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zdump: check provided sizes for reasonableness

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Check the dump provided sizes for reasonableness. This avoids that a
corrupted dump leads to allocation of large buffers on the heap.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Marc Hartmayer
2022-11-09 19:27:48 +00:00
committed by Jan Höppner
parent f4ed0b0ec6
commit 1911cba130
4 changed files with 38 additions and 8 deletions
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zdump/df_elf.h
+4 -2
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@@ -195,7 +195,8 @@ Elf64_Shdr *read_elf_shdrs(const struct zg_fh *fh, const Elf64_Ehdr *ehdr,
*
* To read the section content the offset of @fh is changed.
*/
unsigned char *read_elf_section_data(const struct zg_fh *fh, const Elf64_Shdr *shdr, size_t *size);
unsigned char *read_elf_section_data(const struct zg_fh *fh, const Elf64_Shdr *shdr, size_t *size,
const size_t max_size);
/*
* Read ELF section header string table
@@ -203,7 +204,8 @@ unsigned char *read_elf_section_data(const struct zg_fh *fh, const Elf64_Shdr *s
* To read the section header string table the offset of @fh is changed.
*/
char *read_elf_shstrtab(const struct zg_fh *fh, const Elf64_Ehdr *ehdr, const Elf64_Shdr *shdrs,
const unsigned int shnum, size_t *shstrtab_size);
const unsigned int shnum, size_t *shstrtab_size,
const size_t max_shstrtab_size);
/*
* Find ELF section header by section name