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-rw-r--r--init/initramfs.c60
1 files changed, 45 insertions, 15 deletions
diff --git a/init/initramfs.c b/init/initramfs.c
index a8497fab1c3d..bece48c3461e 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -19,6 +19,29 @@
#include <linux/syscalls.h>
#include <linux/utime.h>
+static ssize_t __init xwrite(int fd, const char *p, size_t count)
+{
+ ssize_t out = 0;
+
+ /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
+ while (count) {
+ ssize_t rv = sys_write(fd, p, count);
+
+ if (rv < 0) {
+ if (rv == -EINTR || rv == -EAGAIN)
+ continue;
+ return out ? out : rv;
+ } else if (rv == 0)
+ break;
+
+ p += rv;
+ out += rv;
+ count -= rv;
+ }
+
+ return out;
+}
+
static __initdata char *message;
static void __init error(char *x)
{
@@ -174,7 +197,7 @@ static __initdata enum state {
} state, next_state;
static __initdata char *victim;
-static __initdata unsigned count;
+static unsigned long count __initdata;
static __initdata loff_t this_header, next_header;
static inline void __init eat(unsigned n)
@@ -186,7 +209,7 @@ static inline void __init eat(unsigned n)
static __initdata char *vcollected;
static __initdata char *collected;
-static __initdata int remains;
+static long remains __initdata;
static __initdata char *collect;
static void __init read_into(char *buf, unsigned size, enum state next)
@@ -213,7 +236,7 @@ static int __init do_start(void)
static int __init do_collect(void)
{
- unsigned n = remains;
+ unsigned long n = remains;
if (count < n)
n = count;
memcpy(collect, victim, n);
@@ -346,7 +369,8 @@ static int __init do_name(void)
static int __init do_copy(void)
{
if (count >= body_len) {
- sys_write(wfd, victim, body_len);
+ if (xwrite(wfd, victim, body_len) != body_len)
+ error("write error");
sys_close(wfd);
do_utime(vcollected, mtime);
kfree(vcollected);
@@ -354,7 +378,8 @@ static int __init do_copy(void)
state = SkipIt;
return 0;
} else {
- sys_write(wfd, victim, count);
+ if (xwrite(wfd, victim, count) != count)
+ error("write error");
body_len -= count;
eat(count);
return 1;
@@ -384,7 +409,7 @@ static __initdata int (*actions[])(void) = {
[Reset] = do_reset,
};
-static int __init write_buffer(char *buf, unsigned len)
+static long __init write_buffer(char *buf, unsigned long len)
{
count = len;
victim = buf;
@@ -394,11 +419,11 @@ static int __init write_buffer(char *buf, unsigned len)
return len - count;
}
-static int __init flush_buffer(void *bufv, unsigned len)
+static long __init flush_buffer(void *bufv, unsigned long len)
{
char *buf = (char *) bufv;
- int written;
- int origLen = len;
+ long written;
+ long origLen = len;
if (message)
return -1;
while ((written = write_buffer(buf, len)) < len && !message) {
@@ -417,13 +442,13 @@ static int __init flush_buffer(void *bufv, unsigned len)
return origLen;
}
-static unsigned my_inptr; /* index of next byte to be processed in inbuf */
+static unsigned long my_inptr; /* index of next byte to be processed in inbuf */
#include <linux/decompress/generic.h>
-static char * __init unpack_to_rootfs(char *buf, unsigned len)
+static char * __init unpack_to_rootfs(char *buf, unsigned long len)
{
- int written, res;
+ long written;
decompress_fn decompress;
const char *compress_name;
static __initdata char msg_buf[64];
@@ -457,7 +482,7 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len)
decompress = decompress_method(buf, len, &compress_name);
pr_debug("Detected %s compressed data\n", compress_name);
if (decompress) {
- res = decompress(buf, len, NULL, flush_buffer, NULL,
+ int res = decompress(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error);
if (res)
error("decompressor failed");
@@ -603,8 +628,13 @@ static int __init populate_rootfs(void)
fd = sys_open("/initrd.image",
O_WRONLY|O_CREAT, 0700);
if (fd >= 0) {
- sys_write(fd, (char *)initrd_start,
- initrd_end - initrd_start);
+ ssize_t written = xwrite(fd, (char *)initrd_start,
+ initrd_end - initrd_start);
+
+ if (written != initrd_end - initrd_start)
+ pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
+ written, initrd_end - initrd_start);
+
sys_close(fd);
free_initrd();
}