https://sourceware.org/bugzilla/show_bug.cgi?id=22844
Bug ID: 22844
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: gold
Assignee: ccoutant at gmail dot com
Reporter: rafael.espindola at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
Created attachment 10817
--> https://sourceware.org/bugzilla/attachment.cgi?id=10817&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 after 1031c264fd23641111df1e12a35d0a8f7e82fb80 or ld.lld it works
since a canonical plt entry for foo is created in the main executable:
6: 00000000000011f0 0 FUNC GLOBAL DEFAULT UND foo
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