* [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
@ 2022-05-27 2:55 ` Pasha Tatashin
0 siblings, 0 replies; 21+ messages in thread
From: Pasha Tatashin @ 2022-05-27 2:55 UTC (permalink / raw)
To: kexec
Currently, the maximum file size that is supported is 2G. This may be
too small in some cases. For example, kexec_file_load() system call
loads initramfs. In some netboot cases initramfs can be rather large.
Allow to use up-to ssize_t bytes. The callers still can limit the
maximum file size via buf_size.
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
---
fs/kernel_read_file.c | 38 ++++++++++++++++----------------
include/linux/kernel_read_file.h | 32 +++++++++++++--------------
include/linux/limits.h | 1 +
3 files changed, 36 insertions(+), 35 deletions(-)
diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
index 1b07550485b9..5d826274570c 100644
--- a/fs/kernel_read_file.c
+++ b/fs/kernel_read_file.c
@@ -29,15 +29,15 @@
* change between calls to kernel_read_file().
*
* Returns number of bytes read (no single read will be bigger
- * than INT_MAX), or negative on error.
+ * than SSIZE_MAX), or negative on error.
*
*/
-int kernel_read_file(struct file *file, loff_t offset, void **buf,
- size_t buf_size, size_t *file_size,
- enum kernel_read_file_id id)
+ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
+ size_t buf_size, size_t *file_size,
+ enum kernel_read_file_id id)
{
loff_t i_size, pos;
- size_t copied;
+ ssize_t copied;
void *allocated = NULL;
bool whole_file;
int ret;
@@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
goto out;
}
/* The file is too big for sane activities. */
- if (i_size > INT_MAX) {
+ if (i_size > SSIZE_MAX) {
ret = -EFBIG;
goto out;
}
@@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
}
EXPORT_SYMBOL_GPL(kernel_read_file);
-int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
- size_t buf_size, size_t *file_size,
- enum kernel_read_file_id id)
+ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
+ size_t buf_size, size_t *file_size,
+ enum kernel_read_file_id id)
{
struct file *file;
- int ret;
+ ssize_t ret;
if (!path || !*path)
return -EINVAL;
@@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
}
EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
-int kernel_read_file_from_path_initns(const char *path, loff_t offset,
- void **buf, size_t buf_size,
- size_t *file_size,
- enum kernel_read_file_id id)
+ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
+ void **buf, size_t buf_size,
+ size_t *file_size,
+ enum kernel_read_file_id id)
{
struct file *file;
struct path root;
- int ret;
+ ssize_t ret;
if (!path || !*path)
return -EINVAL;
@@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
}
EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
-int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
- size_t buf_size, size_t *file_size,
- enum kernel_read_file_id id)
+ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
+ size_t buf_size, size_t *file_size,
+ enum kernel_read_file_id id)
{
struct fd f = fdget(fd);
- int ret = -EBADF;
+ ssize_t ret = -EBADF;
if (!f.file || !(f.file->f_mode & FMODE_READ))
goto out;
diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
index 575ffa1031d3..90451e2e12bd 100644
--- a/include/linux/kernel_read_file.h
+++ b/include/linux/kernel_read_file.h
@@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
return kernel_read_file_str[id];
}
-int kernel_read_file(struct file *file, loff_t offset,
- void **buf, size_t buf_size,
- size_t *file_size,
- enum kernel_read_file_id id);
-int kernel_read_file_from_path(const char *path, loff_t offset,
- void **buf, size_t buf_size,
- size_t *file_size,
- enum kernel_read_file_id id);
-int kernel_read_file_from_path_initns(const char *path, loff_t offset,
- void **buf, size_t buf_size,
- size_t *file_size,
- enum kernel_read_file_id id);
-int kernel_read_file_from_fd(int fd, loff_t offset,
- void **buf, size_t buf_size,
- size_t *file_size,
- enum kernel_read_file_id id);
+ssize_t kernel_read_file(struct file *file, loff_t offset,
+ void **buf, size_t buf_size,
+ size_t *file_size,
+ enum kernel_read_file_id id);
+ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
+ void **buf, size_t buf_size,
+ size_t *file_size,
+ enum kernel_read_file_id id);
+ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
+ void **buf, size_t buf_size,
+ size_t *file_size,
