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Merge branch 'work.set_fs-exec' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull uaccess/coredump updates from Al Viro:
 "set_fs() removal in coredump-related area - mostly Christoph's
  stuff..."

* 'work.set_fs-exec' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  binfmt_elf_fdpic: remove the set_fs(KERNEL_DS) in elf_fdpic_core_dump
  binfmt_elf: remove the set_fs(KERNEL_DS) in elf_core_dump
  binfmt_elf: remove the set_fs in fill_siginfo_note
  signal: refactor copy_siginfo_to_user32
  powerpc/spufs: simplify spufs core dumping
  powerpc/spufs: stop using access_ok
  powerpc/spufs: fix copy_to_user while atomic
This commit is contained in:
Linus Torvalds
2020-06-01 16:21:46 -07:00
parent 062ea674ae 38cdabb7d8
commit 8b39a57e96
12 changed files with 296 additions and 323 deletions
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106
kernel/signal.c
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@@ -3235,94 +3235,94 @@ 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,
const struct kernel_siginfo *from)
#if defined(CONFIG_X86_X32_ABI) || defined(CONFIG_IA32_EMULATION)
/**
* copy_siginfo_to_external32 - copy a kernel siginfo into a compat user siginfo
* @to: compat siginfo destination
* @from: kernel siginfo source
*
* Note: This function does not work properly for the SIGCHLD on x32, but
* fortunately it doesn't have to. The only valid callers for this function are
* copy_siginfo_to_user32, which is overriden for x32 and the coredump code.
* The latter does not care because SIGCHLD will never cause a coredump.
*/
void copy_siginfo_to_external32(struct compat_siginfo *to,
const struct kernel_siginfo *from)
{
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;
memset(&new, 0, sizeof(new));
memset(to, 0, sizeof(*to));
new.si_signo = from->si_signo;
new.si_errno = from->si_errno;
new.si_code = from->si_code;
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = 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;
#ifdef CONFIG_X86_X32_ABI
if (x32_ABI) {
new._sifields._sigchld_x32._utime = from->si_utime;
new._sifields._sigchld_x32._stime = from->si_stime;
} else
#endif
{
new.si_utime = from->si_utime;
new.si_stime = from->si_stime;
}
to->si_pid = from->si_pid;
to->si_uid = from->si_uid;
to->si_status = from->si_status;
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;
}
}
int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
const struct kernel_siginfo *from)
{
struct compat_siginfo new;
copy_siginfo_to_external32(&new, from);
if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
return -EFAULT;
return 0;
}