This fix two related bugs:
* PTRACE_GETREGS doesn't get the right orig_ax (syscall) value
* PTRACE_SETREGS can't set the orig_ax value (erased by initial value)
Remove the now useless and error-prone get_syscall().
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Will Drewry <wad@xxxxxxxxxxxx>
Cc: Thomas Meyer <thomas@xxxxxxxx>
Cc: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
Cc: Anton Ivanov <aivanov@xxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: user-mode-linux-user@xxxxxxxxxxxxxxxxxxxxx
Cc: Meredydd Luff <meredydd@xxxxxxxxxxxxxxx>
Cc: David Drysdale <drysdale@xxxxxxxxxx>
---
arch/um/kernel/skas/syscall.c | 7 ++++++-
arch/um/os-Linux/skas/process.c | 7 -------
2 files changed, 6 insertions(+), 8 deletions(-)
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index 1683b8e..65f0d1a 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -7,6 +7,7 @@
#include <linux/ptrace.h>
#include <kern_util.h>
#include <sysdep/ptrace.h>
+#include <sysdep/ptrace_user.h>
#include <sysdep/syscalls.h>
#include <os.h>
@@ -16,12 +17,16 @@ void handle_syscall(struct uml_pt_regs *r)
long result;
int syscall;
+ /* Save the syscall register. */
+ UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
+
if (syscall_trace_enter(regs)) {
result = -ENOSYS;
goto out;
}
- syscall = get_syscall(r);
+ /* Get the syscall after being potentially updated with ptrace. */
+ syscall = UPT_SYSCALL_NR(r);
if ((syscall > __NR_syscall_max) || syscall < 0)
result = -ENOSYS;
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index b856c66..23025d6 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -172,13 +172,6 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
handle_syscall(regs);
}
-int get_syscall(struct uml_pt_regs *regs)
-{
- UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
-
- return UPT_SYSCALL_NR(regs);
-}
-
extern char __syscall_stub_start[];
static int userspace_tramp(void *stack)
--
2.6.4
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