+ enum kernel_read_file_id id);
+ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
+ void **buf, size_t buf_size,
+ size_t *file_size,
+ enum kernel_read_file_id id);
#endif /* _LINUX_KERNEL_READ_FILE_H */
diff --git a/include/linux/limits.h b/include/linux/limits.h
index b568b9c30bbf..f6bcc9369010 100644
--- a/include/linux/limits.h
+++ b/include/linux/limits.h
@@ -7,6 +7,7 @@
#include <vdso/limits.h>
#define SIZE_MAX (~(size_t)0)
+#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
#define PHYS_ADDR_MAX (~(phys_addr_t)0)
#define U8_MAX ((u8)~0U)
--
2.36.1.124.g0e6072fb45-goog
^ permalink raw reply related [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
2022-05-27 2:55 ` Pasha Tatashin
@ 2022-06-06 2:45 ` Baoquan He
-1 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-06 2:45 UTC (permalink / raw)
To: Pasha Tatashin
Cc: sashal, ebiederm, rburanyi, gthelen, viro, kexec, linux-fsdevel,
linux-kernel
On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> Currently, the maximum file size that is supported is 2G. This may be
> too small in some cases. For example, kexec_file_load() system call
> loads initramfs. In some netboot cases initramfs can be rather large.
>
> Allow to use up-to ssize_t bytes. The callers still can limit the
> maximum file size via buf_size.
If we really met initramfs bigger than 2G, it's reasonable to increase
the limit. While wondering why we should take sszie_t, but not size_t.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> ---
> fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> include/linux/limits.h | 1 +
> 3 files changed, 36 insertions(+), 35 deletions(-)
>
> diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> index 1b07550485b9..5d826274570c 100644
> --- a/fs/kernel_read_file.c
> +++ b/fs/kernel_read_file.c
> @@ -29,15 +29,15 @@
> * change between calls to kernel_read_file().
> *
> * Returns number of bytes read (no single read will be bigger
> - * than INT_MAX), or negative on error.
> + * than SSIZE_MAX), or negative on error.
> *
> */
> -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> loff_t i_size, pos;
> - size_t copied;
> + ssize_t copied;
> void *allocated = NULL;
> bool whole_file;
> int ret;
> @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> goto out;
> }
> /* The file is too big for sane activities. */
> - if (i_size > INT_MAX) {
> + if (i_size > SSIZE_MAX) {
> ret = -EFBIG;
> goto out;
> }
> @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file);
>
> -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
>
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> struct path root;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
>
> -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct fd f = fdget(fd);
> - int ret = -EBADF;
> + ssize_t ret = -EBADF;
>
> if (!f.file || !(f.file->f_mode & FMODE_READ))
> goto out;
> diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> index 575ffa1031d3..90451e2e12bd 100644
> --- a/include/linux/kernel_read_file.h
> +++ b/include/linux/kernel_read_file.h
> @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> return kernel_read_file_str[id];
> }
>
> -int kernel_read_file(struct file *file, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_fd(int fd, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> +ssize_t kernel_read_file(struct file *file, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
>
> #endif /* _LINUX_KERNEL_READ_FILE_H */
> diff --git a/include/linux/limits.h b/include/linux/limits.h
> index b568b9c30bbf..f6bcc9369010 100644
> --- a/include/linux/limits.h
> +++ b/include/linux/limits.h
> @@ -7,6 +7,7 @@
> #include <vdso/limits.h>
>
> #define SIZE_MAX (~(size_t)0)
> +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> #define PHYS_ADDR_MAX (~(phys_addr_t)0)
>
> #define U8_MAX ((u8)~0U)
> --
> 2.36.1.124.g0e6072fb45-goog
>
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
@ 2022-06-06 2:45 ` Baoquan He
0 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-06 2:45 UTC (permalink / raw)
To: Pasha Tatashin
Cc: sashal, ebiederm, rburanyi, gthelen, viro, kexec, linux-fsdevel,
linux-kernel
On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> Currently, the maximum file size that is supported is 2G. This may be
> too small in some cases. For example, kexec_file_load() system call
> loads initramfs. In some netboot cases initramfs can be rather large.
