Re: [Qemu-devel] [PATCH] hostmem-file: reject invalid pmem file sizes
On Tue, Feb 12, 2019 at 03:44:46PM +0100, Igor Mammedov wrote:
> > diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
> > index ba601ce940..325ab4aad9 100644
> > --- a/backends/hostmem-file.c
> > +++ b/backends/hostmem-file.c
> > @@ -46,6 +46,22 @@ file_backend_memory_alloc(HostMemoryBackend *backend,
> > Error **errp)
> > gchar *name;
> > #endif
> >
> > +/*
> > + * Verify pmem file size since starting a guest with an incorrect size
> > + * leads to confusing failures inside the guest.
> > + */
> > +if (fb->is_pmem && fb->mem_path) {
> > +uint64_t size;
> > +
> > +size = qemu_get_pmem_size(fb->mem_path, NULL);
>
> Did you ignore error intentionally?
Hmm...I think I can now propagate the error. Originally the function
only handled devdax chardevs so it would fail for a regular file on a
DAX file system and that shouldn't stop QEMU startup. But now that it
supports regular files too I can't think of inputs that lead to a false
positive.
Will fix in v2.
Stefan
signature.asc
Description: PGP signature
Re: [Qemu-devel] [PATCH] hostmem-file: reject invalid pmem file sizes
On Tue, 12 Feb 2019 10:52:41 +0800
Stefan Hajnoczi wrote:
> Guests started with NVDIMMs larger than the underlying host file produce
> confusing errors inside the guest. This happens because the guest
> accesses pages beyond the end of the file.
>
> Check the pmem file size on startup and print a clear error message if
> the size is invalid.
>
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1669053
> Cc: Haozhong Zhang
> Cc: Zhang Yi
> Cc: Eduardo Habkost
> Cc: Igor Mammedov
> Signed-off-by: Stefan Hajnoczi
> ---
> include/qemu/osdep.h| 13 ++
> backends/hostmem-file.c | 16 +
> util/oslib-posix.c | 53 +
> util/oslib-win32.c | 5
> 4 files changed, 87 insertions(+)
>
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index 840af09cb0..303d315c5d 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -570,6 +570,19 @@ void qemu_set_tty_echo(int fd, bool echo);
> void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
> Error **errp);
>
> +/**
> + * qemu_get_pmem_size:
> + * @filename: path to a pmem file
> + * @errp: pointer to a NULL-initialized error object
> + *
> + * Determine the size of a persistent memory file. Besides supporting files
> on
> + * DAX file systems, this function also supports Linux devdax character
> + * devices.
> + *
> + * Returns: the size or 0 on failure
> + */
> +uint64_t qemu_get_pmem_size(const char *filename, Error **errp);
> +
> /**
> * qemu_get_pid_name:
> * @pid: pid of a process
> diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
> index ba601ce940..325ab4aad9 100644
> --- a/backends/hostmem-file.c
> +++ b/backends/hostmem-file.c
> @@ -46,6 +46,22 @@ file_backend_memory_alloc(HostMemoryBackend *backend,
> Error **errp)
> gchar *name;
> #endif
>
> +/*
> + * Verify pmem file size since starting a guest with an incorrect size
> + * leads to confusing failures inside the guest.
> + */
> +if (fb->is_pmem && fb->mem_path) {
> +uint64_t size;
> +
> +size = qemu_get_pmem_size(fb->mem_path, NULL);
Did you ignore error intentionally?
