[PATCH 3/8] signal: replace __copy_siginfo_to_user32 with to_compat_siginfo
From: Christoph Hellwig
Date: Tue Apr 14 2020 - 03:02:26 EST
Move copying the siginfo to userspace into the callers, so that the
compat_siginfo conversion can be reused by the ELF coredump code without
set_fs magic.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/x86/ia32/ia32_signal.c | 4 +-
arch/x86/kernel/signal.c | 5 ++-
include/linux/compat.h | 4 +-
kernel/signal.c | 89 ++++++++++++++++++-------------------
4 files changed, 52 insertions(+), 50 deletions(-)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 2bf188942d5c..0fbaed2562bc 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -301,6 +301,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
compat_sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe_ia32 __user *frame;
+ struct compat_siginfo new;
void __user *restorer;
void __user *fp = NULL;
@@ -350,7 +351,8 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
unsafe_put_user(*(__u64 *)set, (__u64 *)&frame->uc.uc_sigmask, Efault);
user_access_end();
- if (__copy_siginfo_to_user32(&frame->info, &ksig->info, SA_IA32_ABI))
+ to_compat_siginfo(&new, &ksig->info, SA_IA32_ABI);
+ if (copy_to_user(&frame->info, &new, sizeof(frame->info)))
return -EFAULT;
/* Set up registers for signal handler */
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index bbd451631790..6ff1265f071b 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -517,6 +517,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
{
#ifdef CONFIG_X86_X32_ABI
struct rt_sigframe_x32 __user *frame;
+ struct compat_siginfo new;
unsigned long uc_flags;
void __user *restorer;
void __user *fp = NULL;
@@ -543,8 +544,8 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
user_access_end();
if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
- if (__copy_siginfo_to_user32(&frame->info, &ksig->info,
- SA_X32_ABI))
+ to_compat_siginfo(&new, &ksig->info, SA_X32_ABI);
+ if (copy_to_user(&frame->info, &new, sizeof(frame->info)))
return -EFAULT;
}
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 14eec6116110..218ebba1e454 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -404,8 +404,8 @@ long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
unsigned long bitmap_size);
int copy_siginfo_from_user32(kernel_siginfo_t *to, const struct compat_siginfo __user *from);
int copy_siginfo_to_user32(struct compat_siginfo __user *to, const kernel_siginfo_t *from);
-int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
- const kernel_siginfo_t *from, unsigned int flags);
+void to_compat_siginfo(struct compat_siginfo *to,
+ const struct kernel_siginfo *from, unsigned int flags);
int get_compat_sigevent(struct sigevent *event,
const struct compat_sigevent __user *u_event);
diff --git a/kernel/signal.c b/kernel/signal.c
index 092fee008242..0f3e7fded3a5 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3235,88 +3235,82 @@ int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from)
}
#ifdef CONFIG_COMPAT
-int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
+void to_compat_siginfo(struct compat_siginfo *to,
const struct kernel_siginfo *from, unsigned int flags)
{
- struct compat_siginfo new;
- memset(&new, 0, sizeof(new));
+ memset(to, 0, sizeof(*to));
+ to->si_signo = from->si_signo;
+ to->si_errno = from->si_errno;
+ to->si_code = from->si_code;
- new.si_signo = from->si_signo;
- new.si_errno = from->si_errno;
- new.si_code = from->si_code;
- switch(siginfo_layout(from->si_signo, from->si_code)) {
+ switch (siginfo_layout(from->si_signo, from->si_code)) {
case SIL_KILL:
- new.si_pid = from->si_pid;
- new.si_uid = from->si_uid;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
break;
case SIL_TIMER:
- new.si_tid = from->si_tid;
- new.si_overrun = from->si_overrun;
- new.si_int = from->si_int;
+ to->si_tid = from->si_tid;
+ to->si_overrun = from->si_overrun;
+ to->si_int = from->si_int;
break;
case SIL_POLL:
- new.si_band = from->si_band;
- new.si_fd = from->si_fd;
+ to->si_band = from->si_band;
+ to->si_fd = from->si_fd;
break;
case SIL_FAULT:
- new.si_addr = ptr_to_compat(from->si_addr);
+ to->si_addr = ptr_to_compat(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- new.si_trapno = from->si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
break;
case SIL_FAULT_MCEERR:
- new.si_addr = ptr_to_compat(from->si_addr);
+ to->si_addr = ptr_to_compat(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- new.si_trapno = from->si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- new.si_addr_lsb = from->si_addr_lsb;
+ to->si_addr_lsb = from->si_addr_lsb;
break;
case SIL_FAULT_BNDERR:
- new.si_addr = ptr_to_compat(from->si_addr);
+ to->si_addr = ptr_to_compat(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- new.si_trapno = from->si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- new.si_lower = ptr_to_compat(from->si_lower);
- new.si_upper = ptr_to_compat(from->si_upper);
+ to->si_lower = ptr_to_compat(from->si_lower);
+ to->si_upper = ptr_to_compat(from->si_upper);
break;
case SIL_FAULT_PKUERR:
- new.si_addr = ptr_to_compat(from->si_addr);
+ to->si_addr = ptr_to_compat(from->si_addr);
#ifdef __ARCH_SI_TRAPNO
- new.si_trapno = from->si_trapno;
+ to->si_trapno = from->si_trapno;
#endif
- new.si_pkey = from->si_pkey;
+ to->si_pkey = from->si_pkey;
break;
case SIL_CHLD:
- new.si_pid = from->si_pid;
- new.si_uid = from->si_uid;
- new.si_status = from->si_status;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
+ to->si_status = from->si_status;
#ifdef CONFIG_X86_X32_ABI
if (flags & SA_X32_ABI) {
- new._sifields._sigchld_x32._utime = from->si_utime;
- new._sifields._sigchld_x32._stime = from->si_stime;
+ to->_sifields._sigchld_x32._utime = from->si_utime;
+ to->_sifields._sigchld_x32._stime = from->si_stime;
} else
#endif
{
- new.si_utime = from->si_utime;
- new.si_stime = from->si_stime;
+ to->si_utime = from->si_utime;
+ to->si_stime = from->si_stime;
}
break;
case SIL_RT:
- new.si_pid = from->si_pid;
- new.si_uid = from->si_uid;
- new.si_int = from->si_int;
+ to->si_pid = from->si_pid;
+ to->si_uid = from->si_uid;
+ to->si_int = from->si_int;
break;
case SIL_SYS:
- new.si_call_addr = ptr_to_compat(from->si_call_addr);
- new.si_syscall = from->si_syscall;
- new.si_arch = from->si_arch;
+ to->si_call_addr = ptr_to_compat(from->si_call_addr);
+ to->si_syscall = from->si_syscall;
+ to->si_arch = from->si_arch;
break;
}
-
- if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
- return -EFAULT;
-
- return 0;
}
#ifndef compat_siginfo_flags
@@ -3326,7 +3320,12 @@ int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
int copy_siginfo_to_user32(struct compat_siginfo __user *to,
const struct kernel_siginfo *from)
{
- return __copy_siginfo_to_user32(to, from, compat_siginfo_flags());
+ struct compat_siginfo new;
+
+ to_compat_siginfo(&new, from, compat_siginfo_flags());
+ if (copy_to_user(to, &new, sizeof(*to)))
+ return -EFAULT;
+ return 0;
}
static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
--
2.25.1