This is a note to let you know that I've just added the patch titled
build-id: require program headers to be right after ELF header
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
build-id-require-program-headers-to-be-right-after-e.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit addfa88a98a87ad451163f800f13124712f02b0c
Author: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Date: Fri Jun 21 21:39:33 2024 +0300
build-id: require program headers to be right after ELF header
[ Upstream commit 961a2851324561caed579764ffbee3db82b32829 ]
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@xxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Stable-dep-of: 905415ff3ffb ("lib/buildid: harden build ID parsing logic")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/lib/buildid.c b/lib/buildid.c
index dfc62625cae4e..493537344fc81 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))
