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signal: Ensure generic siginfos the kernel sends have all bits initialized

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Call clear_siginfo to ensure stack allocated siginfos are fully
initialized before being passed to the signal sending functions.

This ensures that if there is the kind of confusion documented by
TRAP_FIXME, FPE_FIXME, or BUS_FIXME the kernel won't send unitialized
data to userspace when the kernel generates a signal with SI_USER but
the copy to userspace assumes it is a different kind of signal, and
different fields are initialized.

This also prepares the way for turning copy_siginfo_to_user
into a copy_to_user, by removing the need in many cases to perform
a field by field copy simply to skip the uninitialized fields.

Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2018-01-05 17:27:42 -06:00
commit faf1f22b61
3 changed files with 10 additions and 1 deletions
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1
ipc/mqueue.c
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@ -639,6 +639,7 @@ static void __do_notify(struct mqueue_inode_info *info)
case SIGEV_SIGNAL:
/* sends signal */
clear_siginfo(&sig_i);
sig_i.si_signo = info->notify.sigev_signo;
sig_i.si_errno = 0;
sig_i.si_code = SI_MESGQ;