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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2024-06-21 21:39:33 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-06-28 19:36:30 -0700 |
| commit | 961a2851324561caed579764ffbee3db82b32829 (patch) | |
| tree | 7575bd1e2f612067e1ae7bccc2c0add96833caee /lib | |
| parent | 6073496a20c5e2e8eee63c50af4b30fb2f521643 (diff) | |
| download | linux-stable-961a2851324561caed579764ffbee3db82b32829.tar.gz linux-stable-961a2851324561caed579764ffbee3db82b32829.tar.bz2 linux-stable-961a2851324561caed579764ffbee3db82b32829.zip | |
build-id: require program headers to be right after ELF header
Neither ELF spec not ELF loader require program header to be placed right
after ELF header, but build-id code very much assumes such placement:
See
find_get_page(vma->vm_file->f_mapping, 0);
line and checks against PAGE_SIZE.
Returns errors for now until someone rewrites build-id parser
to be more inline with load_elf_binary().
Link: https://lkml.kernel.org/r/d58bc281-6ca7-467a-9a64-40fa214bd63e@p183
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/buildid.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/buildid.c b/lib/buildid.c index 7954dd92e36c..e02b5507418b 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -73,6 +73,13 @@ static int get_build_id_32(const void *page_addr, unsigned char *build_id, Elf32_Phdr *phdr; int i; + /* + * FIXME + * Neither ELF spec nor ELF loader require that program headers + * start immediately after ELF header. + */ + if (ehdr->e_phoff != sizeof(Elf32_Ehdr)) + return -EINVAL; /* only supports phdr that fits in one page */ if (ehdr->e_phnum > (PAGE_SIZE - sizeof(Elf32_Ehdr)) / sizeof(Elf32_Phdr)) @@ -98,6 +105,13 @@ static int get_build_id_64(const void *page_addr, unsigned char *build_id, Elf64_Phdr *phdr; int i; + /* + * FIXME + * Neither ELF spec nor ELF loader require that program headers + * start immediately after ELF header. + */ + if (ehdr->e_phoff != sizeof(Elf64_Ehdr)) + return -EINVAL; /* only supports phdr that fits in one page */ if (ehdr->e_phnum > (PAGE_SIZE - sizeof(Elf64_Ehdr)) / sizeof(Elf64_Phdr)) |