You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.9 KiB
82 lines
2.9 KiB
commit cb19cef087eaa551568739aa5b59cf97b8d5da1e
|
|
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
|
|
Date: Tue Jul 16 07:57:45 2024 -0300
|
|
|
|
elf: Fix localplt.awk for DT_RELR-enabled builds (BZ 31978)
|
|
|
|
For each input readelf output, localplt.awk parses each 'Relocation
|
|
section' entry, checks its offset against the dynamic section entry, and
|
|
saves each DT_JMPREL, DT_RELA, and DT_REL offset value it finds. After
|
|
all lines are read, the script checks if any segment offset differed
|
|
from 0, meaning at least one 'Relocation section' was matched.
|
|
|
|
However, if the shared object was built with RELR support and the static
|
|
linker could place all the relocation on DT_RELR, there would be no
|
|
DT_JMPREL, DT_RELA, and DT_REL entries; only a DT_RELR.
|
|
|
|
For the current three ABIs that support (aarch64, x86, and powerpc64),
|
|
the powerpc64 ld.so shows the behavior above. Both x86_64 and aarch64
|
|
show extra relocations on '.rela.dyn', which makes the script check to
|
|
succeed.
|
|
|
|
This patch fixes by handling DT_RELR, where the offset is checked
|
|
against the dynamic section entries and if the shared object contains an
|
|
entry it means that there are no extra PLT entries (since all
|
|
relocations are relative).
|
|
|
|
It fixes the elf/check-localplt failure on powerpc.
|
|
|
|
Checked with a build/check for aarch64-linux-gnu, x86_64-linux-gnu,
|
|
i686-linux-gnu, arm-linux-gnueabihf, s390x-linux-gnu, powerpc-linux-gnu,
|
|
powerpc64-linux-gnu, and powerpc64le-linux-gnu.
|
|
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
|
|
|
|
(cherry picked from commit 4f047d9edecb1a9b796a9a904dcd42bd3cc3d3b6)
|
|
|
|
diff --git a/scripts/localplt.awk b/scripts/localplt.awk
|
|
index fe79ca01abcb1a75..621ae7d8e815a4e5 100644
|
|
--- a/scripts/localplt.awk
|
|
+++ b/scripts/localplt.awk
|
|
@@ -10,7 +10,8 @@ BEGIN {
|
|
}
|
|
|
|
FILENAME != lastfile {
|
|
- if (lastfile && jmprel_offset == 0 && rela_offset == 0 && rel_offset == 0) {
|
|
+ if (lastfile && jmprel_offset == 0 && rela_offset == 0 && rel_offset == 0 \
|
|
+ && relr_offset == 0) {
|
|
print FILENAME ": *** failed to find expected output (readelf -WSdr)";
|
|
result = 2;
|
|
}
|
|
@@ -22,6 +23,7 @@ FILENAME != lastfile {
|
|
jmprel_offset = 0;
|
|
rela_offset = 0;
|
|
rel_offset = 0;
|
|
+ relr_offset = 0;
|
|
pltrelsz = -1;
|
|
delete section_offset_by_address;
|
|
}
|
|
@@ -77,6 +79,8 @@ in_relocs && relocs_offset == rel_offset && NF >= 5 {
|
|
}
|
|
}
|
|
|
|
+# No need to handle DT_RELR (all packed relocations are relative).
|
|
+
|
|
in_relocs { next }
|
|
|
|
$1 == "Relocation" && $2 == "section" && $5 == "offset" {
|
|
@@ -121,4 +125,14 @@ $2 == "(REL)" {
|
|
}
|
|
next
|
|
}
|
|
+
|
|
+$2 == "(RELR)" {
|
|
+ relr_addr = strtonum($3);
|
|
+ if (relr_addr in section_offset_by_address) {
|
|
+ relr_offset = section_offset_by_address[relr_addr];
|
|
+ } else {
|
|
+ print FILENAME ": *** DT_RELR does not match any section's address";
|
|
+ result = 2;
|
|
+ }
|
|
+}
|
|
END { exit(result) }
|