Date: Thu, 31 Dec 2020 03:19:52 GMT From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 53bc3221561a - stable/12 - MFC addr2line label checks when DW_AT_range and DW_AT_low_pc cannot be used Message-ID: <202012310319.0BV3Jqd0063607@gitrepo.freebsd.org>
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The branch stable/12 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=53bc3221561aac01410087646444dc4d4ef41f37 commit 53bc3221561aac01410087646444dc4d4ef41f37 Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2020-11-19 21:10:36 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2020-12-31 03:19:32 +0000 MFC addr2line label checks when DW_AT_range and DW_AT_low_pc cannot be used addr2line: swap if conditions for diff reduction in upcoming change No functional change intended. (cherry picked from commit 65c207758a9586116a023dea8eb3d173e85cb0a9) addr2line: add label checks when DW_AT_range and DW_AT_low_pc cannot be used Check label's ranges for address we want to translate if a CU doesn't have usable DW_AT_range or DW_AT_low_pc. Use more appropriate names: "struct CU" -> "struct range" Developed as part of upstream ELF Tool Chain bug report https://sourceforge.net/p/elftoolchain/tickets/552/ although this does not address the specific case reported there. Submitted by: Tiger Gao <tig@freebsdfoundation.org> Sponsored by: The FreeBSD Foundation Differential Revision: D23782 (cherry picked from commit a36179937e7e768d1840896ac1ea13ba6f118a09) addr2line: rework check_range conditions Simplify logic and reduce indentation for DW_AT_low_pc case. Reviewed by: Tiger Gao, markj Sponsored by: The FreeBSD Foundation Differential Revision: D27426 (cherry picked from commit f4d6ed9a5c5f5e78b9e20ae0c4b3ab78922aaf20) addr2line: fix allocation leak in error path CID: 1437677 Reported by: Coverity Scan Sponsored by: The FreeBSD Foundation (cherry picked from commit 67b94fc58e61a78225930d54eadaba77f46a73b7) --- contrib/elftoolchain/addr2line/addr2line.c | 317 +++++++++++++++++++++-------- 1 file changed, 231 insertions(+), 86 deletions(-) diff --git a/contrib/elftoolchain/addr2line/addr2line.c b/contrib/elftoolchain/addr2line/addr2line.c index 123ce8cce9b3..db8f84eef780 100644 --- a/contrib/elftoolchain/addr2line/addr2line.c +++ b/contrib/elftoolchain/addr2line/addr2line.c @@ -56,8 +56,8 @@ struct Func { STAILQ_ENTRY(Func) next; }; -struct CU { - RB_ENTRY(CU) entry; +struct range { + RB_ENTRY(range) entry; Dwarf_Off off; Dwarf_Unsigned lopc; Dwarf_Unsigned hipc; @@ -88,16 +88,16 @@ static char unknown[] = { '?', '?', '\0' }; static Dwarf_Addr section_base; /* Need a new curlopc that stores last lopc value. */ static Dwarf_Unsigned curlopc = ~0ULL; -static RB_HEAD(cutree, CU) cuhead = RB_INITIALIZER(&cuhead); +static RB_HEAD(cutree, range) cuhead = RB_INITIALIZER(&cuhead); static int -lopccmp(struct CU *e1, struct CU *e2) +lopccmp(struct range *e1, struct range *e2) { return (e1->lopc < e2->lopc ? -1 : e1->lopc > e2->lopc); } -RB_PROTOTYPE(cutree, CU, entry, lopccmp); -RB_GENERATE(cutree, CU, entry, lopccmp) +RB_PROTOTYPE(cutree, range, entry, lopccmp); +RB_GENERATE(cutree, range, entry, lopccmp) #define USAGE_MESSAGE "\ Usage: %s [options] hexaddress...