>
> Allow to use up-to ssize_t bytes. The callers still can limit the
> maximum file size via buf_size.
If we really met initramfs bigger than 2G, it's reasonable to increase
the limit. While wondering why we should take sszie_t, but not size_t.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> ---
> fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> include/linux/limits.h | 1 +
> 3 files changed, 36 insertions(+), 35 deletions(-)
>
> diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> index 1b07550485b9..5d826274570c 100644
> --- a/fs/kernel_read_file.c
> +++ b/fs/kernel_read_file.c
> @@ -29,15 +29,15 @@
> * change between calls to kernel_read_file().
> *
> * Returns number of bytes read (no single read will be bigger
> - * than INT_MAX), or negative on error.
> + * than SSIZE_MAX), or negative on error.
> *
> */
> -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> loff_t i_size, pos;
> - size_t copied;
> + ssize_t copied;
> void *allocated = NULL;
> bool whole_file;
> int ret;
> @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> goto out;
> }
> /* The file is too big for sane activities. */
> - if (i_size > INT_MAX) {
> + if (i_size > SSIZE_MAX) {
> ret = -EFBIG;
> goto out;
> }
> @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file);
>
> -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
>
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> struct path root;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
>
> -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct fd f = fdget(fd);
> - int ret = -EBADF;
> + ssize_t ret = -EBADF;
>
> if (!f.file || !(f.file->f_mode & FMODE_READ))
> goto out;
> diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> index 575ffa1031d3..90451e2e12bd 100644
> --- a/include/linux/kernel_read_file.h
> +++ b/include/linux/kernel_read_file.h
> @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> return kernel_read_file_str[id];
> }
>
> -int kernel_read_file(struct file *file, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_fd(int fd, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> +ssize_t kernel_read_file(struct file *file, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
>
> #endif /* _LINUX_KERNEL_READ_FILE_H */
> diff --git a/include/linux/limits.h b/include/linux/limits.h
> index b568b9c30bbf..f6bcc9369010 100644
> --- a/include/linux/limits.h
> +++ b/include/linux/limits.h
> @@ -7,6 +7,7 @@
> #include <vdso/limits.h>
>
> #define SIZE_MAX (~(size_t)0)
> +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> #define PHYS_ADDR_MAX (~(phys_addr_t)0)
>
> #define U8_MAX ((u8)~0U)
> --
> 2.36.1.124.g0e6072fb45-goog
>
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
2022-06-06 2:45 ` Baoquan He
@ 2022-06-07 15:52 ` Pasha Tatashin
-1 siblings, 0 replies; 21+ messages in thread
From: Pasha Tatashin @ 2022-06-07 15:52 UTC (permalink / raw)
To: Baoquan He
Cc: Sasha Levin, Eric W. Biederman, rburanyi, Greg Thelen, viro,
kexec mailing list, linux-fsdevel, LKML
On Sun, Jun 5, 2022 at 10:45 PM Baoquan He <bhe@redhat.com> wrote:
>
> On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> > Currently, the maximum file size that is supported is 2G. This may be
> > too small in some cases. For example, kexec_file_load() system call
> > loads initramfs. In some netboot cases initramfs can be rather large.
> >
> > Allow to use up-to ssize_t bytes. The callers still can limit the
> > maximum file size via buf_size.
>
> If we really met initramfs bigger than 2G, it's reasonable to increase
> the limit. While wondering why we should take sszie_t, but not size_t.
ssize_t instead of size_t so we can return errors as negative values.
