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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu

Browse Source 
Pull m68nommu updates from Greg Ungerer:
 "A series of cleanups for the FLAT format binary loader, binfmt_flat,
  from Christoph.

  The end goal is to support no-MMU on RISC-V, and the last patch
  enables that"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
  riscv: add binfmt_flat support
  binfmt_flat: don't offset the data start
  binfmt_flat: move the MAX_SHARED_LIBS definition to binfmt_flat.c
  binfmt_flat: remove the persistent argument from flat_get_addr_from_rp
  binfmt_flat: provide an asm-generic/flat.h
  binfmt_flat: make support for old format binaries optional
  binfmt_flat: add a ARCH_HAS_BINFMT_FLAT option
  binfmt_flat: add endianess annotations
  binfmt_flat: use fixed size type for the on-disk format
  binfmt_flat: consolidate two version of flat_v2_reloc_t
  binfmt_flat: remove the unused OLD_FLAT_FLAG_RAM definition
  binfmt_flat: remove the uapi <linux/flat.h> header
  binfmt_flat: replace flat_argvp_envp_on_stack with a Kconfig variable
  binfmt_flat: remove flat_old_ram_flag
  binfmt_flat: provide a default version of flat_get_relocate_addr
  binfmt_flat: remove flat_set_persistent
  binfmt_flat: remove flat_reloc_valid
This commit is contained in:
Linus Torvalds
2019-07-10 21:42:03 -07:00
parent d2b6b4c832 ad97f9df0f
commit 398364a35d
21 changed files with 145 additions and 187 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
fs/binfmt_flat.c
View File

