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Commit 826ba17e authored by Andreas Schwab's avatar Andreas Schwab
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(unexec): Handle unaligned bss offset.

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src/ChangeLog
View file @ 826ba17e
2009-02-02 Andreas Schwab <schwab@suse.de>
* unexelf.c (unexec): Handle unaligned bss offset.
2009-02-01 Adrian Robert <Adrian.B.Robert@gmail.com>
* nsterm.m (ns_read_socket): Copy 2009-01-29 and 2009-01-30
......
src/unexelf.c
View file @ 826ba17e
......@@ -27,8 +27,8 @@ what you give them. Help stamp out software-hoarding! */
* unexec.c - Convert a running program into an a.out file.
*
* Author: Spencer W. Thomas
* Computer Science Dept.
* University of Utah
* Computer Science Dept.
* University of Utah
* Date: Tue Mar 2 1982
* Modified heavily since then.
*
......@@ -680,6 +680,8 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
ElfW(Word) old_bss_size, new_data2_size;
ElfW(Off) new_data2_offset;
ElfW(Addr) new_data2_addr;
ElfW(Off) old_bss_offset;
ElfW(Word) new_data2_incr;
int n, nn;
int old_bss_index, old_sbss_index, old_plt_index;
......@@ -754,6 +756,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
{
old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_bss_index).sh_offset;
new_data2_index = old_bss_index;
}
else if (old_plt_index != -1
......@@ -766,6 +769,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
+ OLD_SECTION_H (old_plt_index).sh_size;
if (old_sbss_index != -1)
old_bss_size += OLD_SECTION_H (old_sbss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_plt_index).sh_offset;
new_data2_index = old_plt_index;
}
else
......@@ -773,6 +777,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
+ OLD_SECTION_H (old_sbss_index).sh_size;
old_bss_offset = OLD_SECTION_H (old_sbss_index).sh_offset;
new_data2_index = old_sbss_index;
}
......@@ -789,17 +794,24 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
#endif
new_data2_addr = old_bss_addr;
new_data2_size = new_bss_addr - old_bss_addr;
new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
(new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset
+ (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
/* This is the amount by which the sections following the bss sections
must be shifted in the image. It can differ from new_data2_size if
the end of the old .data section (and thus the offset of the .bss
section) was unaligned. */
new_data2_incr = new_data2_size + (new_data2_offset - old_bss_offset);
#ifdef DEBUG
fprintf (stderr, "old_bss_index %d\n", old_bss_index);
fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
fprintf (stderr, "old_bss_size %x\n", old_bss_size);
fprintf (stderr, "old_bss_offset %x\n", old_bss_offset);
fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
fprintf (stderr, "new_data2_size %x\n", new_data2_size);
fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
fprintf (stderr, "new_data2_incr %x\n", new_data2_incr);
#endif
if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
......@@ -813,7 +825,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
if (new_file < 0)
fatal ("Can't creat (%s): errno %d\n", new_name, errno);
new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_incr;
if (ftruncate (new_file, new_file_size))
fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
......@@ -826,7 +838,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
new_file_h = (ElfW(Ehdr) *) new_base;
new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
new_section_h = (ElfW(Shdr) *)
((byte *) new_base + old_file_h->e_shoff + new_data2_size);
((byte *) new_base + old_file_h->e_shoff + new_data2_incr);
/* Make our new file, program and section headers as copies of the
originals. */
......@@ -841,7 +853,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
/* Fix up file header. We'll add one section. Section header is
further away now. */
new_file_h->e_shoff += new_data2_size;
new_file_h->e_shoff += new_data2_incr;
new_file_h->e_shnum += 1;
#ifdef DEBUG
......@@ -901,7 +913,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
NEW_PROGRAM_H (n).p_offset += new_data2_size;
NEW_PROGRAM_H (n).p_offset += new_data2_incr;
}
#endif
......@@ -957,10 +969,8 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
)
{
/* NN should be `old_s?bss_index + 1' at this point. */
NEW_SECTION_H (nn).sh_offset =
NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
NEW_SECTION_H (nn).sh_addr =
NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
NEW_SECTION_H (nn).sh_offset = new_data2_offset + new_data2_size;
NEW_SECTION_H (nn).sh_addr = new_data2_addr + new_data2_size;
/* Let the new bss section address alignment be the same as the
section address alignment followed the old bss section, so
this section will be placed in exactly the same place. */
......@@ -970,16 +980,15 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
else
{
/* Any section that was originally placed after the .bss
section should now be off by NEW_DATA2_SIZE. If a
section should now be off by NEW_DATA2_INCR. If a
section overlaps the .bss section, consider it to be
placed after the .bss section. Overlap can occur if the
section just before .bss has less-strict alignment; this
was observed between .symtab and .bss on Solaris 2.5.1
(sparc) with GCC snapshot 960602. */
if (NEW_SECTION_H (nn).sh_offset + NEW_SECTION_H (nn).sh_size
> new_data2_offset)
NEW_SECTION_H (nn).sh_offset += new_data2_size;
if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset)
NEW_SECTION_H (nn).sh_offset += new_data2_incr;
/* Any section that was originally placed after the section
header table should now be off by the size of one section
......@@ -1084,7 +1093,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
#if defined (_SYSTYPE_SYSV)
if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
&& old_mdebug_index != -1)
{
{
int diff = NEW_SECTION_H(nn).sh_offset
- OLD_SECTION_H(old_mdebug_index).sh_offset;
HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
......
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