linux-kernel - [PATCH v2 1/3] powerpc/uaccess: get rid of small constant size cases in raw_copy_{to,from}

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <99d4ccb58a20d8408d0e19874393655ad5b40822.1612879284.git.christophe.leroy@csgroup.eu>
Date:   Tue,  9 Feb 2021 14:02:12 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 1/3] powerpc/uaccess: get rid of small constant size cases
 in raw_copy_{to,from}_user()

Copied from commit 4b842e4e25b1 ("x86: get rid of small
constant size cases in raw_copy_{to,from}_user()")

Very few call sites where that would be triggered remain, and none
of those is anywhere near hot enough to bother.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/uaccess.h | 41 ------------------------------
 1 file changed, 41 deletions(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 93d33f7e8b53..a4d2569173ac 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -398,26 +398,6 @@ static inline unsigned long raw_copy_from_user(void *to,
 		const void __user *from, unsigned long n)
 {
 	unsigned long ret;
-	if (__builtin_constant_p(n) && (n <= 8)) {
-		ret = 1;
-
-		switch (n) {
-		case 1:
-			__get_user_size(*(u8 *)to, from, 1, ret);
-			break;
-		case 2:
-			__get_user_size(*(u16 *)to, from, 2, ret);
-			break;
-		case 4:
-			__get_user_size(*(u32 *)to, from, 4, ret);
-			break;
-		case 8:
-			__get_user_size(*(u64 *)to, from, 8, ret);
-			break;
-		}
-		if (ret == 0)
-			return 0;
-	}
 
 	allow_read_from_user(from, n);
 	ret = __copy_tofrom_user((__force void __user *)to, from, n);
@@ -428,27 +408,6 @@ static inline unsigned long raw_copy_from_user(void *to,
 static inline unsigned long
 raw_copy_to_user_allowed(void __user *to, const void *from, unsigned long n)
 {
-	if (__builtin_constant_p(n) && (n <= 8)) {
-		unsigned long ret = 1;
-
-		switch (n) {
-		case 1:
-			__put_user_size_allowed(*(u8 *)from, (u8 __user *)to, 1, ret);
-			break;
-		case 2:
-			__put_user_size_allowed(*(u16 *)from, (u16 __user *)to, 2, ret);
-			break;
-		case 4:
-			__put_user_size_allowed(*(u32 *)from, (u32 __user *)to, 4, ret);
-			break;
-		case 8:
-			__put_user_size_allowed(*(u64 *)from, (u64 __user *)to, 8, ret);
-			break;
-		}
-		if (ret == 0)
-			return 0;
-	}
-
 	return __copy_tofrom_user(to, (__force const void __user *)from, n);
 }
 
-- 
2.25.0