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signal: Don't use structure initializers for struct siginfo

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The siginfo structure has all manners of holes with the result that a
structure initializer is not guaranteed to initialize all of the bits.
As we have to copy the structure to userspace don't even try to use
a structure initializer.  Instead use clear_siginfo followed by initializing
selected fields.  This gives a guarantee that uninitialized kernel memory
is not copied to userspace.

Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2018-01-22 14:58:57 -06:00
commit 5f74972ce6
9 changed files with 89 additions and 60 deletions
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3
arch/m68k/mm/fault.c
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@ -21,8 +21,9 @@ extern void die_if_kernel(char *, struct pt_regs *, long);
int send_fault_sig(struct pt_regs *regs)
{
siginfo_t siginfo = { 0, 0, 0, };
siginfo_t siginfo;
clear_siginfo(&siginfo);
siginfo.si_signo = current->thread.signo;
siginfo.si_code = current->thread.code;
siginfo.si_addr = (void *)current->thread.faddr;