https://sourceware.org/bugzilla/show_bug.cgi?id=24643
Bug ID: 24643
Summary: arm/aarch64: SEGV in objdump -ld for static programs
with split out debug symbols
Product: binutils
Version: 2.33 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: adam at os dot inf.tu-dresden.de
Target Milestone: ---
Created attachment 11816
--> https://sourceware.org/bugzilla/attachment.cgi?id=11816&action=edit
Patch to fix segfault
Hi,
objdump segfaults when using split out debug symbols and static programs on arm
and aarch64:
$ cat sh.sh
echo 'int main() { return 0; }' > foo.c
set -x
aarch64-linux-gnu-gcc -static -o foo-arm64 foo.c
objcopy --only-keep-debug foo-arm64 foo-arm64.debug
objcopy --strip-unneeded foo-arm64
objcopy --add-gnu-debuglink=foo-arm64.debug foo-arm64
objdump -ld foo-arm64
arm-linux-gnueabihf-gcc -static -o foo-arm32 foo.c
objcopy --only-keep-debug foo-arm32 foo-arm32.debug
objcopy --strip-unneeded foo-arm32
objcopy --add-gnu-debuglink=foo-arm32.debug foo-arm32
objdump -ld foo-arm32
$ sh sh.sh
+ aarch64-linux-gnu-gcc -static -o foo-arm64 foo.c
+ objcopy --only-keep-debug foo-arm64 foo-arm64.debug
+ objcopy --strip-unneeded foo-arm64
+ objcopy --add-gnu-debuglink=foo-arm64.debug foo-arm64
+ objdump -ld foo-arm64
foo-arm64: file format elf64-littleaarch64
Disassembly of section .init:
00000000004001d8 <.init>:
sh.sh: line 7: 31282 Segmentation fault objdump -ld foo-arm64
+ arm-linux-gnueabihf-gcc -static -o foo-arm32 foo.c
+ objcopy --only-keep-debug foo-arm32 foo-arm32.debug
+ objcopy --strip-unneeded foo-arm32
+ objcopy --add-gnu-debuglink=foo-arm32.debug foo-arm32
+ objdump -ld foo-arm32
foo-arm32: file format elf32-littlearm
Disassembly of section .init:
00010140 <.init>:
sh.sh: line 13: 31291 Segmentation fault objdump -ld foo-arm32
$
Problem seems to be that aarch64_elf_find_function/arm_elf_find_function get
their symbols argument with NULL which the function is not prepared to handle.
Adding a check for NULL makes it work, see attached patch.
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