> +if (size && backend->size > size) {
> +error_setg(errp, "size property %" PRIu64 " is larger than "
> + "pmem file \"%s\" size %" PRIu64, backend->size,
> + fb->mem_path, size);
> +return;
> +}
> +}
> +
> if (!backend->size) {
> error_setg(errp, "can't create backend with size 0");
> return;
> diff --git a/util/oslib-posix.c b/util/oslib-posix.c
> index 37c5854b9c..10d90d1783 100644
> --- a/util/oslib-posix.c
> +++ b/util/oslib-posix.c
> @@ -500,6 +500,59 @@ void os_mem_prealloc(int fd, char *area, size_t memory,
> int smp_cpus,
> }
> }
>
> +uint64_t qemu_get_pmem_size(const char *filename, Error **errp)
> +{
> +struct stat st;
> +
> +if (stat(filename, ) < 0) {
> +error_setg(errp, "unable to stat pmem file \"%s\"", filename);
> +return 0;
> +}
> +
> +#if defined(__linux__)
> +/* Special handling for devdax character devices */
> +if (S_ISCHR(st.st_mode)) {
> +char *subsystem_path = NULL;
> +char *subsystem = NULL;
> +char *size_path = NULL;
> +char *size_str = NULL;
> +uint64_t ret = 0;
> +
> +subsystem_path = g_strdup_printf("/sys/dev/char/%d:%d/subsystem",
> + major(st.st_rdev),
> minor(st.st_rdev));
> +subsystem = g_file_read_link(subsystem_path, NULL);
> +if (!subsystem) {
> +error_setg(errp, "unable to read subsystem for pmem file \"%s\"",
> + filename);
> +goto devdax_err;
> +}
> +
> +if (!g_str_has_suffix(subsystem, "/dax")) {
> +error_setg(errp, "pmem file \"%s\" is not a dax device",
> filename);
> +goto devdax_err;
> +}
> +
> +size_path = g_strdup_printf("/sys/dev/char/%d:%d/size",
> +major(st.st_rdev), minor(st.st_rdev));
> +if (!g_file_get_contents(size_path, _str, NULL, NULL)) {
> +error_setg(errp, "unable to read size for pmem file \"%s\"",
> + size_path);
> +goto devdax_err;
> +}
> +
> +ret = g_ascii_strtoull(size_str, NULL, 0);
> +
> +devdax_err:
> +g_free(size_str);
> +g_free(size_path);
> +g_free(subsystem);
> +g_free(subsystem_path);
> +return ret;
> +}
> +#endif /* defined(__linux__) */
> +
> +return st.st_size;
> +}
>
> char *qemu_get_pid_name(pid_t pid)
> {
> diff --git a/util/oslib-win32.c b/util/oslib-win32.c
> index b4c17f5dfa..bd633afab6 100644
> --- a/util/oslib-win32.c
> +++ b/util/oslib-win32.c
> @@ -560,6 +560,11 @@ void
Re: [Qemu-devel] [PATCH] hostmem-file: reject invalid pmem file sizes
Hi Stefan,
>
> Guests started with NVDIMMs larger than the underlying host file produce
> confusing errors inside the guest. This happens because the guest
> accesses pages beyond the end of the file.
>
> Check the pmem file size on startup and print a clear error message if
> the size is invalid.
>
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1669053
> Cc: Haozhong Zhang
> Cc: Zhang Yi
> Cc: Eduardo Habkost
> Cc: Igor Mammedov
> Signed-off-by: Stefan Hajnoczi
> ---
> include/qemu/osdep.h| 13 ++
> backends/hostmem-file.c | 16 +
> util/oslib-posix.c | 53 +
> util/oslib-win32.c | 5
> 4 files changed, 87 insertions(+)
>
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index 840af09cb0..303d315c5d 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -570,6 +570,19 @@ void qemu_set_tty_echo(int fd, bool echo);
> void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
> Error **errp);
>
> +/**
> + * qemu_get_pmem_size:
> + * @filename: path to a pmem file
> + * @errp: pointer to a NULL-initialized error object
> + *
> + * Determine the size of a persistent memory file. Besides supporting files
> on
> + * DAX file systems, this function also supports Linux devdax character
> + * devices.
> + *
> + * Returns: the size or 0 on failure
> + */
> +uint64_t qemu_get_pmem_size(const char *filename, Error **errp);
> +
> /**
> * qemu_get_pid_name:
> * @pid: pid of a process
> diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
> index ba601ce940..325ab4aad9 100644
> --- a/backends/hostmem-file.c
> +++ b/backends/hostmem-file.c
> @@ -46,6 +46,22 @@ file_backend_memory_alloc(HostMemoryBackend *backend,
> Error **errp)
> gchar *name;
> #endif
>
> +/*
> + * Verify pmem file size since starting a guest with an incorrect size
> + * leads to confusing failures inside the guest.
> + */
> +if (fb->is_pmem && fb->mem_path) {
> +uint64_t size;
> +
> +size = qemu_get_pmem_size(fb->mem_path, NULL);
> +if (size && backend->size > size) {
> +error_setg(errp, "size property %" PRIu64 " is larger than "
> + "pmem file \"%s\" size %" PRIu64, backend->size,
> + fb->mem_path, size);
> +return;
> +}
> +}
> +
> if (!backend->size) {
> error_setg(errp, "can't create backend with size 0");
> return;
> diff --git a/util/oslib-posix.c b/util/oslib-posix.c
> index 37c5854b9c..10d90d1783 100644
> --- a/util/oslib-posix.c
> +++ b/util/oslib-posix.c
> @@ -500,6 +500,59 @@ void os_mem_prealloc(int fd, char *area, size_t memory,
> int smp_cpus,
> }
> }
>
> +uint64_t qemu_get_pmem_size(const char *filename, Error **errp)
> +{
> +struct stat st;
> +
> +if (stat(filename, ) < 0) {
> +error_setg(errp, "unable to stat pmem file \"%s\"", filename);
> +return 0;
> +}
> +
> +#if defined(__linux__)
> +/* Special handling for devdax character devices */
> +if (S_ISCHR(st.st_mode)) {
> +char *subsystem_path = NULL;
> +char *subsystem = NULL;
> +char *size_path = NULL;
> +char *size_str = NULL;
> +uint64_t ret = 0;
> +
> +subsystem_path = g_strdup_printf("/sys/dev/char/%d:%d/subsystem",
> + major(st.st_rdev),
> minor(st.st_rdev));
> +subsystem = g_file_read_link(subsystem_path, NULL);
> +if (!subsystem) {
> +error_setg(errp, "unable to read subsystem for pmem file
> \"%s\"",
> + filename);
> +goto devdax_err;
> +}
> +
> +if (!g_str_has_suffix(subsystem, "/dax")) {
> +error_setg(errp, "pmem file \"%s\" is not a dax device",
> filename);
> +goto devdax_err;
> +}
> +
> +size_path = g_strdup_printf("/sys/dev/char/%d:%d/size",
> +major(st.st_rdev), minor(st.st_rdev));
> +if (!g_file_get_contents(size_path, _str, NULL, NULL)) {
> +error_setg(errp, "unable to read size for pmem file \"%s\"",
> + size_path);
> +goto devdax_err;
> +}
> +
> +ret = g_ascii_strtoull(size_str, NULL, 0);
> +
> +devdax_err:
> +g_free(size_str);
> +g_free(size_path);
> +g_free(subsystem);
> +g_free(subsystem_path);
> +return ret;
> +}
> +#endif /* defined(__linux__) */
> +
> +return st.st_size;
> +}
>
> char *qemu_get_pid_name(pid_t pid)
> {
> diff --git a/util/oslib-win32.c b/util/oslib-win32.c
> index b4c17f5dfa..bd633afab6 100644
> --- a/util/oslib-win32.c
> +++ b/util/oslib-win32.c
> @@ -560,6 +560,11 @@ void os_mem_prealloc(int fd, char *area, size_t memory,
> int smp_cpus,
> }
> }
>
> +uint64_t qemu_get_pmem_size(const char *filename, Error
[Qemu-devel] [PATCH] hostmem-file: reject invalid pmem file sizes
Guests started with NVDIMMs larger than the underlying host file produce
confusing errors inside the guest. This happens because the guest
accesses pages beyond the end of the file.
