From b1fb57da3d6797691506bb9954d166bb2bd56555 Mon Sep 17 00:00:00 2001 From: nobu Date: Sat, 8 Mar 2014 03:55:01 +0000 Subject: process.c: tmp buffer instead of alloca * process.c (OBJ2UID1, OBJ2GID1): separate from OBJ2UID and OBJ2GID respectively, need given buffers. * process.c (OBJ2UID, OBJ2GID): no longer need PREPARE_GETPWNAM and PREPARE_GETGRNAM. * process.c (obj2uid, obj2gid): use tmp buffer instead of alloca to get rid of potential stack overflow. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45287 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- process.c | 115 +++++++++++++++++++++++++++++++++++++++++++------------------- 1 file changed, 81 insertions(+), 34 deletions(-) (limited to 'process.c') diff --git a/process.c b/process.c index 79001e20c0..0f3c6a2313 100644 --- a/process.c +++ b/process.c @@ -154,17 +154,30 @@ static void check_gid_switch(void); # endif # ifdef USE_GETPWNAM_R # define PREPARE_GETPWNAM \ - long getpw_buf_len = sysconf(_SC_GETPW_R_SIZE_MAX); \ - char *getpw_buf = ALLOCA_N(char, (getpw_buf_len < 0 ? (getpw_buf_len = 4096) : getpw_buf_len)); -# define OBJ2UID(id) obj2uid((id), getpw_buf, getpw_buf_len) -static rb_uid_t obj2uid(VALUE id, char *getpw_buf, size_t getpw_buf_len); + VALUE getpw_buf = 0 +# define FINISH_GETPWNAM \ + ALLOCV_END(getpw_buf) +# define OBJ2UID1(id) obj2uid((id), &getpw_buf) +# define OBJ2UID(id) obj2uid0(id) +static rb_uid_t obj2uid(VALUE id, VALUE *getpw_buf); +static inline rb_uid_t +obj2uid0(VALUE id) +{ + rb_uid_t uid; + PREPARE_GETPWNAM; + uid = OBJ2UID1(id); + FINISH_GETPWNAM; + return uid; +} # else # define PREPARE_GETPWNAM /* do nothing */ +# define FINISH_GETPWNAM /* do nothing */ # define OBJ2UID(id) obj2uid((id)) static rb_uid_t obj2uid(VALUE id); # endif #else # define PREPARE_GETPWNAM /* do nothing */ +# define FINISH_GETPWNAM /* do nothing */ # define OBJ2UID(id) NUM2UIDT(id) # ifdef p_uid_from_name # undef p_uid_from_name @@ -178,17 +191,31 @@ static rb_uid_t obj2uid(VALUE id); # endif # ifdef USE_GETGRNAM_R # define PREPARE_GETGRNAM \ - long getgr_buf_len = sysconf(_SC_GETGR_R_SIZE_MAX); \ - char *getgr_buf = ALLOCA_N(char, (getgr_buf_len < 0 ? (getgr_buf_len = 4096) : getgr_buf_len)); -# define OBJ2GID(id) obj2gid((id), getgr_buf, getgr_buf_len) -static rb_gid_t obj2gid(VALUE id, char *getgr_buf, size_t getgr_buf_len); + VALUE getgr_buf = 0 +# define FINISH_GETGRNAM \ + ALLOCV_END(getgr_buf) +# define OBJ2GID1(id) obj2gid((id), &getgr_buf) +# define OBJ2GID(id) obj2gid0(id) +static rb_gid_t obj2gid(VALUE id, VALUE *getgr_buf); +static inline rb_gid_t +obj2gid0(VALUE id) +{ + rb_gid_t gid; + PREPARE_GETGRNAM; + gid = OBJ2GID1(id); + FINISH_GETGRNAM; + return gid; +} +static rb_gid_t obj2gid(VALUE id, VALUE *getgr_buf); # else # define PREPARE_GETGRNAM /* do nothing */ +# define FINISH_GETGRNAM /* do nothing */ # define OBJ2GID(id) obj2gid((id)) static rb_gid_t obj2gid(VALUE id); # endif #else # define PREPARE_GETGRNAM /* do nothing */ +# define FINISH_GETGRNAM /* do nothing */ # define OBJ2GID(id) NUM2GIDT(id) # ifdef p_gid_from_name # undef p_gid_from_name @@ -1703,7 +1730,6 @@ rb_execarg_addopt(VALUE execarg_obj, VALUE key, VALUE val) } check_uid_switch(); { - PREPARE_GETPWNAM; eargp->uid = OBJ2UID(val); eargp->uid_given = 1; } @@ -1719,7 +1745,6 @@ rb_execarg_addopt(VALUE execarg_obj, VALUE key, VALUE val) } check_gid_switch(); { - PREPARE_GETGRNAM; eargp->gid = OBJ2GID(val); eargp->gid_given = 1; } @@ -4686,7 +4711,7 @@ check_gid_switch(void) static rb_uid_t obj2uid(VALUE id # ifdef USE_GETPWNAM_R - , char *getpw_buf, size_t getpw_buf_len + , VALUE *getpw_tmp # endif ) { @@ -4701,6 +4726,16 @@ obj2uid(VALUE id struct passwd *pwptr; #ifdef USE_GETPWNAM_R struct passwd pwbuf; + char *getpw_buf; + long getpw_buf_len; + if (!