\n\ @@ -170,7 +170,7 @@ handle_high_pc(Dwarf_Die die, Dwarf_Unsigned lopc, Dwarf_Unsigned *hipc) } static struct Func * -search_func(struct CU *cu, Dwarf_Unsigned addr) +search_func(struct range *range, Dwarf_Unsigned addr) { struct Func *f, *f0; Dwarf_Unsigned lopc, hipc, addr_base; @@ -178,7 +178,7 @@ search_func(struct CU *cu, Dwarf_Unsigned addr) f0 = NULL; - STAILQ_FOREACH(f, &cu->funclist, next) { + STAILQ_FOREACH(f, &range->funclist, next) { if (f->ranges != NULL) { addr_base = 0; for (i = 0; i < f->ranges_cnt; i++) { @@ -215,7 +215,8 @@ search_func(struct CU *cu, Dwarf_Unsigned addr) } static void -collect_func(Dwarf_Debug dbg, Dwarf_Die die, struct Func *parent, struct CU *cu) +collect_func(Dwarf_Debug dbg, Dwarf_Die die, struct Func *parent, + struct range *range) { Dwarf_Die ret_die, abst_die, spec_die; Dwarf_Error de; @@ -237,7 +238,7 @@ collect_func(Dwarf_Debug dbg, Dwarf_Die die, struct Func *parent, struct CU *cu) goto cont_search; } if (tag == DW_TAG_subprogram || tag == DW_TAG_entry_point || - tag == DW_TAG_inlined_subroutine) { + tag == DW_TAG_inlined_subroutine || tag == DW_TAG_label) { /* * Function address range can be specified by either * a DW_AT_ranges attribute which points to a range list or @@ -257,14 +258,21 @@ collect_func(Dwarf_Debug dbg, Dwarf_Die die, struct Func *parent, struct CU *cu) } /* - * Search for DW_AT_low_pc/DW_AT_high_pc if ranges pointer - * not found. - */ - if (dwarf_attrval_unsigned(die, DW_AT_low_pc, &lopc, &de) || - dwarf_attrval_unsigned(die, DW_AT_high_pc, &hipc, &de)) - goto cont_search; - if (handle_high_pc(die, lopc, &hipc) != DW_DLV_OK) - goto cont_search; + * Ranges pointer not found. Search for DW_AT_low_pc, and + * DW_AT_high_pc iff die is not a label. Labels doesn't have + * hipc attr. */ + if (tag == DW_TAG_label) { + if (dwarf_attrval_unsigned(die, DW_AT_low_pc, &lopc, + &de) != DW_DLV_OK) + goto cont_search; + } else { + if (dwarf_attrval_unsigned(die, DW_AT_low_pc, &lopc, + &de) || dwarf_attrval_unsigned(die, DW_AT_high_pc, + &hipc, &de)) + goto cont_search; + if (handle_high_pc(die, lopc, &hipc) != DW_DLV_OK) + goto cont_search; + } get_func_name: /* @@ -322,7 +330,7 @@ collect_func(Dwarf_Debug dbg, Dwarf_Die die, struct Func *parent, struct CU *cu) dwarf_attrval_unsigned(die, DW_AT_call_line, &f->call_line, &de); } - STAILQ_INSERT_TAIL(&cu->funclist, f, next); + STAILQ_INSERT_TAIL(&range->funclist, f, next); } cont_search: @@ -333,9 +341,9 @@ cont_search: warnx("dwarf_child: %s", dwarf_errmsg(de)); else if (ret == DW_DLV_OK) { if (f != NULL) - collect_func(dbg, ret_die, f, cu); + collect_func(dbg, ret_die, f, range); else - collect_func(dbg, ret_die, parent, cu); + collect_func(dbg, ret_die, parent, range); } /* Search sibling. */ @@ -343,10 +351,10 @@ cont_search: if (ret == DW_DLV_ERROR) warnx("dwarf_siblingof: %s", dwarf_errmsg(de)); else if (ret == DW_DLV_OK) - collect_func(dbg, ret_die, parent, cu); + collect_func(dbg, ret_die, parent, range); /* Cleanup */ - if (die != cu->die) + if (die != range->die) dwarf_dealloc(dbg, die, DW_DLA_DIE); if (abst_die != NULL) @@ -357,14 +365,14 @@ cont_search: } static void -print_inlines(struct CU *cu, struct Func *f, Dwarf_Unsigned call_file, +print_inlines(struct range *range, struct Func *f, Dwarf_Unsigned call_file, Dwarf_Unsigned call_line) { char demangled[1024]; char *file; - if (call_file > 0 && (Dwarf_Signed) call_file <= cu->nsrcfiles) - file = cu->srcfiles[call_file - 1]; + if (call_file > 0 && (Dwarf_Signed) call_file <= range->nsrcfiles) + file = range->srcfiles[call_file - 1]; else file = unknown; @@ -389,14 +397,14 @@ print_inlines(struct CU *cu, struct Func *f, Dwarf_Unsigned call_file, (uintmax_t) call_line); if (f->inlined_caller != NULL) - print_inlines(cu, f->inlined_caller, f->call_file, + print_inlines(range, f->inlined_caller, f->call_file, f->call_line); } -static struct CU * +static struct range * culookup(Dwarf_Unsigned addr) { - struct CU find, *res; + struct range find, *res; find.lopc = addr; res = RB_NFIND(cutree, &cuhead, &find); @@ -414,12 +422,150 @@ culookup(Dwarf_Unsigned addr) } /* - * Check whether addr falls into range(s) of current CU, and save current CU - * to lookup tree if so. + * When DW_AT_ranges, DW_AT_low_pc/DW_AT_high_pc are all absent, we check the + * children of cu die for labels. If the address falls into one of the labels + * ranges(aranges), return the label DIE. + */ +static int +check_labels(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Unsigned addr, + struct range **range) { + Dwarf_Addr start; + Dwarf_Arange *aranges; + Dwarf_Die prev_die, ret_die; + Dwarf_Error de; + Dwarf_Half tag; + Dwarf_Off die_off; + Dwarf_Unsigned lopc, length; + Dwarf_Signed arcnt; + struct range *labelp, **labels; + int i, j, label_cnt, ret; + + prev_die = ret_die = NULL; + labels = NULL; + i = label_cnt = 0; + + /* Find aranges. */ + ret = dwarf_get_aranges(dbg, &aranges, &arcnt, &de); + if (ret != DW_DLV_OK && ret != DW_DLV_NO_ENTRY) + warnx("dwarf_get_aranges failed: %s", dwarf_errmsg(de)); + + /* Child of current CU. */ + ret = dwarf_child(die, &prev_die, &de); + if (ret == DW_DLV_ERROR) + warnx("dwarf_child: %s", dwarf_errmsg(de)); + + /* Count labels. */ + while (1) { + if (dwarf_tag(prev_die, &tag, &de) != DW_DLV_OK) { + warnx("dwarf_tag failed: %s", + dwarf_errmsg(de)); + return DW_DLV_ERROR; + } + if (tag == DW_TAG_label) { + if (dwarf_attrval_unsigned(prev_die, DW_AT_low_pc, + &lopc, &de) == DW_DLV_OK) + label_cnt++; + } + + if (dwarf_siblingof(dbg, prev_die, &ret_die, &de) != DW_DLV_OK) + break; + + if (prev_die != NULL) + dwarf_dealloc(dbg, prev_die, DW_DLA_DIE); + prev_die = ret_die; + } + + if (label_cnt == 0) + return (DW_DLV_NO_ENTRY); + + /* Allocate space for labels. */ + if ((labels = calloc(label_cnt, sizeof(struct range *))) == NULL) + err(EXIT_FAILURE, "calloc"); + + /* Add labels to list. */ + ret = dwarf_child(die, &prev_die, &de); + if (ret == DW_DLV_ERROR) + warnx("dwarf_child: %s", dwarf_errmsg(de)); + while (1) { + if (dwarf_tag(prev_die, &tag, &de) != DW_DLV_OK) { + warnx("dwarf_tag failed: %s", + dwarf_errmsg(de)); + free(labels); + return DW_DLV_ERROR; + } + if (tag == DW_TAG_label) { + if (dwarf_attrval_unsigned(prev_die, DW_AT_low_pc, + &lopc, &de) == DW_DLV_OK) { + if (curlopc == lopc) { + for (i = 0; i < label_cnt - 1; i++) { + if (labels[i] != *range) + free(labels[i]); + } + free(labels); + return DW_DLV_ERROR; + } + labelp = calloc(1, sizeof(struct range)); + if (labelp == NULL) + err(EXIT_FAILURE, "calloc"); + labelp->lopc = lopc; + labelp->die = prev_die; + labelp->dbg = dbg; + STAILQ_INIT(&labelp->funclist); + labels[i++] = labelp; + } + } + if (dwarf_siblingof(dbg, prev_die, &ret_die, &de) != DW_DLV_OK) + break; + if (prev_die != NULL && tag != DW_TAG_label) + dwarf_dealloc(dbg, prev_die, DW_DLA_DIE); + prev_die = ret_die; + } + + /* Set hipc for each label using aranges */ + for (i = 0; i < label_cnt; i++) { + for (j = 0; j < arcnt; j++) { + if (dwarf_get_arange_info(aranges[j], &start, &length, + &die_off, &de) != DW_DLV_OK) { + warnx("dwarf_get_arange_info failed: %s", + dwarf_errmsg(de)); + continue; + } + if (labels[i]->lopc == (Dwarf_Unsigned)start) { + labels[i]->hipc = start + length; + break; + } + } + } + + /* If addr in label's range, we have found the range for this label. */ + for (i = 0; i < label_cnt; i++) { + if (addr >= labels[i]->lopc && addr < labels[i]->hipc) { + *range = labels[i]; + RB_INSERT(cutree, &cuhead, (*range)); + curlopc = (*range)->lopc; + break; + } + } + + for (i = 0; i < label_cnt - 1; i++) { + if (labels[i] != *range) + free(labels[i]); + } + free(labels); + + if (*range != NULL) + return (DW_DLV_OK); + else + return (DW_DLV_NO_ENTRY); +} + +/* + * Check whether addr falls into range(s) of current CU. + * If so, save current CU to lookup tree. */ static int check_range(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Unsigned addr, - struct CU **cu) + struct range **range) { Dwarf_Error de; Dwarf_Unsigned addr_base, lopc, hipc; @@ -427,38 +573,15 @@ check_range(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Unsigned addr, Dwarf_Signed ranges_cnt; Dwarf_Ranges *ranges; int i, ret; - bool in_range; + bool in_cu; addr_base = 0; ranges = NULL; ranges_cnt = 0; - in_range = false; + in_cu = false; - ret = dwarf_attrval_unsigned(die, DW_AT_ranges, &ranges_off, &de); - if (ret == DW_DLV_NO_ENTRY) { - if (dwarf_attrval_unsigned(die, DW_AT_low_pc, &lopc, &de) == - DW_DLV_OK) { - if (lopc == curlopc) - return (DW_DLV_ERROR); - if (dwarf_attrval_unsigned(die, DW_AT_high_pc, &hipc, - &de) == DW_DLV_OK) { - /* - * Check if the address falls into the PC - * range of this CU. - */ - if (handle_high_pc(die, lopc, &hipc) != - DW_DLV_OK) - return (DW_DLV_ERROR); - } else { - /* Assume ~0ULL if DW_AT_high_pc not present */ - hipc = ~0ULL; - } - - if (addr >= lopc && addr < hipc) { - in_range = true; - } - } - } else if (ret == DW_DLV_OK) { + if (dwarf_attrval_unsigned(die, DW_AT_ranges, &ranges_off, &de) == + DW_DLV_OK) { ret = dwarf_get_ranges(dbg, ranges_off, &ranges, &ranges_cnt, NULL, &de); if (ret != DW_DLV_OK) @@ -485,23 +608,45 @@ check_range(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Unsigned addr, return (DW_DLV_ERROR); if (addr >= lopc && addr < hipc){ - in_range = true; + in_cu = true; break; } } + } else if (dwarf_attrval_unsigned(die, DW_AT_low_pc, &lopc, &de) == + DW_DLV_OK) { + if (lopc == curlopc) + return (DW_DLV_ERROR); + if (dwarf_attrval_unsigned(die, DW_AT_high_pc, &hipc, &de) == + DW_DLV_OK) { + /* + * Check if the address falls into the PC + * range of this CU. + */ + if (handle_high_pc(die, lopc, &hipc) != DW_DLV_OK) + return (DW_DLV_ERROR); + } else { + /* Assume ~0ULL if DW_AT_high_pc not present. */ + hipc = ~0ULL; + } + + if (addr >= lopc && addr < hipc) { + in_cu = true; + } } else { - return (DW_DLV_ERROR); + /* Addr not found above, try labels. */ + ret = check_labels(dbg, die, addr, range); + return ret; } - - if (in_range) { - if ((*cu = calloc(1, sizeof(struct CU))) == NULL) + + if (in_cu) { + if ((*range = calloc(1, sizeof(struct range))) == NULL) err(EXIT_FAILURE, "calloc"); - (*cu)->lopc = lopc; - (*cu)->hipc = hipc; - (*cu)->die = die; - (*cu)->dbg = dbg; - STAILQ_INIT(&(*cu)->funclist); - RB_INSERT(cutree, &cuhead, *cu); + (*range)->lopc = lopc; + (*range)->hipc = hipc; + (*range)->die = die; + (*range)->dbg = dbg; + STAILQ_INIT(&(*range)->funclist); + RB_INSERT(cutree, &cuhead, *range); curlopc = lopc; return (DW_DLV_OK); } else { @@ -519,7 +664,7 @@ translate(Dwarf_Debug dbg, Elf *e, const char* addrstr) Dwarf_Unsigned addr, lineno, plineno; Dwarf_Signed lcount; Dwarf_Addr lineaddr, plineaddr; - struct CU *cu; + struct range *range; struct Func *f; const char *funcname; char *file, *file0, *pfile; @@ -533,10 +678,10 @@ translate(Dwarf_Debug dbg, Elf *e, const char* addrstr) die = NULL; ret = DW_DLV_OK; - cu = culookup(addr); - if (cu != NULL) { - die = cu->die; - dbg = cu->dbg; + range = culookup(addr); + if (range != NULL) { + die = range->die; + dbg = range->dbg; goto status_ok; } @@ -575,7 +720,7 @@ translate(Dwarf_Debug dbg, Elf *e, const char* addrstr) warnx("could not find DW_TAG_compile_unit die"); goto next_cu; } - ret = check_range(dbg, die, addr, &cu); + ret = check_range(dbg, die, addr, &range); if (ret == DW_DLV_OK) break; if (ret == DW_DLV_ERROR) @@ -633,16 +778,16 @@ status_ok: out: f = NULL; funcname = NULL; - if (ret == DW_DLV_OK && (func || inlines) && cu != NULL) { - if (cu->srcfiles == NULL) - if (dwarf_srcfiles(die, &cu->srcfiles, &cu->nsrcfiles, - &de)) + if (ret == DW_DLV_OK && (func || inlines) && range != NULL) { + if (range->srcfiles == NULL) + if (dwarf_srcfiles(die, &range->srcfiles, + &range->nsrcfiles, &de)) warnx("dwarf_srcfiles: %s", dwarf_errmsg(de)); - if (STAILQ_EMPTY(&cu->funclist)) { - collect_func(dbg, die, NULL, cu); + if (STAILQ_EMPTY(&range->funclist)) { + collect_func(dbg, range->die, NULL, range); die = NULL; } - f = search_func(cu, addr); + f = search_func(range, addr); if (f != NULL) funcname = f->name; } @@ -685,9 +830,9 @@ out: (void) printf("%s:%ju\n", base ? basename(file) : file, (uintmax_t) lineno); - if (ret == DW_DLV_OK && inlines && cu != NULL && - cu->srcfiles != NULL && f != NULL && f->inlined_caller != NULL) - print_inlines(cu, f->inlined_caller, f->call_file, + if (ret == DW_DLV_OK && inlines && range != NULL && + range->srcfiles != NULL && f != NULL && f->inlined_caller != NULL) + print_inlines(range, f->inlined_caller, f->call_file, f->call_line); }
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