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-rw-r--r--arch/um/drivers/cow.h2
-rw-r--r--arch/um/drivers/cow_sys.h2
-rw-r--r--arch/um/drivers/cow_user.c96
-rw-r--r--arch/um/drivers/mconsole_kern.c8
-rw-r--r--arch/um/drivers/net_user.c4
-rw-r--r--arch/um/drivers/slirp_user.c2
6 files changed, 88 insertions, 26 deletions
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
index 04e3958266e0..dc36b222100b 100644
--- a/arch/um/drivers/cow.h
+++ b/arch/um/drivers/cow.h
@@ -46,7 +46,7 @@ extern int file_reader(__u64 offset, char *buf, int len, void *arg);
extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
void *arg, __u32 *version_out,
char **backing_file_out, time_t *mtime_out,
- __u64 *size_out, int *sectorsize_out,
+ unsigned long long *size_out, int *sectorsize_out,
__u32 *align_out, int *bitmap_offset_out);
extern int write_cow_header(char *cow_file, int fd, char *backing_file,
diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
index 94de4ead4f7a..7a5b4afde692 100644
--- a/arch/um/drivers/cow_sys.h
+++ b/arch/um/drivers/cow_sys.h
@@ -28,7 +28,7 @@ static inline int cow_seek_file(int fd, __u64 offset)
return(os_seek_file(fd, offset));
}
-static inline int cow_file_size(char *file, __u64 *size_out)
+static inline int cow_file_size(char *file, unsigned long long *size_out)
{
return(os_file_size(file, size_out));
}
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
index 61951b721268..6ab852bfcd3a 100644
--- a/arch/um/drivers/cow_user.c
+++ b/arch/um/drivers/cow_user.c
@@ -17,30 +17,34 @@
#define PATH_LEN_V1 256
+typedef __u32 time32_t;
+
struct cow_header_v1 {
- int magic;
- int version;
+ __s32 magic;
+ __s32 version;
char backing_file[PATH_LEN_V1];
- time_t mtime;
+ time32_t mtime;
__u64 size;
- int sectorsize;
-};
+ __s32 sectorsize;
+} __attribute__((packed));
-#define PATH_LEN_V2 MAXPATHLEN
+/* Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in
+ * case other systems have different values for MAXPATHLEN.
+ *
+ * The same must hold for V2 - we want file format compatibility, not anything
+ * else.
+ */
+#define PATH_LEN_V3 4096
+#define PATH_LEN_V2 PATH_LEN_V3
struct cow_header_v2 {
__u32 magic;
__u32 version;
char backing_file[PATH_LEN_V2];
- time_t mtime;
+ time32_t mtime;
__u64 size;
- int sectorsize;
-};
-
-/* Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in
- * case other systems have different values for MAXPATHLEN
- */
-#define PATH_LEN_V3 4096
+ __s32 sectorsize;
+} __attribute__((packed));
/* Changes from V2 -
* PATH_LEN_V3 as described above
@@ -66,6 +70,15 @@ struct cow_header_v2 {
* Fixed (finally!) the rounding bug
*/
+/* Until Dec2005, __attribute__((packed)) was left out from the below
+ * definition, leading on 64-bit systems to 4 bytes of padding after mtime, to
+ * align size to 8-byte alignment. This shifted all fields above (no padding
+ * was present on 32-bit, no other padding was added).