*getpw_tmp) { + getpw_buf_len = sysconf(_SC_GETPW_R_SIZE_MAX); + if (getpw_buf_len < 0) getpw_buf_len = 4096; + getpw_buf = rb_alloc_tmp_buffer(getpw_tmp, getpw_buf_len); + } + else { + RSTRING_GETMEM(*getpw_tmp, getpw_buf, getpw_buf_len); + } if (getpwnam_r(usrname, &pwbuf, getpw_buf, getpw_buf_len, &pwptr)) rb_sys_fail("getpwnam_r"); #else @@ -4735,7 +4770,6 @@ obj2uid(VALUE id static VALUE p_uid_from_name(VALUE self, VALUE id) { - PREPARE_GETPWNAM return UIDT2NUM(OBJ2UID(id)); } # endif @@ -4745,7 +4779,7 @@ p_uid_from_name(VALUE self, VALUE id) static rb_gid_t obj2gid(VALUE id # ifdef USE_GETGRNAM_R - , char *getgr_buf, size_t getgr_buf_len + , VALUE *getgr_tmp # endif ) { @@ -4760,6 +4794,16 @@ obj2gid(VALUE id struct group *grptr; #ifdef USE_GETGRNAM_R struct group grbuf; + char *getgr_buf; + long getgr_buf_len; + if (!*getgr_tmp) { + getgr_buf_len = sysconf(_SC_GETGR_R_SIZE_MAX); + if (getgr_buf_len < 0) getgr_buf_len = 4096; + getgr_buf = rb_alloc_tmp_buffer(getgr_tmp, getgr_buf_len); + } + else { + RSTRING_GETMEM(*getgr_tmp, getgr_buf, getgr_buf_len); + } if (getgrnam_r(grpname, &grbuf, getgr_buf, getgr_buf_len, &grptr)) rb_sys_fail("getgrnam_r"); #else @@ -4794,7 +4838,6 @@ obj2gid(VALUE id static VALUE p_gid_from_name(VALUE self, VALUE id) { - PREPARE_GETGRNAM; return GIDT2NUM(OBJ2GID(id)); } # endif @@ -4813,7 +4856,6 @@ p_gid_from_name(VALUE self, VALUE id) static VALUE p_sys_setuid(VALUE obj, VALUE id) { - PREPARE_GETPWNAM; check_uid_switch(); if (setuid(OBJ2UID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -4836,7 +4878,6 @@ p_sys_setuid(VALUE obj, VALUE id) static VALUE p_sys_setruid(VALUE obj, VALUE id) { - PREPARE_GETPWNAM; check_uid_switch(); if (setruid(OBJ2UID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -4859,7 +4900,6 @@ p_sys_setruid(VALUE obj, VALUE id) static VALUE p_sys_seteuid(VALUE obj, VALUE id) { - PREPARE_GETPWNAM; check_uid_switch(); if (seteuid(OBJ2UID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -4884,9 +4924,13 @@ p_sys_seteuid(VALUE obj, VALUE id) static VALUE p_sys_setreuid(VALUE obj, VALUE rid, VALUE eid) { + rb_uid_t ruid, euid; PREPARE_GETPWNAM; check_uid_switch(); - if (setreuid(OBJ2UID(rid), OBJ2UID(eid)) != 0) rb_sys_fail(0); + ruid = OBJ2UID1(rid); + euid = OBJ2UID1(eid); + FINISH_GETPWNAM; + if (setreuid(ruid, euid) != 0) rb_sys_fail(0); return Qnil; } #else @@ -4909,9 +4953,14 @@ p_sys_setreuid(VALUE obj, VALUE rid, VALUE eid) static VALUE p_sys_setresuid(VALUE obj, VALUE rid, VALUE eid, VALUE sid) { + rb_uid_t ruid, euid, suid; PREPARE_GETPWNAM; check_uid_switch(); - if (setresuid(OBJ2UID(rid), OBJ2UID(eid), OBJ2UID(sid)) != 0) rb_sys_fail(0); + ruid = OBJ2UID1(rid); + euid = OBJ2UID1(eid); + suid = OBJ2UID1(sid); + FINISH_GETPWNAM; + if (setresuid(ruid, euid, suid) != 0) rb_sys_fail(0); return