From 3cb2e144f8b74f9d78d93ba15e2d66e432462860 Mon Sep 17 00:00:00 2001 From: Armin Kuster Date: Thu, 26 Aug 2021 16:21:59 -0700 Subject: binutils: Security fix for CVE-2021-3549 Source: git://sourceware.org/binutils-gdb.git MR: 111523 Type: Security Fix Disposition: Backport from https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1cfcf3004e1830f8fe9112cfcd15285508d2c2b7 ChangeID: 2d3161f601852eb8f9a9ca982c6b0cd44e036bc6 Description: Affects <= 2.36 Fixup Changelog to apply to dunfel context. Signed-off-by: Armin Kuster Signed-off-by: Steve Sakoman --- meta/recipes-devtools/binutils/binutils-2.34.inc | 1 + .../binutils/binutils/CVE-2021-3549.patch | 187 +++++++++++++++++++++ 2 files changed, 188 insertions(+) create mode 100644 meta/recipes-devtools/binutils/binutils/CVE-2021-3549.patch diff --git a/meta/recipes-devtools/binutils/binutils-2.34.inc b/meta/recipes-devtools/binutils/binutils-2.34.inc index 3e10279b1d..1c1118df54 100644 --- a/meta/recipes-devtools/binutils/binutils-2.34.inc +++ b/meta/recipes-devtools/binutils/binutils-2.34.inc @@ -48,5 +48,6 @@ SRC_URI = "\ file://CVE-2020-16598.patch \ file://CVE-2021-20197.patch \ file://CVE-2021-3487.patch \ + file://CVE-2021-3549.patch \ " S = "${WORKDIR}/git" diff --git a/meta/recipes-devtools/binutils/binutils/CVE-2021-3549.patch b/meta/recipes-devtools/binutils/binutils/CVE-2021-3549.patch new file mode 100644 index 0000000000..4391db340a --- /dev/null +++ b/meta/recipes-devtools/binutils/binutils/CVE-2021-3549.patch @@ -0,0 +1,187 @@ +From 1cfcf3004e1830f8fe9112cfcd15285508d2c2b7 Mon Sep 17 00:00:00 2001 +From: Alan Modra +Date: Thu, 11 Feb 2021 16:56:42 +1030 +Subject: [PATCH] PR27290, PR27293, PR27295, various avr objdump fixes + +Adds missing sanity checks for avr device info note, to avoid +potential buffer overflows. Uses bfd_malloc_and_get_section for +sanity checking section size. + + PR 27290 + PR 27293 + PR 27295 + * od-elf32_avr.c (elf32_avr_get_note_section_contents): Formatting. + Use bfd_malloc_and_get_section. + (elf32_avr_get_note_desc): Formatting. Return descsz. Sanity + check namesz. Return NULL if descsz is too small. Ensure + string table is terminated. + (elf32_avr_get_device_info): Formatting. Add note_size param. + Sanity check note. + (elf32_avr_dump_mem_usage): Adjust to suit. + +Upstream-Status: Backport +CVE: CVE-2021-3549 +Signed-of-by: Armin Kuster + +--- + binutils/ChangeLog | 14 +++++++++ + binutils/od-elf32_avr.c | 66 ++++++++++++++++++++++++++--------------- + 2 files changed, 56 insertions(+), 24 deletions(-) + +Index: git/binutils/od-elf32_avr.c +=================================================================== +--- git.orig/binutils/od-elf32_avr.c ++++ git/binutils/od-elf32_avr.c +@@ -77,23 +77,29 @@ elf32_avr_filter (bfd *abfd) + return bfd_get_flavour (abfd) == bfd_target_elf_flavour; + } + +-static char* ++static char * + elf32_avr_get_note_section_contents (bfd *abfd, bfd_size_type *size) + { + asection *section; ++ bfd_byte *contents; + +- if ((section = bfd_get_section_by_name (abfd, ".note.gnu.avr.deviceinfo")) == NULL) ++ section = bfd_get_section_by_name (abfd, ".note.gnu.avr.deviceinfo"); ++ if (section == NULL) + return NULL; + +- *size = bfd_section_size (section); +- char *contents = (char *) xmalloc (*size); +- bfd_get_section_contents (abfd, section, contents, 0, *size); ++ if (!bfd_malloc_and_get_section (abfd, section, &contents)) ++ { ++ free (contents); ++ contents = NULL; ++ } + +- return contents; ++ *size = bfd_section_size (section); ++ return (char *) contents; + } + +-static char* elf32_avr_get_note_desc (bfd *abfd, char *contents, +- bfd_size_type size) ++static char * ++elf32_avr_get_note_desc (bfd *abfd, char *contents, bfd_size_type size, ++ bfd_size_type *descsz) + { + Elf_External_Note *xnp = (Elf_External_Note *) contents; + Elf_Internal_Note in; +@@ -107,42 +113,54 @@ static char* elf32_avr_get_note_desc (bf + if (in.namesz > contents - in.namedata + size) + return NULL; + ++ if (in.namesz != 4 || strcmp (in.namedata, "AVR") != 0) ++ return NULL; ++ + in.descsz = bfd_get_32 (abfd, xnp->descsz); + in.descdata = in.namedata + align_power (in.namesz, 2); +- if (in.descsz != 0 +- && (in.descdata >= contents + size +- || in.descsz > contents - in.descdata + size)) ++ if (in.descsz < 6 * sizeof (uint32_t) ++ || in.descdata >= contents + size ++ || in.descsz > contents - in.descdata + size) + return NULL; + +- if (strcmp (in.namedata, "AVR") != 0) +- return NULL; ++ /* If the note has a string table, ensure it is 0 terminated. */ ++ if (in.descsz > 8 * sizeof (uint32_t)) ++ in.descdata[in.descsz - 1] = 0; + ++ *descsz = in.descsz; + return in.descdata; + } + + static void + elf32_avr_get_device_info (bfd *abfd, char *description, +- deviceinfo *device) ++ bfd_size_type desc_size, deviceinfo *device) + { + if (description == NULL) + return; + + const bfd_size_type memory_sizes = 6; + +- memcpy (device, description, memory_sizes * sizeof(uint32_t)); +- device->name = NULL; ++ memcpy (device, description, memory_sizes * sizeof (uint32_t)); ++ desc_size -= memory_sizes * sizeof (uint32_t); ++ if (desc_size < 8) ++ return; + +- uint32_t *stroffset_table = ((uint32_t *) description) + memory_sizes; ++ uint32_t *stroffset_table = (uint32_t *) description + memory_sizes; + bfd_size_type stroffset_table_size = bfd_get_32 (abfd, stroffset_table); +- char *str_table = ((char *) stroffset_table) + stroffset_table_size; + + /* If the only content is the size itself, there's nothing in the table */ +- if (stroffset_table_size == 4) ++ if (stroffset_table_size < 8) + return; ++ if (desc_size <= stroffset_table_size) ++ return; ++ desc_size -= stroffset_table_size; + + /* First entry is the device name index. */ + uint32_t device_name_index = bfd_get_32 (abfd, stroffset_table + 1); ++ if (device_name_index >= desc_size) ++ return; + ++ char *str_table = (char *) stroffset_table + stroffset_table_size; + device->name = str_table + device_name_index; + } + +@@ -183,7 +201,7 @@ static void + elf32_avr_dump_mem_usage (bfd *abfd) + { + char *description = NULL; +- bfd_size_type note_section_size = 0; ++ bfd_size_type sec_size, desc_size; + + deviceinfo device = { 0, 0, 0, 0, 0, 0, NULL }; + device.name = "Unknown"; +@@ -192,13 +210,13 @@ elf32_avr_dump_mem_usage (bfd *abfd) + bfd_size_type text_usage = 0; + bfd_size_type eeprom_usage = 0; + +- char *contents = elf32_avr_get_note_section_contents (abfd, +- ¬e_section_size); ++ char *contents = elf32_avr_get_note_section_contents (abfd, &sec_size); + + if (contents != NULL) + { +- description = elf32_avr_get_note_desc (abfd, contents, note_section_size); +- elf32_avr_get_device_info (abfd, description, &device); ++ description = elf32_avr_get_note_desc (abfd, contents, sec_size, ++ &desc_size); ++ elf32_avr_get_device_info (abfd, description, desc_size, &device); + } + + elf32_avr_get_memory_usage (abfd, &text_usage, &data_usage, +Index: git/binutils/ChangeLog +=================================================================== +--- git.orig/binutils/ChangeLog ++++ git/binutils/ChangeLog +@@ -1,3 +1,17 @@ ++2021-02-11 Alan Modra ++ ++ PR 27290 ++ PR 27293 ++ PR 27295 ++ * od-elf32_avr.c (elf32_avr_get_note_section_contents): Formatting. ++ Use bfd_malloc_and_get_section. ++ (elf32_avr_get_note_desc): Formatting. Return descsz. Sanity ++ check namesz. Return NULL if descsz is too small. Ensure ++ string table is terminated. ++ (elf32_avr_get_device_info): Formatting. Add note_size param. ++ Sanity check note. ++ (elf32_avr_dump_mem_usage): Adjust to suit. ++ + 2020-02-01 Nick Clifton + + * configure: Regenerate. -- cgit 1.2.3-korg