linux-kernel - [PATCH 2/7] tools/nolibc: remove __nolibc_enosys() fallback from *at() functions

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

Message-Id: <20250821-nolibc-enosys-v1-2-4b63f2caaa89@weissschuh.net>
Date: Thu, 21 Aug 2025 17:40:33 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 2/7] tools/nolibc: remove __nolibc_enosys() fallback from
 *at() functions

All architectures have had one of the real functions available since
Linux 2.6.12. The additional fallback to __nolibc_enosys() is superfluous.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/include/nolibc/sys.h | 32 ++++++++------------------------
 1 file changed, 8 insertions(+), 24 deletions(-)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 4e5389edda03a61e76ad0377213e8ef0a621d300..2b9c3bf697e74e80016606814fe21929512ca007 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -142,10 +142,8 @@ int sys_chmod(const char *path, mode_t mode)
 {
 #if defined(__NR_fchmodat)
 	return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0);
-#elif defined(__NR_chmod)
-	return my_syscall2(__NR_chmod, path, mode);
 #else
-	return __nolibc_enosys(__func__, path, mode);
+	return my_syscall2(__NR_chmod, path, mode);
 #endif
 }
 
@@ -165,10 +163,8 @@ int sys_chown(const char *path, uid_t owner, gid_t group)
 {
 #if defined(__NR_fchownat)
 	return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0);
-#elif defined(__NR_chown)
-	return my_syscall3(__NR_chown, path, owner, group);
 #else
-	return __nolibc_enosys(__func__, path, owner, group);
+	return my_syscall3(__NR_chown, path, owner, group);
 #endif
 }
 
@@ -569,10 +565,8 @@ int sys_link(const char *old, const char *new)
 {
 #if defined(__NR_linkat)
 	return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0);
-#elif defined(__NR_link)
-	return my_syscall2(__NR_link, old, new);
 #else
-	return __nolibc_enosys(__func__, old, new);
+	return my_syscall2(__NR_link, old, new);
 #endif
 }
 
@@ -640,10 +634,8 @@ int sys_mkdir(const char *path, mode_t mode)
 {
 #if defined(__NR_mkdirat)
 	return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode);
-#elif defined(__NR_mkdir)
-	return my_syscall2(__NR_mkdir, path, mode);
 #else
-	return __nolibc_enosys(__func__, path, mode);
+	return my_syscall2(__NR_mkdir, path, mode);
 #endif
 }
 
@@ -662,10 +654,8 @@ int sys_rmdir(const char *path)
 {
 #if defined(__NR_rmdir)
 	return my_syscall1(__NR_rmdir, path);
-#elif defined(__NR_unlinkat)
-	return my_syscall3(__NR_unlinkat, AT_FDCWD, path, AT_REMOVEDIR);
 #else
-	return __nolibc_enosys(__func__, path);
+	return my_syscall3(__NR_unlinkat, AT_FDCWD, path, AT_REMOVEDIR);
 #endif
 }
 
@@ -685,10 +675,8 @@ long sys_mknod(const char *path, mode_t mode, dev_t dev)
 {
 #if defined(__NR_mknodat)
 	return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev);
-#elif defined(__NR_mknod)
-	return my_syscall3(__NR_mknod, path, mode, dev);
 #else
-	return __nolibc_enosys(__func__, path, mode, dev);
+	return my_syscall3(__NR_mknod, path, mode, dev);
 #endif
 }
 
@@ -872,10 +860,8 @@ int sys_symlink(const char *old, const char *new)
 {
 #if defined(__NR_symlinkat)
 	return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new);
-#elif defined(__NR_symlink)
-	return my_syscall2(__NR_symlink, old, new);
 #else
-	return __nolibc_enosys(__func__, old, new);
+	return my_syscall2(__NR_symlink, old, new);
 #endif
 }
 
@@ -929,10 +915,8 @@ int sys_unlink(const char *path)
 {
 #if defined(__NR_unlinkat)
 	return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0);
-#elif defined(__NR_unlink)
-	return my_syscall1(__NR_unlink, path);
 #else
-	return __nolibc_enosys(__func__, path);
+	return my_syscall1(__NR_unlink, path);
 #endif
 }
 

-- 
2.50.1