svn commit: r293574 - stable/10/sys/compat/linprocfs
Dmitry Chagin
dchagin at FreeBSD.org
Sat Jan 9 17:27:37 UTC 2016
Author: dchagin
Date: Sat Jan 9 17:27:36 2016
New Revision: 293574
URL: https://svnweb.freebsd.org/changeset/base/293574
Log:
MFC r283473:
Add support for /proc/<pid>/auxv.
Modified:
stable/10/sys/compat/linprocfs/linprocfs.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/compat/linprocfs/linprocfs.c
==============================================================================
--- stable/10/sys/compat/linprocfs/linprocfs.c Sat Jan 9 17:23:57 2016 (r293573)
+++ stable/10/sys/compat/linprocfs/linprocfs.c Sat Jan 9 17:27:36 2016 (r293574)
@@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
+#include <sys/systm.h>
#include <sys/blist.h>
#include <sys/conf.h>
#include <sys/exec.h>
@@ -51,6 +52,7 @@ __FBSDID("$FreeBSD$");
#include <sys/filedesc.h>
#include <sys/jail.h>
#include <sys/kernel.h>
+#include <sys/limits.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
@@ -1364,6 +1366,52 @@ linprocfs_douuid(PFS_FILL_ARGS)
return(0);
}
+/*
+ * Filler function for proc/pid/auxv
+ */
+static int
+linprocfs_doauxv(PFS_FILL_ARGS)
+{
+ struct sbuf *asb;
+ off_t buflen, resid;
+ int error;
+
+ /*
+ * Mimic linux behavior and pass only processes with usermode
+ * address space as valid. Return zero silently otherwise.
+ */
+ if (p->p_vmspace == &vmspace0)
+ return (0);
+
+ if (uio->uio_resid == 0)
+ return (0);
+ if (uio->uio_offset < 0 || uio->uio_resid < 0)
+ return (EINVAL);
+
+ asb = sbuf_new_auto();
+ if (asb == NULL)
+ return (ENOMEM);
+ error = proc_getauxv(td, p, asb);
+ if (error == 0)
+ error = sbuf_finish(asb);
+
+ resid = sbuf_len(asb) - uio->uio_offset;
+ if (resid > uio->uio_resid)
+ buflen = uio->uio_resid;
+ else
+ buflen = resid;
+ if (buflen > IOSIZE_MAX)
+ return (EINVAL);
+ if (buflen > MAXPHYS)
+ buflen = MAXPHYS;
+ if (resid <= 0)
+ return (0);
+
+ if (error == 0)
+ error = uiomove(sbuf_data(asb) + uio->uio_offset, buflen, uio);
+ sbuf_delete(asb);
+ return (error);
+}
/*
* Constructor
@@ -1439,6 +1487,8 @@ linprocfs_init(PFS_INIT_ARGS)
NULL, NULL, NULL, PFS_RD);
pfs_create_link(dir, "fd", &linprocfs_dofdescfs,
NULL, NULL, NULL, 0);
+ pfs_create_file(dir, "auxv", &linprocfs_doauxv,
+ NULL, &procfs_candebug, NULL, PFS_RD|PFS_RAWRD);
/* /proc/scsi/... */
dir = pfs_create_dir(root, "scsi", NULL, NULL, NULL, 0);
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