mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
c0bfd26e13
copy_siginfo_to_user32() and copy_siginfo_from_user32() are used by both the 32-bit compat and x32 ABIs. Move them to signal_compat.c. Signed-off-by: Brian Gerst <brgerst@gmail.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1434974121-32575-2-git-send-email-brgerst@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
#include <linux/compat.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
|
|
{
|
|
int err = 0;
|
|
bool ia32 = test_thread_flag(TIF_IA32);
|
|
|
|
if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
|
|
return -EFAULT;
|
|
|
|
put_user_try {
|
|
/* If you change siginfo_t structure, please make sure that
|
|
this code is fixed accordingly.
|
|
It should never copy any pad contained in the structure
|
|
to avoid security leaks, but must copy the generic
|
|
3 ints plus the relevant union member. */
|
|
put_user_ex(from->si_signo, &to->si_signo);
|
|
put_user_ex(from->si_errno, &to->si_errno);
|
|
put_user_ex((short)from->si_code, &to->si_code);
|
|
|
|
if (from->si_code < 0) {
|
|
put_user_ex(from->si_pid, &to->si_pid);
|
|
put_user_ex(from->si_uid, &to->si_uid);
|
|
put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr);
|
|
} else {
|
|
/*
|
|
* First 32bits of unions are always present:
|
|
* si_pid === si_band === si_tid === si_addr(LS half)
|
|
*/
|
|
put_user_ex(from->_sifields._pad[0],
|
|
&to->_sifields._pad[0]);
|
|
switch (from->si_code >> 16) {
|
|
case __SI_FAULT >> 16:
|
|
break;
|
|
case __SI_SYS >> 16:
|
|
put_user_ex(from->si_syscall, &to->si_syscall);
|
|
put_user_ex(from->si_arch, &to->si_arch);
|
|
break;
|
|
case __SI_CHLD >> 16:
|
|
if (ia32) {
|
|
put_user_ex(from->si_utime, &to->si_utime);
|
|
put_user_ex(from->si_stime, &to->si_stime);
|
|
} else {
|
|
put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime);
|
|
put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime);
|
|
}
|
|
put_user_ex(from->si_status, &to->si_status);
|
|
/* FALL THROUGH */
|
|
default:
|
|
case __SI_KILL >> 16:
|
|
put_user_ex(from->si_uid, &to->si_uid);
|
|
break;
|
|
case __SI_POLL >> 16:
|
|
put_user_ex(from->si_fd, &to->si_fd);
|
|
break;
|
|
case __SI_TIMER >> 16:
|
|
put_user_ex(from->si_overrun, &to->si_overrun);
|
|
put_user_ex(ptr_to_compat(from->si_ptr),
|
|
&to->si_ptr);
|
|
break;
|
|
/* This is not generated by the kernel as of now. */
|
|
case __SI_RT >> 16:
|
|
case __SI_MESGQ >> 16:
|
|
put_user_ex(from->si_uid, &to->si_uid);
|
|
put_user_ex(from->si_int, &to->si_int);
|
|
break;
|
|
}
|
|
}
|
|
} put_user_catch(err);
|
|
|
|
return err;
|
|
}
|
|
|
|
int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
|
|
{
|
|
int err = 0;
|
|
u32 ptr32;
|
|
|
|
if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
|
|
return -EFAULT;
|
|
|
|
get_user_try {
|
|
get_user_ex(to->si_signo, &from->si_signo);
|
|
get_user_ex(to->si_errno, &from->si_errno);
|
|
get_user_ex(to->si_code, &from->si_code);
|
|
|
|
get_user_ex(to->si_pid, &from->si_pid);
|
|
get_user_ex(to->si_uid, &from->si_uid);
|
|
get_user_ex(ptr32, &from->si_ptr);
|
|
to->si_ptr = compat_ptr(ptr32);
|
|
} get_user_catch(err);
|
|
|
|
return err;
|
|
}
|