new helper: read_code()
switch binfmts that use ->read() to that (and to kernel_read()
in several cases in binfmt_flat - sure, it's nommu, but still,
doing ->read() into kmalloc'ed buffer...)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 2036d21..d50bbe5 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -207,11 +207,12 @@
/* Read in first chunk of data and parse gzip header. */
fpos = offset;
- ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
+ ret = kernel_read(bprm->file, offset, buf, LBUFSIZE);
strm.next_in = buf;
strm.avail_in = ret;
strm.total_in = 0;
+ fpos += ret;
retval = -ENOEXEC;
@@ -277,7 +278,7 @@
}
while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
- ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
+ ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE);
if (ret <= 0)
break;
len -= ret;
@@ -285,6 +286,7 @@
strm.next_in = buf;
strm.avail_in = ret;
strm.total_in = 0;
+ fpos += ret;
}
if (ret < 0) {
@@ -428,6 +430,7 @@
unsigned long textpos = 0, datapos = 0, result;
unsigned long realdatastart = 0;
unsigned long text_len, data_len, bss_len, stack_len, flags;
+ unsigned long full_data;
unsigned long len, memp = 0;
unsigned long memp_size, extra, rlim;
unsigned long *reloc = 0, *rp;
@@ -451,6 +454,7 @@
relocs = ntohl(hdr->reloc_count);
flags = ntohl(hdr->flags);
rev = ntohl(hdr->rev);
+ full_data = data_len + relocs * sizeof(unsigned long);
if (strncmp(hdr->magic, "bFLT", 4)) {
/*
@@ -577,12 +581,12 @@
#ifdef CONFIG_BINFMT_ZFLAT
if (flags & FLAT_FLAG_GZDATA) {
result = decompress_exec(bprm, fpos, (char *) datapos,
- data_len + (relocs * sizeof(unsigned long)), 0);
+ full_data, 0);
} else
#endif
{
- result = bprm->file->f_op->read(bprm->file, (char *) datapos,
- data_len + (relocs * sizeof(unsigned long)), &fpos);
+ result = read_code(bprm->file, datapos, fpos,
+ full_data);
}
if (IS_ERR_VALUE(result)) {
printk("Unable to read data+bss, errno %d\n", (int)-result);
@@ -627,30 +631,25 @@
if (flags & FLAT_FLAG_GZIP) {
result = decompress_exec(bprm, sizeof (struct flat_hdr),
(((char *) textpos) + sizeof (struct flat_hdr)),
- (text_len + data_len + (relocs * sizeof(unsigned long))
+ (text_len + full_data
- sizeof (struct flat_hdr)),
0);
memmove((void *) datapos, (void *) realdatastart,
- data_len + (relocs * sizeof(unsigned long)));
+ full_data);
} else if (flags & FLAT_FLAG_GZDATA) {
- fpos = 0;
- result = bprm->file->f_op->read(bprm->file,
- (char *) textpos, text_len, &fpos);
+ result = read_code(bprm->file, textpos, 0, text_len);
if (!IS_ERR_VALUE(result))
result = decompress_exec(bprm, text_len, (char *) datapos,
- data_len + (relocs * sizeof(unsigned long)), 0);
+ full_data, 0);
}
else
#endif
{
- fpos = 0;
- result = bprm->file->f_op->read(bprm->file,
- (char *) textpos, text_len, &fpos);
- if (!IS_ERR_VALUE(result)) {
- fpos = ntohl(hdr->data_start);
- result = bprm->file->f_op->read(bprm->file, (char *) datapos,
- data_len + (relocs * sizeof(unsigned long)), &fpos);
- }
+ result = read_code(bprm->file, textpos, 0, text_len);
+ if (!IS_ERR_VALUE(result))
+ result = read_code(bprm->file, datapos,
+ ntohl(hdr->data_start),
+ full_data);
}
if (IS_ERR_VALUE(result)) {
printk("Unable to read code+data+bss, errno %d\n",(int)-result);