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signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE

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Rework the defintion of struct siginfo so that the array padding
struct siginfo to SI_MAX_SIZE can be placed in a union along side of
the rest of the struct siginfo members.  The result is that we no
longer need the __ARCH_SI_PREAMBLE_SIZE or SI_PAD_SIZE definitions.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2018-04-18 17:48:49 -05:00
parent e75dc036c4
commit f283801851
17 changed files with 94 additions and 202 deletions
Download Patch File Download Diff File Expand all files Collapse all files

177
include/uapi/asm-generic/siginfo.h
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@@ -10,18 +10,7 @@ typedef union sigval {
void __user *sival_ptr;
} sigval_t;
/*
* This is the size (including padding) of the part of the
* struct siginfo that is before the union.
*/
#ifndef __ARCH_SI_PREAMBLE_SIZE
#define __ARCH_SI_PREAMBLE_SIZE (3 * sizeof(int))
#endif
#define SI_MAX_SIZE 128
#ifndef SI_PAD_SIZE
#define SI_PAD_SIZE ((SI_MAX_SIZE - __ARCH_SI_PREAMBLE_SIZE) / sizeof(int))
#endif
/*
* The default "si_band" type is "long", as specified by POSIX.
@@ -40,96 +29,108 @@ typedef union sigval {
#define __ARCH_SI_ATTRIBUTES
#endif
typedef struct siginfo {
int si_signo;
#ifndef __ARCH_HAS_SWAPPED_SIGINFO
int si_errno;
int si_code;
#else
int si_code;
int si_errno;
#endif
union __sifields {
/* kill() */
struct {
__kernel_pid_t _pid; /* sender's pid */
__kernel_uid32_t _uid; /* sender's uid */
} _kill;
union {
int _pad[SI_PAD_SIZE];
/* POSIX.1b timers */
struct {
__kernel_timer_t _tid; /* timer id */
int _overrun; /* overrun count */
sigval_t _sigval; /* same as below */
int _sys_private; /* not to be passed to user */
} _timer;
/* kill() */
struct {
__kernel_pid_t _pid; /* sender's pid */
__kernel_uid32_t _uid; /* sender's uid */
} _kill;
/* POSIX.1b signals */
struct {
__kernel_pid_t _pid; /* sender's pid */
__kernel_uid32_t _uid; /* sender's uid */
sigval_t _sigval;
} _rt;
/* POSIX.1b timers */
struct {
__kernel_timer_t _tid; /* timer id */
int _overrun; /* overrun count */
sigval_t _sigval; /* same as below */
int _sys_private; /* not to be passed to user */
} _timer;
/* SIGCHLD */
struct {
__kernel_pid_t _pid; /* which child */
__kernel_uid32_t _uid; /* sender's uid */
int _status; /* exit code */
__ARCH_SI_CLOCK_T _utime;
__ARCH_SI_CLOCK_T _stime;
} _sigchld;
/* POSIX.1b signals */
struct {
__kernel_pid_t _pid; /* sender's pid */
__kernel_uid32_t _uid; /* sender's uid */
sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct {
__kernel_pid_t _pid; /* which child */
__kernel_uid32_t _uid; /* sender's uid */
int _status; /* exit code */
__ARCH_SI_CLOCK_T _utime;
__ARCH_SI_CLOCK_T _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
struct {
void __user *_addr; /* faulting insn/memory ref. */
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
struct {
void __user *_addr; /* faulting insn/memory ref. */
#ifdef __ARCH_SI_TRAPNO
int _trapno; /* TRAP # which caused the signal */
int _trapno; /* TRAP # which caused the signal */
#endif
#ifdef __ia64__
int _imm; /* immediate value for "break" */
unsigned int _flags; /* see ia64 si_flags */
unsigned long _isr; /* isr */
int _imm; /* immediate value for "break" */
unsigned int _flags; /* see ia64 si_flags */
unsigned long _isr; /* isr */
#endif
#define __ADDR_BND_PKEY_PAD (__alignof__(void *) < sizeof(short) ? \
sizeof(short) : __alignof__(void *))
union {
/*
* used when si_code=BUS_MCEERR_AR or
* used when si_code=BUS_MCEERR_AO
*/
short _addr_lsb; /* LSB of the reported address */
/* used when si_code=SEGV_BNDERR */
struct {
char _dummy_bnd[__ADDR_BND_PKEY_PAD];
void __user *_lower;
void __user *_upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
struct {
char _dummy_pkey[__ADDR_BND_PKEY_PAD];
__u32 _pkey;
} _addr_pkey;
};
} _sigfault;
union {
/*
* used when si_code=BUS_MCEERR_AR or
* used when si_code=BUS_MCEERR_AO
*/
short _addr_lsb; /* LSB of the reported address */
/* used when si_code=SEGV_BNDERR */
struct {
char _dummy_bnd[__ADDR_BND_PKEY_PAD];
void __user *_lower;
void __user *_upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
struct {
char _dummy_pkey[__ADDR_BND_PKEY_PAD];
__u32 _pkey;
} _addr_pkey;
};
} _sigfault;
/* SIGPOLL */
struct {
__ARCH_SI_BAND_T _band; /* POLL_IN, POLL_OUT, POLL_MSG */
int _fd;
} _sigpoll;
/* SIGPOLL */
struct {
__ARCH_SI_BAND_T _band; /* POLL_IN, POLL_OUT, POLL_MSG */
int _fd;
} _sigpoll;
/* SIGSYS */
struct {
void __user *_call_addr; /* calling user insn */
int _syscall; /* triggering system call number */
unsigned int _arch; /* AUDIT_ARCH_* of syscall */
} _sigsys;
} _sifields;
/* SIGSYS */
struct {
void __user *_call_addr; /* calling user insn */
int _syscall; /* triggering system call number */
unsigned int _arch; /* AUDIT_ARCH_* of syscall */
} _sigsys;
};
#ifndef __ARCH_HAS_SWAPPED_SIGINFO
#define __SIGINFO \
struct { \
int si_signo; \
int si_errno; \
int si_code; \
union __sifields _sifields; \
}
#else
#define __SIGINFO \
struct { \
int si_signo; \
int si_code; \
int si_errno; \
union __sifields _sifields; \
}
#endif /* __ARCH_HAS_SWAPPED_SIGINFO */
typedef struct siginfo {
union {
__SIGINFO;
int _si_pad[SI_MAX_SIZE/sizeof(int)];
};
} __ARCH_SI_ATTRIBUTES siginfo_t;
/*