@@ -42,6 +42,11 @@
#include <asm/unaligned.h>
#include <asm/cacheflush.h>
#include <asm/page.h>
#include <asm/flat.h>
#ifndef flat_get_relocate_addr
#define flat_get_relocate_addr(rel) (rel)
#endif
/****************************************************************************/
@@ -63,6 +68,12 @@
#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
#ifdef CONFIG_BINFMT_SHARED_FLAT
#define MAX_SHARED_LIBS (4)
#else
#define MAX_SHARED_LIBS (1)
#endif
struct lib_info {
struct {
unsigned long start_code; /* Start of text segment */
@@ -120,14 +131,15 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start
sp -= bprm->envc + 1;
sp -= bprm->argc + 1;
sp -= flat_argvp_envp_on_stack() ? 2 : 0;
if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK))
sp -= 2; /* argvp + envp */
sp -= 1; /* &argc */
current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN;
sp = (unsigned long __user *)current->mm->start_stack;
__put_user(bprm->argc, sp++);
if (flat_argvp_envp_on_stack()) {
if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) {
unsigned long argv, envp;
argv = (unsigned long)(sp + 2);
envp = (unsigned long)(sp + 2 + bprm->argc + 1);
@@ -345,7 +357,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
start_code = p->lib_list[id].start_code;
text_len = p->lib_list[id].text_len;
if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
if (r > start_brk - start_data + text_len) {
pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
r, start_brk-start_data+text_len, text_len);
goto failed;
@@ -368,6 +380,7 @@ failed:
/****************************************************************************/
#ifdef CONFIG_BINFMT_FLAT_OLD
static void old_reloc(unsigned long rl)
{
static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
@@ -405,6 +418,7 @@ static void old_reloc(unsigned long rl)
pr_debug("Relocation became %lx\n", val);
}
#endif /* CONFIG_BINFMT_FLAT_OLD */
/****************************************************************************/
@@ -415,7 +429,8 @@ static int load_flat_file(struct linux_binprm *bprm,
unsigned long textpos, datapos, realdatastart;
u32 text_len, data_len, bss_len, stack_len, full_data, flags;
unsigned long len, memp, memp_size, extra, rlim;
u32 __user *reloc, *rp;
__be32 __user *reloc;
u32 __user *rp;
struct inode *inode;
int i, rev, relocs;
loff_t fpos;
@@ -454,6 +469,7 @@ static int load_flat_file(struct linux_binprm *bprm,
if (flags & FLAT_FLAG_KTRACE)
pr_info("Loading file: %s\n", bprm->filename);
#ifdef CONFIG_BINFMT_FLAT_OLD
if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
rev, FLAT_VERSION, OLD_FLAT_VERSION);
@@ -469,6 +485,23 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
/*
* fix up the flags for the older format, there were all kinds
* of endian hacks, this only works for the simple cases
*/
if (rev == OLD_FLAT_VERSION &&
(flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
flags = FLAT_FLAG_RAM;
#else /* CONFIG_BINFMT_FLAT_OLD */
if (rev != FLAT_VERSION) {
pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
rev, FLAT_VERSION);
ret = -ENOEXEC;
goto err;
}
#endif /* !CONFIG_BINFMT_FLAT_OLD */
/*
* Make sure the header params are sane.
* 28 bits (256 MB) is way more than reasonable in this case.
@@ -480,13 +513,6 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
/*
* fix up the flags for the older format, there were all kinds
* of endian hacks, this only works for the simple cases
*/
if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
flags = FLAT_FLAG_RAM;
#ifndef CONFIG_BINFMT_ZFLAT
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
pr_err("Support for ZFLAT executables is not enabled.\n");
@@ -547,7 +573,7 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
len = data_len + extra;
len = PAGE_ALIGN(len);
realdatastart = vm_mmap(NULL, 0, len,
PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
@@ -561,9 +587,7 @@ static int load_flat_file(struct linux_binprm *bprm,
vm_munmap(textpos, text_len);
goto err;
}
datapos = ALIGN(realdatastart +
MAX_SHARED_LIBS * sizeof(unsigned long),
FLAT_DATA_ALIGN);
datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN);
pr_debug("Allocated data+bss+stack (%u bytes): %lx\n",
data_len + bss_len + stack_len, datapos);
@@ -587,13 +611,13 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
reloc = (u32 __user *)
reloc = (__be32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = realdatastart;
memp_size = len;
} else {
len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32);
len = text_len + data_len + extra;
len = PAGE_ALIGN(len);
textpos = vm_mmap(NULL, 0, len,
PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
@@ -608,11 +632,9 @@ static int load_flat_file(struct linux_binprm *bprm,
}
realdatastart = textpos + ntohl(hdr->data_start);
datapos = ALIGN(realdatastart +
MAX_SHARED_LIBS * sizeof(u32),
FLAT_DATA_ALIGN);
datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN);
reloc = (u32 __user *)
reloc = (__be32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = textpos;
memp_size = len;
@@ -627,8 +649,9 @@ static int load_flat_file(struct linux_binprm *bprm,
(text_len + full_data
- sizeof(struct flat_hdr)),
0);
memmove((void *) datapos, (void *) realdatastart,
full_data);
if (datapos != realdatastart)
memmove((void *)datapos, (void *)realdatastart,
full_data);
#else
/*
* This is used on MMU systems mainly for testing.
@@ -684,8 +707,7 @@ static int load_flat_file(struct linux_binprm *bprm,
if (IS_ERR_VALUE(result)) {
ret = result;
pr_err("Unable to read code+data+bss, errno %d\n", ret);
vm_munmap(textpos, text_len + data_len + extra +
MAX_SHARED_LIBS * sizeof(u32));
vm_munmap(textpos, text_len + data_len + extra);
goto err;
}
}
@@ -775,20 +797,18 @@ static int load_flat_file(struct linux_binprm *bprm,
* __start to address 4 so that is okay).
*/
if (rev > OLD_FLAT_VERSION) {
u32 __maybe_unused persistent = 0;
for (i = 0; i < relocs; i++) {
u32 addr, relval;
__be32 tmp;
/*
* Get the address of the pointer to be
* relocated (of course, the address has to be
* relocated first).
*/
if (get_user(relval, reloc + i))
if (get_user(tmp, reloc + i))
return -EFAULT;
relval = ntohl(relval);
if (flat_set_persistent(relval, &persistent))
continue;
relval = ntohl(tmp);
addr = flat_get_relocate_addr(relval);
rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
if (rp == (u32 __user *)RELOC_FAILED) {
@@ -797,8 +817,7 @@ static int load_flat_file(struct linux_binprm *bprm,
}
/* Get the pointer's value. */
ret = flat_get_addr_from_rp(rp, relval, flags,
&addr, &persistent);
ret = flat_get_addr_from_rp(rp, relval, flags, &addr);
if (unlikely(ret))
goto err;
@@ -807,8 +826,13 @@ static int load_flat_file(struct linux_binprm *bprm,
* Do the relocation. PIC relocs in the data section are
* already in target order
*/
if ((flags & FLAT_FLAG_GOTPIC) == 0)
addr = ntohl(addr);
if ((flags & FLAT_FLAG_GOTPIC) == 0) {
/*
* Meh, the same value can have a different
* byte order based on a flag..
*/
addr = ntohl((__force __be32)addr);
}
addr = calc_reloc(addr, libinfo, id, 0);
if (addr == RELOC_FAILED) {
ret = -ENOEXEC;
@@ -821,14 +845,15 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
}
#ifdef CONFIG_BINFMT_FLAT_OLD
} else {
for (i = 0; i < relocs; i++) {
u32 relval;
__be32 relval;
if (get_user(relval, reloc + i))
return -EFAULT;
relval = ntohl(relval);
old_reloc(relval);
old_reloc(ntohl(relval));
}
#endif /* CONFIG_BINFMT_FLAT_OLD */
}
flush_icache_range(start_code, end_code);