Pasha
>
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> > ---
> > fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> > include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> > include/linux/limits.h | 1 +
> > 3 files changed, 36 insertions(+), 35 deletions(-)
> >
> > diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> > index 1b07550485b9..5d826274570c 100644
> > --- a/fs/kernel_read_file.c
> > +++ b/fs/kernel_read_file.c
> > @@ -29,15 +29,15 @@
> > * change between calls to kernel_read_file().
> > *
> > * Returns number of bytes read (no single read will be bigger
> > - * than INT_MAX), or negative on error.
> > + * than SSIZE_MAX), or negative on error.
> > *
> > */
> > -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > loff_t i_size, pos;
> > - size_t copied;
> > + ssize_t copied;
> > void *allocated = NULL;
> > bool whole_file;
> > int ret;
> > @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > goto out;
> > }
> > /* The file is too big for sane activities. */
> > - if (i_size > INT_MAX) {
> > + if (i_size > SSIZE_MAX) {
> > ret = -EFBIG;
> > goto out;
> > }
> > @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file);
> >
> > -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct file *file;
> > - int ret;
> > + ssize_t ret;
> >
> > if (!path || !*path)
> > return -EINVAL;
> > @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
> >
> > -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct file *file;
> > struct path root;
> > - int ret;
> > + ssize_t ret;
> >
> > if (!path || !*path)
> > return -EINVAL;
> > @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
> >
> > -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct fd f = fdget(fd);
> > - int ret = -EBADF;
> > + ssize_t ret = -EBADF;
> >
> > if (!f.file || !(f.file->f_mode & FMODE_READ))
> > goto out;
> > diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> > index 575ffa1031d3..90451e2e12bd 100644
> > --- a/include/linux/kernel_read_file.h
> > +++ b/include/linux/kernel_read_file.h
> > @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> > return kernel_read_file_str[id];
> > }
> >
> > -int kernel_read_file(struct file *file, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_path(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_fd(int fd, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > +ssize_t kernel_read_file(struct file *file, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> >
> > #endif /* _LINUX_KERNEL_READ_FILE_H */
> > diff --git a/include/linux/limits.h b/include/linux/limits.h
> > index b568b9c30bbf..f6bcc9369010 100644
> > --- a/include/linux/limits.h
> > +++ b/include/linux/limits.h
> > @@ -7,6 +7,7 @@
> > #include <vdso/limits.h>
> >
> > #define SIZE_MAX (~(size_t)0)
> > +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> > #define PHYS_ADDR_MAX (~(phys_addr_t)0)
> >
> > #define U8_MAX ((u8)~0U)
> > --
> > 2.36.1.124.g0e6072fb45-goog
> >
>
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
@ 2022-06-07 15:52 ` Pasha Tatashin
0 siblings, 0 replies; 21+ messages in thread
From: Pasha Tatashin @ 2022-06-07 15:52 UTC (permalink / raw)
To: Baoquan He
Cc: Sasha Levin, Eric W. Biederman, rburanyi, Greg Thelen, viro,
kexec mailing list, linux-fsdevel, LKML
On Sun, Jun 5, 2022 at 10:45 PM Baoquan He <bhe@redhat.com> wrote:
>
> On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> > Currently, the maximum file size that is supported is 2G. This may be
> > too small in some cases. For example, kexec_file_load() system call
> > loads initramfs. In some netboot cases initramfs can be rather large.
> >
> > Allow to use up-to ssize_t bytes. The callers still can limit the
> > maximum file size via buf_size.
>
> If we really met initramfs bigger than 2G, it's reasonable to increase
> the limit. While wondering why we should take sszie_t, but not size_t.
ssize_t instead of size_t so we can return errors as negative values.
Pasha
>
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> > ---
> > fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> > include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> > include/linux/limits.h | 1 +
> > 3 files changed, 36 insertions(+), 35 deletions(-)
> >
> > diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> > index 1b07550485b9..5d826274570c 100644
> > --- a/fs/kernel_read_file.c
> > +++ b/fs/kernel_read_file.c
> > @@ -29,15 +29,15 @@
> > * change between calls to kernel_read_file().
