Commit 5d8591bc authored by Rabin Vincent's avatar Rabin Vincent Committed by Rusty Russell

module: set ksymtab/kcrctab* section addresses to 0x0

These __ksymtab*/__kcrctab* sections currently have non-zero addresses.
Non-zero section addresses in a relocatable ELF confuse GDB and it ends
up not relocating all symbols when add-symbol-file is used on modules
which have exports.  The kernel's module loader does not care about
these addresses, so let's just set them to zero.

 Before:

  $ readelf -S lib/notifier-error-inject.ko   | grep 'Name\| __ksymtab_gpl'
    [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
    [ 8] __ksymtab_gpl     PROGBITS        0000000c 0001b4 000010 00   A  0   0  4

  (gdb) add-symbol-file lib/notifier-error-inject.ko 0x500000 -s .bss 0x700000
  add symbol table from file "lib/notifier-error-inject.ko" at
     .text_addr = 0x500000
     .bss_addr = 0x700000
  (gdb) p &notifier_err_inject_dir
  $3 = (struct dentry **) 0x0

 After:

  $ readelf -S lib/notifier-error-inject.ko   | grep 'Name\| __ksymtab_gpl'
    [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
    [ 8] __ksymtab_gpl     PROGBITS        00000000 0001b4 000010 00   A  0   0  4

  (gdb) add-symbol-file lib/notifier-error-inject.ko 0x500000 -s .bss 0x700000
  add symbol table from file "lib/notifier-error-inject.ko" at
     .text_addr = 0x500000
     .bss_addr = 0x700000
  (gdb) p &notifier_err_inject_dir
  $3 = (struct dentry **) 0x700000
Signed-off-by: default avatarRabin Vincent <rabin.vincent@axis.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent f8de05ca
...@@ -6,14 +6,14 @@ ...@@ -6,14 +6,14 @@
SECTIONS { SECTIONS {
/DISCARD/ : { *(.discard) } /DISCARD/ : { *(.discard) }
__ksymtab : { *(SORT(___ksymtab+*)) } __ksymtab 0 : { *(SORT(___ksymtab+*)) }
__ksymtab_gpl : { *(SORT(___ksymtab_gpl+*)) } __ksymtab_gpl 0 : { *(SORT(___ksymtab_gpl+*)) }
__ksymtab_unused : { *(SORT(___ksymtab_unused+*)) } __ksymtab_unused 0 : { *(SORT(___ksymtab_unused+*)) }
__ksymtab_unused_gpl : { *(SORT(___ksymtab_unused_gpl+*)) } __ksymtab_unused_gpl 0 : { *(SORT(___ksymtab_unused_gpl+*)) }
__ksymtab_gpl_future : { *(SORT(___ksymtab_gpl_future+*)) } __ksymtab_gpl_future 0 : { *(SORT(___ksymtab_gpl_future+*)) }
__kcrctab : { *(SORT(___kcrctab+*)) } __kcrctab 0 : { *(SORT(___kcrctab+*)) }
__kcrctab_gpl : { *(SORT(___kcrctab_gpl+*)) } __kcrctab_gpl 0 : { *(SORT(___kcrctab_gpl+*)) }
__kcrctab_unused : { *(SORT(___kcrctab_unused+*)) } __kcrctab_unused 0 : { *(SORT(___kcrctab_unused+*)) }
__kcrctab_unused_gpl : { *(SORT(___kcrctab_unused_gpl+*)) } __kcrctab_unused_gpl 0 : { *(SORT(___kcrctab_unused_gpl+*)) }
__kcrctab_gpl_future : { *(SORT(___kcrctab_gpl_future+*)) } __kcrctab_gpl_future 0 : { *(SORT(___kcrctab_gpl_future+*)) }
} }
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment