lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-08-05 19:35:52 +03:00
Code Activity

Add GLIBC_ABI_DT_RELR for DT_RELR support

Browse Source 
The EI_ABIVERSION field of the ELF header in executables and shared
libraries can be bumped to indicate the minimum ABI requirement on the
dynamic linker.  However, EI_ABIVERSION in executables isn't checked by
the Linux kernel ELF loader nor the existing dynamic linker.  Executables
will crash mysteriously if the dynamic linker doesn't support the ABI
features required by the EI_ABIVERSION field.  The dynamic linker should
be changed to check EI_ABIVERSION in executables.

Add a glibc version, GLIBC_ABI_DT_RELR, to indicate DT_RELR support so
that the existing dynamic linkers will issue an error on executables with
GLIBC_ABI_DT_RELR dependency.  When there is a DT_VERNEED entry with
libc.so on DT_NEEDED, issue an error if there is a DT_RELR entry without
GLIBC_ABI_DT_RELR dependency.

Support __placeholder_only_for_empty_version_map as the placeholder symbol
used only for empty version map to generate GLIBC_ABI_DT_RELR without any
symbols.
This commit is contained in:
H.J. Lu
2021-11-19 06:18:56 -08:00
parent 4610b24f5e
commit 57292f5741
6 changed files with 60 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
scripts/abilist.awk
View File

@@ -55,6 +55,8 @@ $2 == "g" || $2 == "w" && (NF == 7 || NF == 8) {
# caused STV_HIDDEN symbols to appear in .dynsym, though that is useless.
if (NF > 7 && $7 == ".hidden") next;
if (version ~ /^GLIBC_ABI_/ && !include_abi_version) next;
if (version == "GLIBC_PRIVATE" && !include_private) next;
desc = "";