Date: Sat, 9 Jan 2016 17:27:36 +0000 (UTC) From: Dmitry Chagin <dchagin@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r293574 - stable/10/sys/compat/linprocfs Message-ID: <201601091727.u09HRa76058119@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
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);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201601091727.u09HRa76058119>