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commit 75f2de448f311807e2493f2a37a980e2d872b229
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Author: Mark Wielaard <mark@klomp.org>
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Date: Thu Nov 3 13:38:45 2022 +0100
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readelf: Check phdr != NULL or shdr != NULL in handle_dynamic.
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The compiler doesn't know that when use_dynamic_segment is true,
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then phdr should/will be non-NULL and otherwise shdr is non-NULL.
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Add explicit checks to help the compiler out and in case an error
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is made calling the handle_dynamic function.
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Signed-off-by: Mark Wielaard <mark@klomp.org>
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diff --git a/src/readelf.c b/src/readelf.c
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index 0e0b05c4..e721a209 100644
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--- a/src/readelf.c
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+++ b/src/readelf.c
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@@ -1828,7 +1828,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
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size_t dyn_ents;
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/* Get the data of the section. */
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- if (use_dynamic_segment)
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+ if (use_dynamic_segment && phdr != NULL)
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data = elf_getdata_rawchunk(ebl->elf, phdr->p_offset,
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phdr->p_filesz, ELF_T_DYN);
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else
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@@ -1840,7 +1840,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
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/* Get the dynamic section entry number */
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dyn_ents = get_dyn_ents (data);
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- if (!use_dynamic_segment)
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+ if (!use_dynamic_segment && shdr != NULL)
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{
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/* Get the section header string table index. */
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if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
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@@ -1862,7 +1862,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
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(int) shdr->sh_link,
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elf_strptr (ebl->elf, shstrndx, glink->sh_name));
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}
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- else
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+ else if (phdr != NULL)
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{
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printf (ngettext ("\
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\nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 "\n",
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@@ -1879,7 +1879,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
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/* if --use-dynamic option is enabled,
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use the string table to get the related library info. */
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Elf_Data *strtab_data = NULL;
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- if (use_dynamic_segment)
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+ if (use_dynamic_segment && phdr != NULL)
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{
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strtab_data = get_dynscn_strtab(ebl->elf, phdr);
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if (strtab_data == NULL)
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@@ -1903,7 +1903,7 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
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|| dyn->d_tag == DT_RPATH
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|| dyn->d_tag == DT_RUNPATH)
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{
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- if (! use_dynamic_segment)
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+ if (! use_dynamic_segment && shdr != NULL)
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name = elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val);
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else if (dyn->d_un.d_val < strtab_data->d_size
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&& memrchr (strtab_data->d_buf + dyn->d_un.d_val, '\0',
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commit b0a0235771906e3bcd6174c4e3c020b5522b0be5
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Author: Mark Wielaard <mark@klomp.org>
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Date: Thu Nov 3 13:44:35 2022 +0100
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libdw: Don't dereference and assign values we are skipping
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We don't use the FDE address encoding byte, so no reason
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to read and store it. Just skip past it.
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Signed-off-by: Mark Wielaard <mark@klomp.org>
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diff --git a/libdw/dwarf_next_cfi.c b/libdw/dwarf_next_cfi.c
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index 23b16885..be08984f 100644
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--- a/libdw/dwarf_next_cfi.c
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+++ b/libdw/dwarf_next_cfi.c
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@@ -226,7 +226,7 @@ dwarf_next_cfi (const unsigned char e_ident[],
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if (sized_augmentation)
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{
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/* Skip FDE address encoding byte. */
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- encoding = *bytes++;
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+ bytes++;
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continue;
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}
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break;
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commit 52a6a3110e019d696284fdd822c2a2f0987dded2
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Author: Mark Wielaard <mark@klomp.org>
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Date: Thu Nov 3 13:52:32 2022 +0100
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readelf: Check gelf_getdyn doesn't return NULL
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Signed-off-by: Mark Wielaard <mark@klomp.org>
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diff --git a/src/readelf.c b/src/readelf.c
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index e721a209..3dafb041 100644
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--- a/src/readelf.c
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+++ b/src/readelf.c
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@@ -4910,7 +4910,7 @@ get_dynscn_addrs(Elf *elf, GElf_Phdr *phdr, GElf_Addr addrs[i_max])
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GElf_Dyn dyn_mem;
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GElf_Dyn *dyn = gelf_getdyn(data, dyn_idx, &dyn_mem);
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/* DT_NULL Marks end of dynamic section. */
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- if (dyn->d_tag == DT_NULL)
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+ if (dyn == NULL || dyn->d_tag == DT_NULL)
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break;
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switch (dyn->d_tag) {
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