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binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail

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on MMU targets EFAULT is possible here.  Make both return 0 or error,
passing what used to be the return value of flat_get_addr_from_rp()
by reference.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-05-02 19:52:17 -04:00
parent 2ea659a9ef
commit 468138d785
12 changed files with 168 additions and 81 deletions
Download patch file Download diff file Expand all files Collapse all files

39
fs/binfmt_flat.c
View file

@ -422,9 +422,9 @@ static int load_flat_file(struct linux_binprm *bprm,
{
struct flat_hdr *hdr;
unsigned long textpos, datapos, realdatastart;
unsigned long text_len, data_len, bss_len, stack_len, full_data, flags;
u32 text_len, data_len, bss_len, stack_len, full_data, flags;
unsigned long len, memp, memp_size, extra, rlim;
unsigned long __user *reloc, *rp;
u32 __user *reloc, *rp;
struct inode *inode;
int i, rev, relocs;
loff_t fpos;
@ -596,13 +596,13 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}
reloc = (unsigned long __user *)
reloc = (u32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = realdatastart;
memp_size = len;
} else {
len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32);
len = PAGE_ALIGN(len);
textpos = vm_mmap(NULL, 0, len,
PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
@ -618,10 +618,10 @@ static int load_flat_file(struct linux_binprm *bprm,
realdatastart = textpos + ntohl(hdr->data_start);
datapos = ALIGN(realdatastart +
MAX_SHARED_LIBS * sizeof(unsigned long),
MAX_SHARED_LIBS * sizeof(u32),
FLAT_DATA_ALIGN);
reloc = (unsigned long __user *)
reloc = (u32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = textpos;
memp_size = len;
@ -694,7 +694,7 @@ static int load_flat_file(struct linux_binprm *bprm,
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(unsigned long));
MAX_SHARED_LIBS * sizeof(u32));
goto err;
}
}
@ -754,8 +754,8 @@ static int load_flat_file(struct linux_binprm *bprm,
* image.
*/
if (flags & FLAT_FLAG_GOTPIC) {
for (rp = (unsigned long __user *)datapos; ; rp++) {
unsigned long addr, rp_val;
for (rp = (u32 __user *)datapos; ; rp++) {
u32 addr, rp_val;
if (get_user(rp_val, rp))
return -EFAULT;
if (rp_val == 0xffffffff)
@ -784,9 +784,9 @@ static int load_flat_file(struct linux_binprm *bprm,
* __start to address 4 so that is okay).
*/
if (rev > OLD_FLAT_VERSION) {
unsigned long __maybe_unused persistent = 0;
u32 __maybe_unused persistent = 0;
for (i = 0; i < relocs; i++) {
unsigned long addr, relval;
u32 addr, relval;
/*
* Get the address of the pointer to be
@ -799,15 +799,18 @@ static int load_flat_file(struct linux_binprm *bprm,
if (flat_set_persistent(relval, &persistent))
continue;
addr = flat_get_relocate_addr(relval);
rp = (unsigned long __user *)calc_reloc(addr, libinfo, id, 1);
if (rp == (unsigned long __user *)RELOC_FAILED) {
rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
if (rp == (u32 __user *)RELOC_FAILED) {
ret = -ENOEXEC;
goto err;
}
/* Get the pointer's value. */
addr = flat_get_addr_from_rp(rp, relval, flags,
&persistent);
ret = flat_get_addr_from_rp(rp, relval, flags,
&addr, &persistent);
if (unlikely(ret))
goto err;
if (addr != 0) {
/*
* Do the relocation. PIC relocs in the data section are
@ -822,12 +825,14 @@ static int load_flat_file(struct linux_binprm *bprm,
}
/* Write back the relocated pointer. */
flat_put_addr_at_rp(rp, addr, relval);
ret = flat_put_addr_at_rp(rp, addr, relval);
if (unlikely(ret))
goto err;
}
}
} else {
for (i = 0; i < relocs; i++) {
unsigned long relval;
u32 relval;
if (get_user(relval, reloc + i))
return -EFAULT;
relval = ntohl(relval);