vfs: define struct filename and have getname() return it

getname() is intended to copy pathname strings from userspace into a
kernel buffer. The result is just a string in kernel space. It would
however be quite helpful to be able to attach some ancillary info to
the string.

For instance, we could attach some audit-related info to reduce the
amount of audit-related processing needed. When auditing is enabled,
we could also call getname() on the string more than once and not
need to recopy it from userspace.

This patchset converts the getname()/putname() interfaces to return
a struct instead of a string. For now, the struct just tracks the
string in kernel space and the original userland pointer for it.

Later, we'll add other information to the struct as it becomes
convenient.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 6 insertions, 6 deletions

diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 14006d8..487bffb 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -482,7 +482,7 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 asmlinkage int sparc_execve(struct pt_regs *regs)
 {
 	int error, base = 0;
-	char *filename;
+	struct filename *filename;
 
 	/* Check for indirect call. */
 	if(regs->u_regs[UREG_G1] == 0)
@@ -492,7 +492,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
 	error = PTR_ERR(filename);
 	if(IS_ERR(filename))
 		goto out;
-	error = do_execve(filename,
+	error = do_execve(filename->name,
 			  (const char __user *const  __user *)
 			  regs->u_regs[base + UREG_I1],
 			  (const char __user *const  __user *)
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index aff0c72..fcaa594 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -722,7 +722,7 @@ EXPORT_SYMBOL(dump_fpu);
 asmlinkage int sparc_execve(struct pt_regs *regs)
 {
 	int error, base = 0;
-	char *filename;
+	struct filename *filename;
 
 	/* User register window flush is done by entry.S */
 
@@ -734,7 +734,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
-	error = do_execve(filename,
+	error = do_execve(filename->name,
 			  (const char __user *const __user *)
 			  regs->u_regs[base + UREG_I1],
 			  (const char __user *const __user *)
diff --git a/arch/sparc/kernel/sys_sparc32.c b/arch/sparc/kernel/sys_sparc32.c
index d862499..c323981 100644
--- a/arch/sparc/kernel/sys_sparc32.c
+++ b/arch/sparc/kernel/sys_sparc32.c
@@ -403,7 +403,7 @@ asmlinkage long compat_sys_rt_sigaction(int sig,
 asmlinkage long sparc32_execve(struct pt_regs *regs)
 {
 	int error, base = 0;
-	char *filename;
+	struct filename *filename;
 
 	/* User register window flush is done by entry.S */
 
@@ -416,7 +416,7 @@ asmlinkage long sparc32_execve(struct pt_regs *regs)
 	if (IS_ERR(filename))
 		goto out;
 
-	error = compat_do_execve(filename,
+	error = compat_do_execve(filename->name,
 				 compat_ptr(regs->u_regs[base + UREG_I1]),
 				 compat_ptr(regs->u_regs[base + UREG_I2]), regs);