Le 28/04/2020 à 21:56, Arnd Bergmann a écrit :
I think I found a way to improve the x32 handling:
This is a simplification over Christoph's "[PATCH 2/7] signal: factor
copy_siginfo_to_external32 from copy_siginfo_to_user32", reducing the
x32 specifics in the common code to a single #ifdef/#endif check, in
order to keep it more readable for everyone else.
Christoph, if you like it, please fold into your patch.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jeremy Kerr <jk@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/x86/include/asm/compat.h | 10 ++++++++++
arch/x86/kernel/signal.c | 23 +++++++++++++++++++++++
kernel/signal.c | 15 ++-------------
3 files changed, 35 insertions(+), 13 deletions(-)
[...]
diff --git a/kernel/signal.c b/kernel/signal.c
index 1a81602050b4..935facca4860 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3318,29 +3318,18 @@ void copy_siginfo_to_external32(struct compat_siginfo *to,
}
}
+#ifndef CONFIG_X86_X32_ABI
Can it be declared __weak instead of enclosing it in an #ifndef ?
int copy_siginfo_to_user32(struct compat_siginfo __user *to,
const struct kernel_siginfo *from)
-#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
-{
- return __copy_siginfo_to_user32(to, from, in_x32_syscall());
-}
-int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
- const struct kernel_siginfo *from, bool x32_ABI)
-#endif
{
struct compat_siginfo new;
copy_siginfo_to_external32(&new, from);
-#ifdef CONFIG_X86_X32_ABI
- if (x32_ABI && from->si_signo == SIGCHLD) {
- new._sifields._sigchld_x32._utime = from->si_utime;
- new._sifields._sigchld_x32._stime = from->si_stime;
- }
-#endif
if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
return -EFAULT;
return 0;
}
+#endif
static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
const struct compat_siginfo *from)
Christophe