Check the pmem file size on startup and print a clear error message if
the size is invalid.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1669053
Cc: Haozhong Zhang
Cc: Zhang Yi
Cc: Eduardo Habkost
Cc: Igor Mammedov
Signed-off-by: Stefan Hajnoczi
---
include/qemu/osdep.h| 13 ++
backends/hostmem-file.c | 16 +
util/oslib-posix.c | 53 +
util/oslib-win32.c | 5
4 files changed, 87 insertions(+)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 840af09cb0..303d315c5d 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -570,6 +570,19 @@ void qemu_set_tty_echo(int fd, bool echo);
void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
Error **errp);
+/**
+ * qemu_get_pmem_size:
+ * @filename: path to a pmem file
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Determine the size of a persistent memory file. Besides supporting files on
+ * DAX file systems, this function also supports Linux devdax character
+ * devices.
+ *
+ * Returns: the size or 0 on failure
+ */
+uint64_t qemu_get_pmem_size(const char *filename, Error **errp);
+
/**
* qemu_get_pid_name:
* @pid: pid of a process
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index ba601ce940..325ab4aad9 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -46,6 +46,22 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error
**errp)
gchar *name;
#endif
+/*
+ * Verify pmem file size since starting a guest with an incorrect size
+ * leads to confusing failures inside the guest.
+ */
+if (fb->is_pmem && fb->mem_path) {
+uint64_t size;
+
+size = qemu_get_pmem_size(fb->mem_path, NULL);
+if (size && backend->size > size) {
+error_setg(errp, "size property %" PRIu64 " is larger than "
+ "pmem file \"%s\" size %" PRIu64, backend->size,
+ fb->mem_path, size);
+return;
+}
+}
+
if (!backend->size) {
error_setg(errp, "can't create backend with size 0");
return;
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 37c5854b9c..10d90d1783 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -500,6 +500,59 @@ void os_mem_prealloc(int fd, char *area, size_t memory,
int smp_cpus,
}
}
+uint64_t qemu_get_pmem_size(const char *filename, Error **errp)
+{
+struct stat st;
+
+if (stat(filename, ) < 0) {
+error_setg(errp, "unable to stat pmem file \"%s\"", filename);
+return 0;
+}
+
+#if defined(__linux__)
+/* Special handling for devdax character devices */
+if (S_ISCHR(st.st_mode)) {
+char *subsystem_path = NULL;
+char *subsystem = NULL;
+char *size_path = NULL;
+char *size_str = NULL;
+uint64_t ret = 0;
+
+subsystem_path = g_strdup_printf("/sys/dev/char/%d:%d/subsystem",
+ major(st.st_rdev), minor(st.st_rdev));
+subsystem = g_file_read_link(subsystem_path, NULL);
+if (!subsystem) {
+error_setg(errp, "unable to read subsystem for pmem file \"%s\"",
+ filename);
+goto devdax_err;
+}
+
+if (!g_str_has_suffix(subsystem, "/dax")) {
+error_setg(errp, "pmem file \"%s\" is not a dax device", filename);
+goto devdax_err;
+}
+
+size_path = g_strdup_printf("/sys/dev/char/%d:%d/size",
+major(st.st_rdev), minor(st.st_rdev));
+if (!g_file_get_contents(size_path, _str, NULL, NULL)) {
+error_setg(errp, "unable to read size for pmem file \"%s\"",
+ size_path);
+goto devdax_err;
+}
+
+ret = g_ascii_strtoull(size_str, NULL, 0);
+
+devdax_err:
+g_free(size_str);
+g_free(size_path);
+g_free(subsystem);
+g_free(subsystem_path);
+return ret;
+}
+#endif /* defined(__linux__) */
+
+return st.st_size;
+}
char *qemu_get_pid_name(pid_t pid)
{
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index b4c17f5dfa..bd633afab6 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -560,6 +560,11 @@ void os_mem_prealloc(int fd, char *area, size_t memory,
int smp_cpus,
}
}
+uint64_t qemu_get_pmem_size(const char *filename, Error **errp)
+{
+error_setg(errp, "pmem support not available");
+return 0;
+}
char *qemu_get_pid_name(pid_t pid)
{
--
2.20.1
