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authorFangrui Song <maskray@google.com>2023-05-12 04:25:28 +0200
committerKees Cook <keescook@chromium.org>2023-05-16 23:32:00 +0200
commit60592fb6b67c653beaa2e7acad9a9d7aa0b71dff (patch)
tree27f14ecfcbf21dd70c09f2b27764a0c38a1eacd0 /fs/binfmt_elf.c
parentLinux 6.4-rc2 (diff)
downloadlinux-60592fb6b67c653beaa2e7acad9a9d7aa0b71dff.tar.xz
linux-60592fb6b67c653beaa2e7acad9a9d7aa0b71dff.zip
coredump, vmcore: Set p_align to 4 for PT_NOTE
Tools like readelf/llvm-readelf use p_align to parse a PT_NOTE program header as an array of 4-byte entries or 8-byte entries. Currently, there are workarounds[1] in place for Linux to treat p_align==0 as 4. However, it would be more appropriate to set the correct alignment so that tools do not have to rely on guesswork. FreeBSD coredumps set p_align to 4 as well. [1]: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=82ed9683ec099d8205dc499ac84febc975235af6 [2]: https://reviews.llvm.org/D150022 Signed-off-by: Fangrui Song <maskray@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20230512022528.3430327-1-maskray@google.com
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 1033fbdfdbec..44b4c42ab8e8 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1517,7 +1517,7 @@ static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
phdr->p_filesz = sz;
phdr->p_memsz = 0;
phdr->p_flags = 0;
- phdr->p_align = 0;
+ phdr->p_align = 4;
}
static void fill_note(struct memelfnote *note, const char *name, int type,