From: David Disseldorp <ddiss@suse.de>
To: linux-fsdevel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org,
	Al Viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <brauner@kernel.org>,
	David Disseldorp <ddiss@suse.de>
Subject: [PATCH v4 3/8] vsprintf: add simple_strntoul
Date: Tue,  4 Mar 2025 16:57:46 +1100	[thread overview]
Message-ID: <20250304061020.9815-4-ddiss@suse.de> (raw)
In-Reply-To: <20250304061020.9815-1-ddiss@suse.de>

cpio extraction currently does a memcpy to ensure that the archive hex
fields are null terminated for simple_strtoul(). simple_strntoul() will
allow us to avoid the memcpy.

Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 include/linux/kstrtox.h | 1 +
 lib/vsprintf.c          | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/kstrtox.h b/include/linux/kstrtox.h
index 7fcf29a4e0de4..6ea897222af1d 100644
--- a/include/linux/kstrtox.h
+++ b/include/linux/kstrtox.h
@@ -143,6 +143,7 @@ static inline int __must_check kstrtos32_from_user(const char __user *s, size_t
  */
 
 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
+extern unsigned long simple_strntoul(const char *,char **,unsigned int,size_t);
 extern long simple_strtol(const char *,char **,unsigned int);
 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
 extern long long simple_strtoll(const char *,char **,unsigned int);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 56fe963192926..734bd70c8b9b3 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -114,6 +114,13 @@ unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
 }
 EXPORT_SYMBOL(simple_strtoul);
 
+unsigned long simple_strntoul(const char *cp, char **endp, unsigned int base,
+			      size_t max_chars)
+{
+	return simple_strntoull(cp, endp, base, max_chars);
+}
+EXPORT_SYMBOL(simple_strntoul);
+
 /**
  * simple_strtol - convert a string to a signed long
  * @cp: The start of the string
-- 
2.43.0

next prev parent reply	other threads:[~2025-03-04  6:10 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-04  5:57 [PATCH v4 0/8] initramfs: kunit tests and cleanups David Disseldorp
2025-03-04  5:57 ` [PATCH v4 1/8] init: add initramfs_internal.h David Disseldorp
2025-03-04  5:57 ` [PATCH v4 2/8] initramfs_test: kunit tests for initramfs unpacking David Disseldorp
2025-03-04  5:57 ` David Disseldorp [this message]
2025-03-04  5:57 ` [PATCH v4 4/8] initramfs: avoid memcpy for hex header fields David Disseldorp
2025-03-04  5:57 ` [PATCH v4 5/8] initramfs: allocate heap buffers together David Disseldorp
2025-03-04  5:57 ` [PATCH v4 6/8] initramfs: reuse name_len for dir mtime tracking David Disseldorp
2025-03-04  5:57 ` [PATCH v4 7/8] initramfs: fix hardlink hash leak without TRAILER David Disseldorp
2025-03-04  5:57 ` [PATCH v4 8/8] initramfs: avoid static buffer for error message David Disseldorp
2025-03-04  8:54 ` [PATCH v4 0/8] initramfs: kunit tests and cleanups Christian Brauner
2025-03-05 13:09   ` [PATCH] initramfs_test: flag kunit_case __refdata to suppress warning David Disseldorp
2025-03-06  7:13     ` Christian Brauner

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