> > *
> > * Returns number of bytes read (no single read will be bigger
> > - * than INT_MAX), or negative on error.
> > + * than SSIZE_MAX), or negative on error.
> > *
> > */
> > -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > loff_t i_size, pos;
> > - size_t copied;
> > + ssize_t copied;
> > void *allocated = NULL;
> > bool whole_file;
> > int ret;
> > @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > goto out;
> > }
> > /* The file is too big for sane activities. */
> > - if (i_size > INT_MAX) {
> > + if (i_size > SSIZE_MAX) {
> > ret = -EFBIG;
> > goto out;
> > }
> > @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file);
> >
> > -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct file *file;
> > - int ret;
> > + ssize_t ret;
> >
> > if (!path || !*path)
> > return -EINVAL;
> > @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
> >
> > -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct file *file;
> > struct path root;
> > - int ret;
> > + ssize_t ret;
> >
> > if (!path || !*path)
> > return -EINVAL;
> > @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > }
> > EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
> >
> > -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> > - size_t buf_size, size_t *file_size,
> > - enum kernel_read_file_id id)
> > +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> > + size_t buf_size, size_t *file_size,
> > + enum kernel_read_file_id id)
> > {
> > struct fd f = fdget(fd);
> > - int ret = -EBADF;
> > + ssize_t ret = -EBADF;
> >
> > if (!f.file || !(f.file->f_mode & FMODE_READ))
> > goto out;
> > diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> > index 575ffa1031d3..90451e2e12bd 100644
> > --- a/include/linux/kernel_read_file.h
> > +++ b/include/linux/kernel_read_file.h
> > @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> > return kernel_read_file_str[id];
> > }
> >
> > -int kernel_read_file(struct file *file, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_path(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > -int kernel_read_file_from_fd(int fd, loff_t offset,
> > - void **buf, size_t buf_size,
> > - size_t *file_size,
> > - enum kernel_read_file_id id);
> > +ssize_t kernel_read_file(struct file *file, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> > +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> > + void **buf, size_t buf_size,
> > + size_t *file_size,
> > + enum kernel_read_file_id id);
> >
> > #endif /* _LINUX_KERNEL_READ_FILE_H */
> > diff --git a/include/linux/limits.h b/include/linux/limits.h
> > index b568b9c30bbf..f6bcc9369010 100644
> > --- a/include/linux/limits.h
> > +++ b/include/linux/limits.h
> > @@ -7,6 +7,7 @@
> > #include <vdso/limits.h>
> >
> > #define SIZE_MAX (~(size_t)0)
> > +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> > #define PHYS_ADDR_MAX (~(phys_addr_t)0)
> >
> > #define U8_MAX ((u8)~0U)
> > --
> > 2.36.1.124.g0e6072fb45-goog
> >
>
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
2022-06-07 15:52 ` Pasha Tatashin
@ 2022-06-08 0:57 ` Baoquan He
-1 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-08 0:57 UTC (permalink / raw)
To: Pasha Tatashin
Cc: Sasha Levin, Eric W. Biederman, rburanyi, Greg Thelen, viro,
kexec mailing list, linux-fsdevel, LKML
On 06/07/22 at 11:52am, Pasha Tatashin wrote:
> On Sun, Jun 5, 2022 at 10:45 PM Baoquan He <bhe@redhat.com> wrote:
> >
> > On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> > > Currently, the maximum file size that is supported is 2G. This may be
> > > too small in some cases. For example, kexec_file_load() system call
> > > loads initramfs. In some netboot cases initramfs can be rather large.
> > >
> > > Allow to use up-to ssize_t bytes. The callers still can limit the
> > > maximum file size via buf_size.
> >
> > If we really met initramfs bigger than 2G, it's reasonable to increase
> > the limit. While wondering why we should take sszie_t, but not size_t.
>
> ssize_t instead of size_t so we can return errors as negative values.
Makes sense. Thanks.
