diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-03-08 12:55:29 -0600 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-03-08 12:55:29 -0600 |
| commit | 95c5436a4883841588dae86fb0b9325f47ba5ad3 (patch) | |
| tree | a6d8fa5165899d8c8cfd905784f1065e69249c21 /fs/binfmt_elf.c | |
| parent | a99a3e2efaf1f4454eb5c9176f47e66de075b134 (diff) | |
coredump: Snapshot the vmas in do_coredump
Move the call of dump_vma_snapshot and kvfree(vma_meta) out of the
individual coredump routines into do_coredump itself. This makes
the code less error prone and easier to maintain.
Make the vma snapshot available to the coredump routines
in struct coredump_params. This makes it easier to
change and update what is captures in the vma snapshot
and will be needed for fixing fill_file_notes.
Reviewed-by: Jann Horn <jannh@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index eaf39b1bdbbb..5710467cf4b6 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -2191,8 +2191,7 @@ static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, static int elf_core_dump(struct coredump_params *cprm) { int has_dumped = 0; - int vma_count, segs, i; - size_t vma_data_size; + int segs, i; struct elfhdr elf; loff_t offset = 0, dataoff; struct elf_note_info info = { }; @@ -2200,16 +2199,12 @@ static int elf_core_dump(struct coredump_params *cprm) struct elf_shdr *shdr4extnum = NULL; Elf_Half e_phnum; elf_addr_t e_shoff; - struct core_vma_metadata *vma_meta; - - if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size)) - return 0; /* * The number of segs are recored into ELF header as 16bit value. * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. */ - segs = vma_count + elf_core_extra_phdrs(); + segs = cprm->vma_count + elf_core_extra_phdrs(); /* for notes section */ segs++; @@ -2248,7 +2243,7 @@ static int elf_core_dump(struct coredump_params *cprm) dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); - offset += vma_data_size; + offset += cprm->vma_data_size; offset += elf_core_extra_data_size(); e_shoff = offset; @@ -2268,8 +2263,8 @@ static int elf_core_dump(struct coredump_params *cprm) goto end_coredump; /* Write program headers for segments dump */ - for (i = 0; i < vma_count; i++) { - struct core_vma_metadata *meta = vma_meta + i; + for (i = 0; i < cprm->vma_count; i++) { + struct core_vma_metadata *meta = cprm->vma_meta + i; struct elf_phdr phdr; phdr.p_type = PT_LOAD; @@ -2306,8 +2301,8 @@ static int elf_core_dump(struct coredump_params *cprm) /* Align to page */ dump_skip_to(cprm, dataoff); - for (i = 0; i < vma_count; i++) { - struct core_vma_metadata *meta = vma_meta + i; + for (i = 0; i < cprm->vma_count; i++) { + struct core_vma_metadata *meta = cprm->vma_meta + i; if (!dump_user_range(cprm, meta->start, meta->dump_size)) goto end_coredump; @@ -2324,7 +2319,6 @@ static int elf_core_dump(struct coredump_params *cprm) end_coredump: free_note_info(&info); kfree(shdr4extnum); - kvfree(vma_meta); kfree(phdr4note); return has_dumped; } |