#include #include #include #include #include "util/dso.h" #include "util/util.h" #include "util/debug.h" #include "symbol.h" bool srcline_full_filename; #ifdef HAVE_LIBBFD_SUPPORT /* * Implement addr2line using libbfd. */ #define PACKAGE "perf" #include struct a2l_data { const char *input; u64 addr; bool found; const char *filename; const char *funcname; unsigned line; bfd *abfd; asymbol **syms; }; static int bfd_error(const char *string) { const char *errmsg; errmsg = bfd_errmsg(bfd_get_error()); fflush(stdout); if (string) pr_debug("%s: %s\n", string, errmsg); else pr_debug("%s\n", errmsg); return -1; } static int slurp_symtab(bfd *abfd, struct a2l_data *a2l) { long storage; long symcount; asymbol **syms; bfd_boolean dynamic = FALSE; if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0) return bfd_error(bfd_get_filename(abfd)); storage = bfd_get_symtab_upper_bound(abfd); if (storage == 0L) { storage = bfd_get_dynamic_symtab_upper_bound(abfd); dynamic = TRUE; } if (storage < 0L) return bfd_error(bfd_get_filename(abfd)); syms = malloc(storage); if (dynamic) symcount = bfd_canonicalize_dynamic_symtab(abfd, syms); else symcount = bfd_canonicalize_symtab(abfd, syms); if (symcount < 0) { free(syms); return bfd_error(bfd_get_filename(abfd)); } a2l->syms = syms; return 0; } static void find_address_in_section(bfd *abfd, asection *section, void *data) { bfd_vma pc, vma; bfd_size_type size; struct a2l_data *a2l = data; if (a2l->found) return; if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0) return; pc = a2l->addr; vma = bfd_get_section_vma(abfd, section); size = bfd_get_section_size(section); if (pc < vma || pc >= vma + size) return; a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma, &a2l->filename, &a2l->funcname, &a2l->line); } static struct a2l_data *addr2line_init(const char *path) { bfd *abfd; struct a2l_data *a2l = NULL; abfd = bfd_openr(path, NULL); if (abfd == NULL) return NULL; if (!bfd_check_format(abfd, bfd_object)) goto out; a2l = zalloc(sizeof(*a2l)); if (a2l == NULL) goto out; a2l->abfd = abfd; a2l->input = strdup(path); if (a2l->input == NULL) goto out; if (slurp_symtab(abfd, a2l)) goto out; return a2l; out: if (a2l) { zfree((char **)&a2l->input); free(a2l); } bfd_close(abfd); return NULL; } static void addr2line_cleanup(struct a2l_data *a2l) { if (a2l->abfd) bfd_close(a2l->abfd); zfree((char **)&a2l->input); zfree(&a2l->syms); free(a2l); } #define MAX_INLINE_NEST 1024 static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line, struct dso *dso, bool unwind_inlines) { int ret = 0; struct a2l_data *a2l = dso->a2l; if (!a2l) { dso->a2l = addr2line_init(dso_name); a2l = dso->a2l; } if (a2l == NULL) { pr_warning("addr2line_init failed for %s\n", dso_name); return 0; } a2l->addr = addr; a2l->found = false; bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l); if (a2l->found && unwind_inlines) { int cnt = 0; while (bfd_find_inliner_info(a2l->abfd, &a2l->filename, &a2l->funcname, &a2l->line) && cnt++ < MAX_INLINE_NEST) ; } if (a2l->found && a2l->filename) { *file = strdup(a2l->filename); *line = a2l->line; if (*file) ret = 1; } return ret; } void dso__free_a2l(struct dso *dso) { struct a2l_data *a2l = dso->a2l; if (!a2l) return; addr2line_cleanup(a2l); dso->a2l = NULL; } #else /* HAVE_LIBBFD_SUPPORT */ static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line_nr, struct dso *dso __maybe_unused, bool unwind_inlines __maybe_unused) { FILE *fp; char cmd[PATH_MAX]; char *filename = NULL; size_t len; char *sep; int ret = 0; scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64, dso_name, addr); fp = popen(cmd, "r"); if (fp == NULL) { pr_warning("popen failed for %s\n", dso_name); return 0; } if (getline(&filename, &len, fp) < 0 || !len) { pr_warning("addr2line has no output for %s\n", dso_name); goto out; } sep = strchr(filename, '\n'); if (sep) *sep = '\0'; if (!strcmp(filename, "??:0")) { pr_debug("no debugging info in %s\n", dso_name); free(filename); goto out; } sep = strchr(filename, ':'); if (sep) { *sep++ = '\0'; *file = filename; *line_nr = strtoul(sep, NULL, 0); ret = 1; } out: pclose(fp); return ret; } void dso__free_a2l(struct dso *dso __maybe_unused) { } #endif /* HAVE_LIBBFD_SUPPORT */ /* * Number of addr2line failures (without success) before disabling it for that * dso. */ #define A2L_FAIL_LIMIT 123 char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, bool show_sym, bool unwind_inlines) { char *file = NULL; unsigned line = 0; char *srcline; const char *dso_name; if (!dso->has_srcline) goto out; if (dso->symsrc_filename) dso_name = dso->symsrc_filename; else dso_name = dso->long_name; if (dso_name[0] == '[') goto out; if (!strncmp(dso_name, "/tmp/perf-", 10)) goto out; if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines)) goto out; if (asprintf(&srcline, "%s:%u", srcline_full_filename ? file : basename(file), line) < 0) { free(file); goto out; } dso->a2l_fails = 0; free(file); return srcline; out: if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) { dso->has_srcline = 0; dso__free_a2l(dso); } if (sym) { if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "", addr - sym->start) < 0) return SRCLINE_UNKNOWN; } else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0) return SRCLINE_UNKNOWN; return srcline; } void free_srcline(char *srcline) { if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0) free(srcline); } char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, bool show_sym) { return __get_srcline(dso, addr, sym, show_sym, false); } latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/mac80211/wep.c')