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
@ 2022-06-08 0:57 ` Baoquan He
0 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-08 0:57 UTC (permalink / raw)
To: Pasha Tatashin
Cc: Sasha Levin, Eric W. Biederman, rburanyi, Greg Thelen, viro,
kexec mailing list, linux-fsdevel, LKML
On 06/07/22 at 11:52am, Pasha Tatashin wrote:
> On Sun, Jun 5, 2022 at 10:45 PM Baoquan He <bhe@redhat.com> wrote:
> >
> > On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> > > Currently, the maximum file size that is supported is 2G. This may be
> > > too small in some cases. For example, kexec_file_load() system call
> > > loads initramfs. In some netboot cases initramfs can be rather large.
> > >
> > > Allow to use up-to ssize_t bytes. The callers still can limit the
> > > maximum file size via buf_size.
> >
> > If we really met initramfs bigger than 2G, it's reasonable to increase
> > the limit. While wondering why we should take sszie_t, but not size_t.
>
> ssize_t instead of size_t so we can return errors as negative values.
Makes sense. Thanks.
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
2022-05-27 2:55 ` Pasha Tatashin
@ 2022-06-08 0:58 ` Baoquan He
-1 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-08 0:58 UTC (permalink / raw)
To: Pasha Tatashin
Cc: sashal, ebiederm, rburanyi, akpm, gthelen, viro, kexec,
linux-fsdevel, linux-kernel
On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> Currently, the maximum file size that is supported is 2G. This may be
> too small in some cases. For example, kexec_file_load() system call
> loads initramfs. In some netboot cases initramfs can be rather large.
>
> Allow to use up-to ssize_t bytes. The callers still can limit the
> maximum file size via buf_size.
LGTM,
Acked-by: Baoquan He <bhe@redhat.com>
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> ---
> fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> include/linux/limits.h | 1 +
> 3 files changed, 36 insertions(+), 35 deletions(-)
>
> diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> index 1b07550485b9..5d826274570c 100644
> --- a/fs/kernel_read_file.c
> +++ b/fs/kernel_read_file.c
> @@ -29,15 +29,15 @@
> * change between calls to kernel_read_file().
> *
> * Returns number of bytes read (no single read will be bigger
> - * than INT_MAX), or negative on error.
> + * than SSIZE_MAX), or negative on error.
> *
> */
> -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> loff_t i_size, pos;
> - size_t copied;
> + ssize_t copied;
> void *allocated = NULL;
> bool whole_file;
> int ret;
> @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> goto out;
> }
> /* The file is too big for sane activities. */
> - if (i_size > INT_MAX) {
> + if (i_size > SSIZE_MAX) {
> ret = -EFBIG;
> goto out;
> }
> @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file);
>
> -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
>
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> struct path root;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
>
> -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct fd f = fdget(fd);
> - int ret = -EBADF;
> + ssize_t ret = -EBADF;
>
> if (!f.file || !(f.file->f_mode & FMODE_READ))
> goto out;
> diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> index 575ffa1031d3..90451e2e12bd 100644
> --- a/include/linux/kernel_read_file.h
> +++ b/include/linux/kernel_read_file.h
> @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> return kernel_read_file_str[id];
> }
>
> -int kernel_read_file(struct file *file, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_fd(int fd, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> +ssize_t kernel_read_file(struct file *file, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
>
> #endif /* _LINUX_KERNEL_READ_FILE_H */
> diff --git a/include/linux/limits.h b/include/linux/limits.h
> index b568b9c30bbf..f6bcc9369010 100644
> --- a/include/linux/limits.h
> +++ b/include/linux/limits.h
> @@ -7,6 +7,7 @@
> #include <vdso/limits.h>
>
> #define SIZE_MAX (~(size_t)0)
> +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> #define PHYS_ADDR_MAX (~(phys_addr_t)0)
>
> #define U8_MAX ((u8)~0U)
> --
> 2.36.1.124.g0e6072fb45-goog
>
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t
@ 2022-06-08 0:58 ` Baoquan He
0 siblings, 0 replies; 21+ messages in thread
From: Baoquan He @ 2022-06-08 0:58 UTC (permalink / raw)
To: Pasha Tatashin
Cc: sashal, ebiederm, rburanyi, akpm, gthelen, viro, kexec,
linux-fsdevel, linux-kernel
On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> Currently, the maximum file size that is supported is 2G. This may be
> too small in some cases. For example, kexec_file_load() system call
> loads initramfs. In some netboot cases initramfs can be rather large.
