https://sourceware.org/bugzilla/show_bug.cgi?id=22842
Bug ID: 22842
Summary: Handling of R_X86_64_PC32 in a PIE against a function
in a shared library could be better
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: rafael.espindola at gmail dot com
CC: ccoutant at gmail dot com, hjl.tools at gmail dot com
Target Milestone: ---
Created attachment 10815
--> https://sourceware.org/bugzilla/attachment.cgi?id=10815&action=edit
testcase
The attached testcase has a shared library that defines a function foo with
default visibility. The function just prints its own address and argument:
void foo(void *bar) {
printf("%p %p\n", bar, foo);
}
There is also a position independent executable that uses a R_X86_64_PC32 to
find the address of foo and call it with that value.
The expected result is to see the same value printed twice.
If we try to use gold it errors out when linking the executable:
error: test.o: requires dynamic R_X86_64_PC32 reloc against 'foo' which may
overflow at runtime; recompile with -fPIC
With ld.bfd it links but fails at runtime:
./test: Symbol `foo' causes overflow in R_X86_64_PC32 relocation
0x55ae794c62d0 0x7f0b794c62d0
With lld it works since lld create a canonical plt entry for foo in the main
executable:
6: 00000000000011f0 0 FUNC GLOBAL DEFAULT UND foo
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