Afaict, the struct seccomp_data argument to secure_computing() is unused
by all current callers. So let's remove it.
The argument was added in [1]. It was added because having the arch
supply the syscall arguments used to be faster than having it done by
secure_computing() (cf. Andy's comment in [2]). This is not true anymore
though.
/* References */
[1]: 2f275de5d1ed ("seccomp: Add a seccomp_data parameter secure_computing()")
[2]: https://lore.kernel.org/r/CALCETrU_fs_At-hTpr231kpaAd0z7xJN4ku-DvzhRU6cvcJA_w@xxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Will Drewry <wad@xxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-parisc@xxxxxxxxxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: linux-um@xxxxxxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
---
/* v1 */
- Borislav Petkov <bp@xxxxxxxxx>:
- provide context for the arg addition to secure_computing() in the
commit message
/* v0 */
Link: https://lore.kernel.org/r/20190920131907.6886-1-christian.brauner@xxxxxxxxxx
---
arch/arm/kernel/ptrace.c | 2 +-
arch/arm64/kernel/ptrace.c | 2 +-
arch/parisc/kernel/ptrace.c | 2 +-
arch/s390/kernel/ptrace.c | 4 ++--
arch/um/kernel/skas/syscall.c | 2 +-
arch/x86/entry/vsyscall/vsyscall_64.c | 2 +-
include/linux/seccomp.h | 6 +++---
7 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 324352787aea..b606cded90cd 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -923,7 +923,7 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
/* Do seccomp after ptrace; syscall may have changed. */
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
return -1;
#else
/* XXX: remove this once OABI gets fixed */
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 3cf3b135027e..010a835302d3 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1816,7 +1816,7 @@ int syscall_trace_enter(struct pt_regs *regs)
}
/* Do the secure computing after ptrace; failures should be fast. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
return -1;
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index 9f6ff7bc06f9..f8c07dcbfb49 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -342,7 +342,7 @@ long do_syscall_trace_enter(struct pt_regs *regs)
}
/* Do the secure computing check after ptrace. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
return -1;
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index ad71132374f0..ed80bdfbf5fe 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -439,7 +439,7 @@ static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
- ptrace_area parea;
+ ptrace_area parea;
int copied, ret;
switch (request) {
@@ -856,7 +856,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
}
/* Do the secure computing check after ptrace. */
- if (secure_computing(NULL)) {
+ if (secure_computing()) {
/* seccomp failures shouldn't expose any additional code. */
return -1;
}
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index 44bb10785075..fc37259d5971 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -35,7 +35,7 @@ void handle_syscall(struct uml_pt_regs *r)
goto out;
/* Do the seccomp check after ptrace; failures should be fast. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
goto out;
syscall = UPT_SYSCALL_NR(r);
diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscall/vsyscall_64.c
index e7c596dea947..b10cbf71a8cc 100644
--- a/arch/x86/entry/vsyscall/vsyscall_64.c
+++ b/arch/x86/entry/vsyscall/vsyscall_64.c
@@ -222,7 +222,7 @@ bool emulate_vsyscall(unsigned long error_code,
*/
regs->orig_ax = syscall_nr;
regs->ax = -ENOSYS;
- tmp = secure_computing(NULL);
+ tmp = secure_computing();
if ((!tmp && regs->orig_ax != syscall_nr) || regs->ip != address) {
warn_bad_vsyscall(KERN_DEBUG, regs,
"seccomp tried to change syscall nr or ip");
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 84868d37b35d..03583b6d1416 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -33,10 +33,10 @@ struct seccomp {
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
extern int __secure_computing(const struct seccomp_data *sd);
-static inline int secure_computing(const struct seccomp_data *sd)
+static inline int secure_computing(void)
{
if (unlikely(test_thread_flag(TIF_SECCOMP)))
- return __secure_computing(sd);
+ return __secure_computing(NULL);
return 0;
}
#else
@@ -59,7 +59,7 @@ struct seccomp { };
struct seccomp_filter { };
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
-static inline int secure_computing(struct seccomp_data *sd) { return 0; }
+static inline int secure_computing(void) { return 0; }
#else
static inline void secure_computing_strict(int this_syscall) { return; }
#endif
--
2.23.0
