (error != (text_addr & PAGE_MASK)) {
|
|
send_sig(SIGKILL, current, 0);
|
|
return error;
|
|
}
|
|
|
|
error = bprm->file->f_op->read(bprm->file,
|
|
(char __user *)text_addr,
|
|
ex.a_text+ex.a_data, &pos);
|
|
if ((signed long)error < 0) {
|
|
send_sig(SIGKILL, current, 0);
|
|
return error;
|
|
}
|
|
|
|
flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
|
|
} else {
|
|
if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
|
|
(N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
|
|
{
|
|
printk(KERN_NOTICE "executable not page aligned\n");
|
|
}
|
|
|
|
if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit())
|
|
{
|
|
printk(KERN_WARNING
|
|
"fd_offset is not page aligned. Please convert program: %s\n",
|
|
bprm->file->f_path.dentry->d_name.name);
|
|
}
|
|
|
|
if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
|
|
loff_t pos = fd_offset;
|
|
down_write(¤t->mm->mmap_sem);
|
|
do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
|
|
up_write(¤t->mm->mmap_sem);
|
|
bprm->file->f_op->read(bprm->file,
|
|
(char __user *)N_TXTADDR(ex),
|
|
ex.a_text+ex.a_data, &pos);
|
|
flush_icache_range((unsigned long) N_TXTADDR(ex),
|
|
(unsigned long) N_TXTADDR(ex) +
|
|
ex.a_text+ex.a_data);
|
|
goto beyond_if;
|
|
}
|
|
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
|
|
PROT_READ | PROT_EXEC,
|
|
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
|
|
fd_offset);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
if (error != N_TXTADDR(ex)) {
|
|
send_sig(SIGKILL, current, 0);
|
|
return error;
|
|
}
|
|
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
|
|
fd_offset + ex.a_text);
|
|
up_write(¤t->mm->mmap_sem);
|
|
if (error != N_DATADDR(ex)) {
|
|
send_sig(SIGKILL, current, 0);
|
|
return error;
|
|
}
|
|
}
|
|
beyond_if:
|
|
set_binfmt(&aout_format);
|
|
|
|
retval = set_brk(current->mm->start_brk, current->mm->brk);
|
|
if (retval < 0) {
|
|
send_sig(SIGKILL, current, 0);
|
|
return retval;
|
|
}
|
|
|
|
retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
|
|
if (retval < 0) {
|
|
/* Someone check-me: is this error path enough? */
|
|
send_sig(SIGKILL, current, 0);
|
|
return retval;
|
|
}
|
|
|
|
current->mm->start_stack =
|
|
(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
|
|
#ifdef __alpha__
|
|
regs->gp = ex.a_gpvalue;
|
|
#endif
|
|
start_thread(regs, ex.a_entry, current->mm->start_stack);
|
|
return 0;
|
|
}
|
|
|
|
static int load_aout_library(struct file *file)
|
|
{
|
|
struct inode * inode;
|
|
unsigned long bss, start_addr, len;
|
|
unsigned long error;
|
|
int retval;
|
|
struct exec ex;
|
|
|
|
inode = file->f_path.dentry->d_inode;
|
|
|
|
retval = -ENOEXEC;
|
|
error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
|
|
if (error != sizeof(ex))
|
|
goto out;
|
|
|
|
/* We come in here for the regular a.out style of shared libraries */
|
|
if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
|
|
N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
|
|
i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Requires a mmap handler. This prevents people from using a.out
|
|
* as part of an exploit attack against /proc-related vulnerabilities.
|
|
*/
|
|
if (!file->f_op || !file->f_op->mmap)
|
|
goto out;
|
|
|
|
if (N_FLAGS(ex))
|
|
goto out;
|
|
|
|
/* For QMAGIC, the starting address is 0x20 into the page. We mask
|
|
this off to get the starting address for the page */
|
|
|
|
start_addr = ex.a_entry & 0xfffff000;
|
|
|
|
if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
|
|
loff_t pos = N_TXTOFF(ex);
|
|
|
|
if (printk_ratelimit())
|
|
{
|
|
printk(KERN_WARNING
|
|
"N_TXTOFF is not page aligned. Please convert library: %s\n",
|
|
file->f_path.dentry->d_name.name);
|
|
}
|
|
down_write(¤t->mm->mmap_sem);
|
|
do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
file->f_op->read(file, (char __user *)start_addr,
|
|
ex.a_text + ex.a_data, &pos);
|
|
flush_icache_range((unsigned long) start_addr,
|
|
(unsigned long) start_addr + ex.a_text + ex.a_data);
|
|
|
|
retval = 0;
|
|
goto out;
|
|
}
|
|
/* Now use mmap to map the library into memory. */
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
|
|
N_TXTOFF(ex));
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr)
|
|
goto out;
|
|
|
|
len = PAGE_ALIGN(ex.a_text + ex.a_data);
|
|
bss = ex.a_text + ex.a_data + ex.a_bss;
|
|
if (bss > len) {
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_brk(start_addr + len, bss - len);
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr + len)
|
|
goto out;
|
|
}
|
|
retval = 0;
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int __init init_aout_binfmt(void)
|
|
{
|
|
return register_binfmt(&aout_format);
|
|
}
|
|
|
|
static void __exit exit_aout_binfmt(void)
|
|
{
|
|
unregister_binfmt(&aout_format);
|
|
}
|
|
|
|
core_initcall(init_aout_binfmt);
|
|
module_exit(exit_aout_binfmt);
|
|
MODULE_LICENSE("GPL");
|