Author: kib
Date: Tue Nov 26 19:47:09 2013
New Revision: 258661
URL: http://svnweb.freebsd.org/changeset/base/258661
Log:
Add an kinfo sysctl to retrieve signal trampoline location for the
given process.
Note that the correctness of the trampoline length returned for ABIs
which do not use shared page depends on the correctness of the struct
sysvec sv_szsigcodebase member, which will be fixed on as-need basis.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/compat/freebsd32/freebsd32.h
head/sys/kern/kern_proc.c
head/sys/sys/sysctl.h
head/sys/sys/user.h
Modified: head/sys/compat/freebsd32/freebsd32.h
==============================================================================
--- head/sys/compat/freebsd32/freebsd32.h Tue Nov 26 19:38:42 2013
(r258660)
+++ head/sys/compat/freebsd32/freebsd32.h Tue Nov 26 19:47:09 2013
(r258661)
@@ -362,6 +362,12 @@ struct kinfo_proc32 {
int ki_tdflags;
};
+struct kinfo_sigtramp32 {
+ uint32_t ksigtramp_start;
+ uint32_t ksigtramp_end;
+ uint32_t ksigtramp_spare[4];
+};
+
struct kld32_file_stat_1 {
int version; /* set to sizeof(struct kld_file_stat_1) */
char name[MAXPATHLEN];
Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c Tue Nov 26 19:38:42 2013 (r258660)
+++ head/sys/kern/kern_proc.c Tue Nov 26 19:47:09 2013 (r258661)
@@ -2631,6 +2631,60 @@ errout:
return (error);
}
+static int
+sysctl_kern_proc_sigtramp(SYSCTL_HANDLER_ARGS)
+{
+ int *name = (int *)arg1;
+ u_int namelen = arg2;
+ struct proc *p;
+ struct kinfo_sigtramp kst;
+ const struct sysentvec *sv;
+ int error;
+#ifdef COMPAT_FREEBSD32
+ struct kinfo_sigtramp32 kst32;
+#endif
+
+ if (namelen != 1)
+ return (EINVAL);
+
+ error = pget((pid_t)name[0], PGET_CANDEBUG, &p);
+ if (error != 0)
+ return (error);
+ sv = p->p_sysent;
+#ifdef COMPAT_FREEBSD32
+ if ((req->flags & SCTL_MASK32) != 0) {
+ bzero(&kst32, sizeof(kst32));
+ if (SV_PROC_FLAG(p, SV_ILP32)) {
+ if (sv->sv_sigcode_base != 0) {
+ kst32.ksigtramp_start = sv->sv_sigcode_base;
+ kst32.ksigtramp_end = sv->sv_sigcode_base +
+ *sv->sv_szsigcode;
+ } else {
+ kst32.ksigtramp_start = sv->sv_psstrings -
+ *sv->sv_szsigcode;
+ kst32.ksigtramp_end = sv->sv_psstrings;
+ }
+ }
+ PROC_UNLOCK(p);
+ error = SYSCTL_OUT(req, &kst32, sizeof(kst32));
+ return (error);
+ }
+#endif
+ bzero(&kst, sizeof(kst));
+ if (sv->sv_sigcode_base != 0) {
+ kst.ksigtramp_start = (char *)sv->sv_sigcode_base;
+ kst.ksigtramp_end = (char *)sv->sv_sigcode_base +
+ *sv->sv_szsigcode;
+ } else {
+ kst.ksigtramp_start = (char *)sv->sv_psstrings -
+ *sv->sv_szsigcode;
+ kst.ksigtramp_end = (char *)sv->sv_psstrings;
+ }
+ PROC_UNLOCK(p);
+ error = SYSCTL_OUT(req, &kst, sizeof(kst));
+ return (error);
+}
+
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
@@ -2739,3 +2793,7 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC
static SYSCTL_NODE(_kern_proc, KERN_PROC_OSREL, osrel, CTLFLAG_RW |
CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_osrel,
"Process binary osreldate");
+
+static SYSCTL_NODE(_kern_proc, KERN_PROC_SIGTRAMP, sigtramp, CTLFLAG_RD |
+ CTLFLAG_MPSAFE, sysctl_kern_proc_sigtramp,
+ "Process signal trampoline location");
Modified: head/sys/sys/sysctl.h
==============================================================================
--- head/sys/sys/sysctl.h Tue Nov 26 19:38:42 2013 (r258660)
+++ head/sys/sys/sysctl.h Tue Nov 26 19:47:09 2013 (r258661)
@@ -530,6 +530,7 @@ SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a
#define KERN_PROC_PS_STRINGS 38 /* get ps_strings location */
#define KERN_PROC_UMASK 39 /* process umask */
#define KERN_PROC_OSREL 40 /* osreldate for process binary
*/
+#define KERN_PROC_SIGTRAMP 41 /* signal trampoline location */
/*
* KERN_IPC identifiers
Modified: head/sys/sys/user.h
==============================================================================
--- head/sys/sys/user.h Tue Nov 26 19:38:42 2013 (r258660)
+++ head/sys/sys/user.h Tue Nov 26 19:47:09 2013 (r258661)
@@ -498,6 +498,12 @@ struct kinfo_kstack {
int _kkst_ispare[16]; /* Space for more stuff. */
};
+struct kinfo_sigtramp {
+ void *ksigtramp_start;
+ void *ksigtramp_end;
+ void *ksigtramp_spare[4];
+};
+
#ifdef _KERNEL
/* Flags for kern_proc_out function. */
#define KERN_PROC_NOTHREADS 0x1
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