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signal: Correct the offset of si_pkey in struct siginfo

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The change moving addr_lsb into the _sigfault union failed to take
into account that _sigfault._addr_bnd._lower being a pointer forced
the entire union to have pointer alignment.  In practice this only
mattered for the offset of si_pkey which is why this has taken so long
to discover.

To correct this change _dummy_pkey and _dummy_bnd to have pointer type.

Reported-by: kernel test robot <shun.hao@intel.com>
Fixes: b68a68d3dc ("signal: Move addr_lsb into the _sigfault union for clarity")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-03-06 00:20:25 -06:00
parent 9026e820cb
commit 859d880cf5
2 changed files with 4 additions and 4 deletions
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4
include/linux/compat.h
View file

@ -229,13 +229,13 @@ typedef struct compat_siginfo {
short int _addr_lsb; /* Valid LSB of the reported address. */
/* used when si_code=SEGV_BNDERR */
struct {
short _dummy_bnd;
compat_uptr_t _dummy_bnd;
compat_uptr_t _lower;
compat_uptr_t _upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
struct {
short _dummy_pkey;
compat_uptr_t _dummy_pkey;
u32 _pkey;
} _addr_pkey;
};

4
include/uapi/asm-generic/siginfo.h
View file

@ -102,13 +102,13 @@ typedef struct siginfo {
short _addr_lsb; /* LSB of the reported address */
/* used when si_code=SEGV_BNDERR */
struct {
short _dummy_bnd;
void *_dummy_bnd;
void __user *_lower;
void __user *_upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
struct {
short _dummy_pkey;
void *_dummy_pkey;
__u32 _pkey;
} _addr_pkey;
};