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signal: Move addr_lsb into the _sigfault union for clarity

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The addr_lsb fields is only valid and available when the
signal is SIGBUS and the si_code is BUS_MCEERR_AR or BUS_MCEERR_AO.
Document this with a comment and place the field in the _sigfault union
to make this clear.

All of the fields stay in the same physical location so both the old
and new definitions of struct siginfo will continue to work.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2017-07-31 10:08:59 -05:00
parent b713da69e4
commit b68a68d3dc
2 changed files with 21 additions and 5 deletions
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12
include/linux/compat.h
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@ -221,15 +221,23 @@ typedef struct compat_siginfo {
#ifdef __ARCH_SI_TRAPNO
int _trapno; /* TRAP # which caused the signal */
#endif
short int _addr_lsb; /* Valid LSB of the reported address. */
union {
/*
* used when si_code=BUS_MCEERR_AR or
* used when si_code=BUS_MCEERR_AO
*/
short int _addr_lsb; /* Valid LSB of the reported address. */
/* used when si_code=SEGV_BNDERR */
struct {
short _dummy_bnd;
compat_uptr_t _lower;
compat_uptr_t _upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
u32 _pkey;
struct {
short _dummy_pkey;
u32 _pkey;
} _addr_pkey;
};
} _sigfault;