From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EC828C433EF for ; Wed, 8 Jun 2022 00:59:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yhDMZTTivlfneXePLPOm7LwA/RMaotoH4e1aUnjaU30=; b=yAn7xB+he7lpvM YdlW8NjNmbBhVzSbMfT5PAeAUHxCawDmfTBSGfDwH86FI2xCjeBUuz3O1jEVSUlsQ8noCtgODqk9W Hoxwwxnd6g3h1jY3y7LBpF0JrlLacOo87MkKbsxGIRhJJsVGDd7NYTVcWkipnDT/zx+5qxc1B/cJy 3gJyNJjyq/hZNFhDX2KB+21Eb5utoKqmDRl3QHq1JGcTvq9iWF0dYjD5CeUwRDbtm61zs/odzXYA7 8ybHXMYzz981IYVzPIktbYEIO6YRG8PiJCS72z2tZilKWtmnQglt6JC85c1OptmtVh0F1dcJkQzu0 ZlDY2aZLnkVGaG/3dO5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyk2P-00ABVG-3w; Wed, 08 Jun 2022 00:59:09 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyk2M-00ABUe-2M for kexec@lists.infradead.org; Wed, 08 Jun 2022 00:59:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654649945; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=DYVGlTfcixWRpDZ+Xnrns02OLERH2O9N67sLNCT2XaM=; b=EGUwmO7PudW/6vQUhpJ/Fs0waHL9ZNkJSCRkmNgBcs/nD8e5v5Gu3WJGv0YZd80LHr5Un4 QeQEtH5NC5i1NyYD2NYpHM1bcIDTDVlqfZjPuJg+9fuF64UC4W4QcaxfTkmeIG6hQAoU0G ZCJ0gPXmkTf6ReTnG6ZiTOET01OeyJI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-98-H_xe-6JtPiCty6iROnStrQ-1; Tue, 07 Jun 2022 20:58:59 -0400 X-MC-Unique: H_xe-6JtPiCty6iROnStrQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 50D12800124; Wed, 8 Jun 2022 00:58:59 +0000 (UTC) Received: from localhost (ovpn-12-81.pek2.redhat.com [10.72.12.81]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 783F6492C3B; Wed, 8 Jun 2022 00:58:58 +0000 (UTC) Date: Wed, 8 Jun 2022 08:58:54 +0800 From: Baoquan He To: Pasha Tatashin Cc: sashal@kernel.org, ebiederm@xmission.com, rburanyi@google.com, akpm@linux-foundation.org, gthelen@google.com, viro@zeniv.linux.org.uk, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t Message-ID: References: <20220527025535.3953665-1-pasha.tatashin@soleen.com> <20220527025535.3953665-2-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220527025535.3953665-2-pasha.tatashin@soleen.com> X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220607_175906_229043_686674AD X-CRM114-Status: GOOD ( 21.76 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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 > > Signed-off-by: Pasha Tatashin > --- > 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 > > #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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8B3AC43334 for ; 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Tue, 07 Jun 2022 20:58:59 -0400 X-MC-Unique: H_xe-6JtPiCty6iROnStrQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 50D12800124; Wed, 8 Jun 2022 00:58:59 +0000 (UTC) Received: from localhost (ovpn-12-81.pek2.redhat.com [10.72.12.81]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 783F6492C3B; Wed, 8 Jun 2022 00:58:58 +0000 (UTC) Date: Wed, 8 Jun 2022 08:58:54 +0800 From: Baoquan He To: Pasha Tatashin Cc: sashal@kernel.org, ebiederm@xmission.com, rburanyi@google.com, akpm@linux-foundation.org, gthelen@google.com, viro@zeniv.linux.org.uk, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize_t Message-ID: References: <20220527025535.3953665-1-pasha.tatashin@soleen.com> <20220527025535.3953665-2-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220527025535.3953665-2-pasha.tatashin@soleen.com> X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > > Signed-off-by: Pasha Tatashin > --- > 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 > > #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 >