Qnil; } #else @@ -4951,7 +5000,6 @@ static VALUE proc_setuid(VALUE obj, VALUE id) { rb_uid_t uid; - PREPARE_GETPWNAM; check_uid_switch(); @@ -5023,7 +5071,6 @@ static VALUE p_uid_change_privilege(VALUE obj, VALUE id) { rb_uid_t uid; - PREPARE_GETPWNAM; check_uid_switch(); @@ -5193,7 +5240,6 @@ p_uid_change_privilege(VALUE obj, VALUE id) static VALUE p_sys_setgid(VALUE obj, VALUE id) { - PREPARE_GETGRNAM; check_gid_switch(); if (setgid(OBJ2GID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -5216,7 +5262,6 @@ p_sys_setgid(VALUE obj, VALUE id) static VALUE p_sys_setrgid(VALUE obj, VALUE id) { - PREPARE_GETGRNAM; check_gid_switch(); if (setrgid(OBJ2GID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -5239,7 +5284,6 @@ p_sys_setrgid(VALUE obj, VALUE id) static VALUE p_sys_setegid(VALUE obj, VALUE id) { - PREPARE_GETGRNAM; check_gid_switch(); if (setegid(OBJ2GID(id)) != 0) rb_sys_fail(0); return Qnil; @@ -5264,9 +5308,13 @@ p_sys_setegid(VALUE obj, VALUE id) static VALUE p_sys_setregid(VALUE obj, VALUE rid, VALUE eid) { + rb_gid_t rgid, egid; PREPARE_GETGRNAM; check_gid_switch(); - if (setregid(OBJ2GID(rid), OBJ2GID(eid)) != 0) rb_sys_fail(0); + rgid = OBJ2GID(rid); + egid = OBJ2GID(eid); + FINISH_GETGRNAM; + if (setregid(rgid, egid) != 0) rb_sys_fail(0); return Qnil; } #else @@ -5288,9 +5336,14 @@ p_sys_setregid(VALUE obj, VALUE rid, VALUE eid) static VALUE p_sys_setresgid(VALUE obj, VALUE rid, VALUE eid, VALUE sid) { + rb_gid_t rgid, egid, sgid; PREPARE_GETGRNAM; check_gid_switch(); - if (setresgid(OBJ2GID(rid), OBJ2GID(eid), OBJ2GID(sid)) != 0) rb_sys_fail(0); + rgid = OBJ2GID(rid); + egid = OBJ2GID(eid); + sgid = OBJ2GID(sid); + FINISH_GETGRNAM; + if (setresgid(rgid, egid, sgid) != 0) rb_sys_fail(0); return Qnil; } #else @@ -5358,7 +5411,6 @@ static VALUE proc_setgid(VALUE obj, VALUE id) { rb_gid_t gid; - PREPARE_GETGRNAM; check_gid_switch(); @@ -5506,8 +5558,9 @@ proc_setgroups(VALUE obj, VALUE ary) for (i = 0; i < ngroups; i++) { VALUE g = RARRAY_AREF(ary, i); - groups[i] = OBJ2GID(g); + groups[i] = OBJ2GID1(g); } + FINISH_GETGRNAM; if (setgroups(ngroups, groups) == -1) /* ngroups <= maxgroups */ rb_sys_fail(0); @@ -5540,7 +5593,6 @@ proc_setgroups(VALUE obj, VALUE ary) static VALUE proc_initgroups(VALUE obj, VALUE uname, VALUE base_grp) { - PREPARE_GETGRNAM; if (initgroups(StringValuePtr(uname), OBJ2GID(base_grp)) != 0) { rb_sys_fail(0); } @@ -5722,7 +5774,6 @@ static VALUE p_gid_change_privilege(VALUE obj, VALUE id) { rb_gid_t gid; - PREPARE_GETGRNAM; check_gid_switch(); @@ -5932,7 +5983,6 @@ proc_seteuid(rb_uid_t uid) static VALUE proc_seteuid_m(VALUE mod, VALUE euid) { - PREPARE_GETPWNAM; check_uid_switch(); proc_seteuid(OBJ2UID(euid)); return euid; @@ -5998,7 +6048,6 @@ rb_seteuid_core(rb_uid_t euid) static VALUE p_uid_grant_privilege(VALUE obj, VALUE id) { - PREPARE_GETPWNAM; rb_seteuid_core(OBJ2UID(id)); return id; } @@ -6038,7 +6087,6 @@ proc_setegid(VALUE obj, VALUE egid) { #if defined(HAVE_SETRESGID) || defined(HAVE_SETREGID) || defined(HAVE_SETEGID) || defined(HAVE_SETGID) rb_gid_t gid; - PREPARE_GETGRNAM; #endif check_gid_switch(); @@ -6130,7 +6178,6 @@ rb_setegid_core(rb_gid_t egid) static VALUE p_gid_grant_privilege(VALUE obj, VALUE id) { - PREPARE_GETGRNAM; rb_setegid_core(OBJ2GID(id)); return id; } -- cgit v1.2.3