linux-kernel - [PATCH v2 11/11] um: switch ptrace FP register access to nolibc

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: <20250919153420.727385-12-benjamin@sipsolutions.net>
Date: Fri, 19 Sep 2025 17:34:20 +0200
From: Benjamin Berg <benjamin@...solutions.net>
To: linux-um@...ts.infradead.org,
	Willy Tarreau <w@....eu>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	linux-kselftest@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Benjamin Berg <benjamin.berg@...el.com>
Subject: [PATCH v2 11/11] um: switch ptrace FP register access to nolibc

From: Benjamin Berg <benjamin.berg@...el.com>

The registers.c file only contains the routines for floating point
register access in ptrace mode and initial size detection. After the
addition of sys/uio.h and sys/ptrace.h to nolibc it can be moved to use
it by using the sys_ptrace() wrapper.

Signed-off-by: Benjamin Berg <benjamin.berg@...el.com>

---
v2:
- Use new sys_ptrace from nolibc
---
 arch/x86/um/os-Linux/Makefile    |  5 ++++-
 arch/x86/um/os-Linux/registers.c | 16 ++++------------
 2 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/arch/x86/um/os-Linux/Makefile b/arch/x86/um/os-Linux/Makefile
index 77a308aaa5ec..d37320430822 100644
--- a/arch/x86/um/os-Linux/Makefile
+++ b/arch/x86/um/os-Linux/Makefile
@@ -3,10 +3,13 @@
 # Licensed under the GPL
 #
 
-obj-y = registers.o mcontext.o
+obj-y = mcontext.o
 
 obj-$(CONFIG_X86_32) += tls.o
 
 USER_OBJS := $(obj-y)
 
+obj-y += registers.o
+NOLIBC_OBJS := registers.o
+
 include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/x86/um/os-Linux/registers.c b/arch/x86/um/os-Linux/registers.c
index eb1cdadc8a61..e570e29c3d73 100644
--- a/arch/x86/um/os-Linux/registers.c
+++ b/arch/x86/um/os-Linux/registers.c
@@ -28,9 +28,7 @@ int get_fp_registers(int pid, unsigned long *regs)
 		.iov_len = host_fp_size,
 	};
 
-	if (ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov) < 0)
-		return -errno;
-	return 0;
+	return sys_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
 }
 
 int put_fp_registers(int pid, unsigned long *regs)
@@ -40,9 +38,7 @@ int put_fp_registers(int pid, unsigned long *regs)
 		.iov_len = host_fp_size,
 	};
 
-	if (ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov) < 0)
-		return -errno;
-	return 0;
+	return sys_ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov);
 }
 
 int arch_init_registers(int pid)
@@ -60,9 +56,7 @@ int arch_init_registers(int pid)
 
 	/* GDB has x86_xsave_length, which uses x86_cpuid_count */
 	ptrace_regset = NT_X86_XSTATE;
-	ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
-	if (ret)
-		ret = -errno;
+	ret = sys_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
 
 	if (ret == -ENODEV) {
 #ifdef CONFIG_X86_32
@@ -71,9 +65,7 @@ int arch_init_registers(int pid)
 		ptrace_regset = NT_PRFPREG;
 #endif
 		iov.iov_len = 2 * 1024 * 1024;
-		ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
-		if (ret)
-			ret = -errno;
+		ret = sys_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
 	}
 
 	munmap(iov.iov_base, 2 * 1024 * 1024);
-- 
2.51.0