+ *
+ * However, this _can be detected_: it means that cow_format (always 0 until
+ * now) is shifted onto the first 4 bytes of backing_file, where it is otherwise
+ * impossible to find 4 zeros. -bb */
+
struct cow_header_v3 {
__u32 magic;
__u32 version;
@@ -75,7 +88,19 @@ struct cow_header_v3 {
__u32 alignment;
__u32 cow_format;
char backing_file[PATH_LEN_V3];
-};
+} __attribute__((packed));
+
+/* This is the broken layout used by some 64-bit binaries. */
+struct cow_header_v3_broken {
+ __u32 magic;
+ __u32 version;
+ __s64 mtime;
+ __u64 size;
+ __u32 sectorsize;
+ __u32 alignment;
+ __u32 cow_format;
+ char backing_file[PATH_LEN_V3];
+} __attribute__((packed));
/* COW format definitions - for now, we have only the usual COW bitmap */
#define COW_BITMAP 0
@@ -84,6 +109,7 @@ union cow_header {
struct cow_header_v1 v1;
struct cow_header_v2 v2;
struct cow_header_v3 v3;
+ struct cow_header_v3_broken v3_b;
};
#define COW_MAGIC 0x4f4f4f4d /* MOOO */
@@ -184,8 +210,9 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
err = -EINVAL;
if(strlen(backing_file) > sizeof(header->backing_file) - 1){
+ /* Below, %zd is for a size_t value */
cow_printf("Backing file name \"%s\" is too long - names are "
- "limited to %d characters\n", backing_file,
+ "limited to %zd characters\n", backing_file,
sizeof(header->backing_file) - 1);
goto out_free;
}
@@ -300,7 +327,8 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
*align_out = *sectorsize_out;
file = header->v2.backing_file;
}
- else if(version == 3){
+ /* This is very subtle - see above at union cow_header definition */
+ else if(version == 3 && (*((int*)header->v3.backing_file) != 0)){
if(n < sizeof(header->v3)){
cow_printf("read_cow_header - failed to read V3 "
"header\n");
@@ -310,9 +338,43 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
*size_out = ntohll(header->v3.size);
*sectorsize_out = ntohl(header->v3.sectorsize);
*align_out = ntohl(header->v3.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
*bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);
file = header->v3.backing_file;
}
+ else if(version == 3){
+ cow_printf("read_cow_header - broken V3 file with"
+ " 64-bit layout - recovering content.\n");
+
+ if(n < sizeof(header->v3_b)){
+ cow_printf("read_cow_header - failed to read V3 "
+ "header\n");
+ goto out;
+ }
+
+ /* this was used until Dec2005 - 64bits are needed to represent
+ * 2038+. I.e. we can safely do this truncating cast.
+ *
+ * Additionally, we must use ntohl() instead of ntohll(), since
+ * the program used to use the former (tested - I got mtime
+ * mismatch "0 vs whatever").
+ *
+ * Ever heard about bug-to-bug-compatibility ? ;-) */
+ *mtime_out = (time32_t) ntohl(header->v3_b.mtime);
+
+ *size_out = ntohll(header->v3_b.size);
+ *sectorsize_out = ntohl(header->v3_b.sectorsize);
+ *align_out = ntohl(header->v3_b.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
+ *bitmap_offset_out = ROUND_UP(sizeof(header->v3_b), *align_out);
+ file = header->v3_b.backing_file;
+ }
else {
cow_printf("read_cow_header - invalid COW version\n");
goto out;
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 28e3760e8b98..6d7173fc55a3 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -62,7 +62,7 @@ static void mc_work_proc(void *unused)
unsigned long flags;
while(!list_empty(&mc_requests)){
- local_save_flags(flags);
+ local_irq_save(flags);
req = list_entry(mc_requests.next, struct mconsole_entry,
list);
list_del(&req->list);
@@ -87,7 +87,7 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id,
if(req.cmd->context == MCONSOLE_INTR)
(*req.cmd->handler)(&req);
else {
- new = kmalloc(sizeof(*new), GFP_ATOMIC);
+ new = kmalloc(sizeof(*new), GFP_NOWAIT);
if(new == NULL)
mconsole_reply(&req, "Out of memory", 1, 0);
else {
@@ -415,7 +415,6 @@ static int mem_config(char *str)
unplugged = page_address(page);
if(unplug_index == UNPLUGGED_PER_PAGE){
- INIT_LIST_HEAD(&unplugged->list);
list_add(&unplugged->list, &unplugged_pages);
unplug_index = 0;
}
@@ -616,7 +615,7 @@ static void console_write(struct console *console, const char *string,
return;
while(1){
- n = min((size_t)len, ARRAY_SIZE(console_buf) - console_index);
+ n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index);
strncpy(&console_buf[console_index], string, n);
console_index += n;
string += n;
@@ -655,7 +654,6 @@ static void with_console(struct mc_request *req, void (*proc)(void *),
struct mconsole_entry entry;
unsigned long flags;
- INIT_LIST_HEAD(&entry.list);
entry.request = *req;
list_add(&entry.list, &clients);
spin_lock_irqsave(&console_lock, flags);
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index 0e2f06187ea7..0a7786e00cfb 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -182,7 +182,9 @@ static int change_tramp(char **argv, char *output, int output_len)
pe_data.stdout = fds[1];
pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
- read_output(fds[0], output, output_len);
+ if (pid > 0) /* Avoid hang as we won't get data in failure case. */
+ read_output(fds[0], output, output_len);
+
os_close_file(fds[0]);
os_close_file(fds[1]);
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
index b94c66114bc8..33c5f6e625e8 100644
--- a/arch/um/drivers/slirp_user.c
+++ b/arch/um/drivers/slirp_user.c
@@ -104,7 +104,7 @@ static void slirp_close(int fd, void *data)
}
if(err == 0) {
- printk("slirp_close: process %d has not exited\n");
+ printk("slirp_close: process %d has not exited\n", pri->pid);
return;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 19:16:50 +0000