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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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14
arch/arc/kernel/traps.c
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@ -65,12 +65,14 @@ unhandled_exception(const char *str, struct pt_regs *regs, siginfo_t *info)
#define DO_ERROR_INFO(signr, str, name, sicode) \
int name(unsigned long address, struct pt_regs *regs) \
{ \
siginfo_t info = { \
.si_signo = signr, \
.si_errno = 0, \
.si_code = sicode, \
.si_addr = (void __user *)address, \
}; \
siginfo_t info; \
\
clear_siginfo(&info); \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = (void __user *)address; \
\
return unhandled_exception(str, regs, &info);\
}