https://sourceware.org/bugzilla/show_bug.cgi?id=29319
Bug ID: 29319
Summary: [binutils] strip changes align of GNU_STACK segment
Product: binutils
Version: 2.39 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Created attachment 14194
--> https://sourceware.org/bugzilla/attachment.cgi?id=14194&action=edit
gcore-relro-pie.gz
Consider the exec gcore-relro-pie (exec generated by the gdb testsuite), on
which we use strip:
...
$ strip -g -o gcore-relro-pie.stripped gcore-relro-pie
...
The align for the GNU_STACK segment drops from 16 to 8:
...
$ readelf -l -W gcore-relro-pie | egrep "GNU_STACK|Type"
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
$ readelf -l -W gcore-relro-pie.stripped | egrep "GNU_STACK|Type"
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x8
...
This mismatch causes gdb to classify gcore-relro-pie as unsuitable to combine
with a core file generated using gcore-relro-pie.stripped (PR29318).
Binutils needs to be build with --disable-separate-code in order to trigger
this.
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