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| author | H.J. Lu <hjl.tools@gmail.com> | 2022-02-15 06:57:11 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2022-02-21 07:57:18 -0800 |
| commit | 2c0915cbf570cb9c8a65f1d20a55c5a7238e5b63 (patch) | |
| tree | c82915454d6d93b8ad59acee9ae738536c3e4fc8 | |
| parent | 949ad78a189194048df8a253bb31d1d11d919044 (diff) | |
| download | glibc-2c0915cbf570cb9c8a65f1d20a55c5a7238e5b63.zip glibc-2c0915cbf570cb9c8a65f1d20a55c5a7238e5b63.tar.gz glibc-2c0915cbf570cb9c8a65f1d20a55c5a7238e5b63.tar.bz2 | |
elf: Check invalid hole in PT_LOAD segments [BZ #28838]
Changes in v2:
1. Update commit log.
commit 163f625cf9becbb82dfec63a29e566324129c0cd
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Dec 21 12:35:47 2021 -0800
elf: Remove excessive p_align check on PT_LOAD segments [BZ #28688]
removed the p_align check against the page size. It caused the loader
error or crash on elf/tst-p_align3 when loading elf/tst-p_alignmod3.so,
which has the invalid p_align in PT_LOAD segments, added by
commit d8d94863ef125a392b929732b37e07dc927fbcd1
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Dec 21 13:42:28 2021 -0800
The loader failure caused by a negative length passed to __mprotect is
random, depending on architecture and toolchain. Update _dl_map_segments
to detect invalid holes. This fixes BZ #28838.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
| -rw-r--r-- | elf/dl-map-segments.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/elf/dl-map-segments.h b/elf/dl-map-segments.h index b3513e7..024175b 100644 --- a/elf/dl-map-segments.h +++ b/elf/dl-map-segments.h @@ -112,6 +112,9 @@ _dl_map_segments (struct link_map *l, int fd, unallocated. Then jump into the normal segment-mapping loop to handle the portion of the segment past the end of the file mapping. */ + if (__glibc_unlikely (loadcmds[nloadcmds - 1].mapstart < + c->mapend)) + return N_("ELF load command address/offset not page-aligned"); if (__glibc_unlikely (__mprotect ((caddr_t) (l->l_addr + c->mapend), loadcmds[nloadcmds - 1].mapstart - c->mapend, |