>
> Allow to use up-to ssize_t bytes. The callers still can limit the
> maximum file size via buf_size.
LGTM,
Acked-by: Baoquan He <bhe@redhat.com>
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
> ---
> fs/kernel_read_file.c | 38 ++++++++++++++++----------------
> include/linux/kernel_read_file.h | 32 +++++++++++++--------------
> include/linux/limits.h | 1 +
> 3 files changed, 36 insertions(+), 35 deletions(-)
>
> diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
> index 1b07550485b9..5d826274570c 100644
> --- a/fs/kernel_read_file.c
> +++ b/fs/kernel_read_file.c
> @@ -29,15 +29,15 @@
> * change between calls to kernel_read_file().
> *
> * Returns number of bytes read (no single read will be bigger
> - * than INT_MAX), or negative on error.
> + * than SSIZE_MAX), or negative on error.
> *
> */
> -int kernel_read_file(struct file *file, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file(struct file *file, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> loff_t i_size, pos;
> - size_t copied;
> + ssize_t copied;
> void *allocated = NULL;
> bool whole_file;
> int ret;
> @@ -58,7 +58,7 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> goto out;
> }
> /* The file is too big for sane activities. */
> - if (i_size > INT_MAX) {
> + if (i_size > SSIZE_MAX) {
> ret = -EFBIG;
> goto out;
> }
> @@ -124,12 +124,12 @@ int kernel_read_file(struct file *file, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file);
>
> -int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -144,14 +144,14 @@ int kernel_read_file_from_path(const char *path, loff_t offset, void **buf,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
>
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct file *file;
> struct path root;
> - int ret;
> + ssize_t ret;
>
> if (!path || !*path)
> return -EINVAL;
> @@ -171,12 +171,12 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> }
> EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
>
> -int kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> - size_t buf_size, size_t *file_size,
> - enum kernel_read_file_id id)
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset, void **buf,
> + size_t buf_size, size_t *file_size,
> + enum kernel_read_file_id id)
> {
> struct fd f = fdget(fd);
> - int ret = -EBADF;
> + ssize_t ret = -EBADF;
>
> if (!f.file || !(f.file->f_mode & FMODE_READ))
> goto out;
> diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
> index 575ffa1031d3..90451e2e12bd 100644
> --- a/include/linux/kernel_read_file.h
> +++ b/include/linux/kernel_read_file.h
> @@ -35,21 +35,21 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
> return kernel_read_file_str[id];
> }
>
> -int kernel_read_file(struct file *file, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_path_initns(const char *path, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> -int kernel_read_file_from_fd(int fd, loff_t offset,
> - void **buf, size_t buf_size,
> - size_t *file_size,
> - enum kernel_read_file_id id);
> +ssize_t kernel_read_file(struct file *file, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
> +ssize_t kernel_read_file_from_fd(int fd, loff_t offset,
> + void **buf, size_t buf_size,
> + size_t *file_size,
> + enum kernel_read_file_id id);
>
> #endif /* _LINUX_KERNEL_READ_FILE_H */
> diff --git a/include/linux/limits.h b/include/linux/limits.h
> index b568b9c30bbf..f6bcc9369010 100644
> --- a/include/linux/limits.h
> +++ b/include/linux/limits.h
> @@ -7,6 +7,7 @@
> #include <vdso/limits.h>
>
> #define SIZE_MAX (~(size_t)0)
> +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
> #define PHYS_ADDR_MAX (~(phys_addr_t)0)
>
> #define U8_MAX ((u8)~0U)
> --
> 2.36.1.124.g0e6072fb45-goog
>
^ permalink raw reply [flat|nested] 21+ messages in thread