Re: [PATCH v2 16/15] syscall_get_arch: add "struct task_struct *" argument
Hi Dmitry,
On Wed, Nov 21, 2018 at 03:44:22AM +0300, Dmitry V. Levin wrote:
This argument is required to extend the generic ptrace API
with PTRACE_GET_SYSCALL_INFO request: syscall_get_arch() is going to be
called from ptrace_request() along with other syscall_get_* functions
with a tracee as their argument.
This change partially reverts commit 5e937a9ae913 ("syscall_get_arch:
remove useless function arguments").
%
diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 0170602a1e4e..52b633f20abd 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -73,7 +73,7 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
#ifdef CONFIG_64BIT
case 4: case 5: case 6: case 7:
#ifdef CONFIG_MIPS32_O32
- if (test_thread_flag(TIF_32BIT_REGS))
+ if (test_ti_thread_flag(task_thread_info(task), TIF_32BIT_REGS))
return get_user(*arg, (int *)usp + n);
else
#endif
This ought to be test_tsk_thread_flag(task, TIF_32BIT_REGS) instead of
open-coding test_tsk_thread_flag.
More fundamentally though, this change doesn't seem to be (directly)
related to the change you describe in the commit message - it's not
syscall_get_arch being modified here. I suspect this should be a
separate commit, or if not please explain in the commit message why this
change is included.
Compounding the lack of clarity is the fact that I only received this
patch, not the whole series, so I can't view the change in the context
of the rest of the series.
@@ -140,14 +140,14 @@ extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];
-static inline int syscall_get_arch(void)
+static inline int syscall_get_arch(struct task_struct *task)
{
int arch = AUDIT_ARCH_MIPS;
#ifdef CONFIG_64BIT
- if (!test_thread_flag(TIF_32BIT_REGS)) {
+ if (!test_ti_thread_flag(task_thread_info(task), TIF_32BIT_REGS)) {
arch |= __AUDIT_ARCH_64BIT;
/* N32 sets only TIF_32BIT_ADDR */
- if (test_thread_flag(TIF_32BIT_ADDR))
+ if (test_ti_thread_flag(task_thread_info(task), TIF_32BIT_ADDR))
arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
}
#endif
This does seem like the described change, but there are 2 more instances
of open-coding test_tsk_thread_flag which ought to be cleaned up.
Thanks,
Paul