Re: [PATCH] libelf: check decompressed ZSTD size
Hi Aleksei, On Thu, Nov 23, 2023 at 03:31:47PM +, Aleksei Vetrov wrote: > Decompression functions like __libelf_decompress_zlib check that > decompressed data has the same size as it was declared in the header > (size_out argument). The same check is now added to > __libelf_decompress_zstd to make sure that the whole allocated buffer is > initialized. > > * libelf/elf_compress.c (__libelf_decompress_zstd): Use return value > of ZSTD_decompress to check that decompressed data size is the > same as size_out of the buffer that was allocated. Thanks, this makes sense. If the decompressed size isn't what was encoded in the Chdr then we could reduce the size of the d_buf/d_size, but that probably is not what the user expects. Flagging it as bad/inconsistent data makes sense. Especially since we do the same for zlib compressed data. Pushed, Mark
[PATCH] libelf: check decompressed ZSTD size
Decompression functions like __libelf_decompress_zlib check that decompressed data has the same size as it was declared in the header (size_out argument). The same check is now added to __libelf_decompress_zstd to make sure that the whole allocated buffer is initialized. * libelf/elf_compress.c (__libelf_decompress_zstd): Use return value of ZSTD_decompress to check that decompressed data size is the same as size_out of the buffer that was allocated. Signed-off-by: Aleksei Vetrov --- libelf/elf_compress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libelf/elf_compress.c b/libelf/elf_compress.c index c7283c6a..0ad6a32a 100644 --- a/libelf/elf_compress.c +++ b/libelf/elf_compress.c @@ -422,7 +422,7 @@ __libelf_decompress_zstd (void *buf_in, size_t size_in, size_t size_out) } size_t ret = ZSTD_decompress (buf_out, size_out, buf_in, size_in); - if (ZSTD_isError (ret)) + if (unlikely (ZSTD_isError (ret)) || unlikely (ret != size_out)) { free (buf_out); __libelf_seterrno (ELF_E_DECOMPRESS_ERROR); -- 2.43.0.rc1.413.gea7ed67945-goog
[Bug general/30975] elfutils incorrectly reports core files with non-contiguous segments
https://sourceware.org/bugzilla/show_bug.cgi?id=30975 --- Comment #7 from Aaron Merey --- (In reply to Pablo Galindo Salgado from comment #6) > Hi, I can confirm that this indeed fixes the issue. Thanks to everyone > involved. Fantastic work! Thanks Pablo, glad to hear! -- You are receiving this mail because: You are on the CC list for the bug.
[Bug general/30975] elfutils incorrectly reports core files with non-contiguous segments
https://sourceware.org/bugzilla/show_bug.cgi?id=30975 --- Comment #6 from Pablo Galindo Salgado --- Hi, I can confirm that this indeed fixes the issue. Thanks to everyone involved. Fantastic work! -- You are receiving this mail because: You are on the CC list for the bug.