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elfcompress: Replace cleanup() with label

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This unifies the error handling with the rest of the code base and gets
rid of a nested function.

Signed-off-by: Timm Bäder <tbaeder@redhat.com>
This commit is contained in:
Timm Bäder
2021-03-02 09:05:33 +01:00
committed by Mark Wielaard
parent d6c85cff9d
commit c497478390
2 changed files with 112 additions and 109 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/ChangeLog
+6
View File
@@ -1,3 +1,9 @@
2021-03-02 Timm Bäder <tbaeder@redhat.com>
* elfcompress.c (process_file): Remove cleanup() function and
replace it with a cleanup label at the end of the function.
Initialize res to -1.
2021-02-17 Timm Bäder <tbaeder@redhat.com>
* elfcompress.c (process_file): Move get_sections function...
src/elfcompress.c
+106 -109
View File
@@ -298,47 +298,13 @@ process_file (const char *fname)
/* How many sections are we talking about? */
size_t shnum = 0;
int cleanup (int res)
{
elf_end (elf);
close (fd);
elf_end (elfnew);
close (fdnew);
if (fnew != NULL)
{
unlink (fnew);
free (fnew);
fnew = NULL;
}
free (snamebuf);
if (names != NULL)
{
dwelf_strtab_free (names);
free (scnstrents);
free (symstrents);
free (namesbuf);
if (scnnames != NULL)
{
for (size_t n = 0; n < shnum; n++)
free (scnnames[n]);
free (scnnames);
}
}
free (sections);
return res;
}
int res = -1;
fd = open (fname, O_RDONLY);
if (fd < 0)
{
error (0, errno, "Couldn't open %s\n", fname);
return cleanup (-1);
goto cleanup;
}
elf = elf_begin (fd, ELF_C_READ, NULL);
@@ -346,7 +312,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't open ELF file %s for reading: %s",
fname, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* We don't handle ar files (or anything else), we probably should. */
@@ -357,21 +323,21 @@ process_file (const char *fname)
error (0, 0, "Cannot handle ar files: %s", fname);
else
error (0, 0, "Unknown file type: %s", fname);
return cleanup (-1);
goto cleanup;
}
struct stat st;
if (fstat (fd, &st) != 0)
{
error (0, errno, "Couldn't fstat %s", fname);
return cleanup (-1);
goto cleanup;
}
GElf_Ehdr ehdr;
if (gelf_getehdr (elf, &ehdr) == NULL)
{
error (0, 0, "Couldn't get ehdr for %s: %s", fname, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Get the section header string table. */
@@ -380,7 +346,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get section header string table index in %s: %s",
fname, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* How many sections are we talking about? */
@@ -388,13 +354,13 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get number of sections in %s: %s",
fname, elf_errmsg (1));
return cleanup (-1);
goto cleanup;
}
if (shnum == 0)
{
error (0, 0, "ELF file %s has no sections", fname);
return cleanup (-1);
goto cleanup;
}
sections = xcalloc (shnum / 8 + 1, sizeof (unsigned int));
@@ -403,7 +369,7 @@ process_file (const char *fname)
if (elf_getphdrnum (elf, &phnum) != 0)
{
error (0, 0, "Couldn't get phdrnum: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Whether we need to adjust any section names (going to/from GNU
@@ -460,7 +426,7 @@ process_file (const char *fname)
{
error (0, 0, "Unexpected section number %zd, expected only %zd",
ndx, shnum);
cleanup (-1);
goto cleanup;
}
GElf_Shdr shdr_mem;
@@ -468,14 +434,14 @@ process_file (const char *fname)
if (shdr == NULL)
{
error (0, 0, "Couldn't get shdr for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
const char *sname = elf_strptr (elf, shdrstrndx, shdr->sh_name);
if (sname == NULL)
{
error (0, 0, "Couldn't get name for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
if (section_name_matches (sname))
@@ -536,7 +502,7 @@ process_file (const char *fname)
{
error (0, 0,
"Multiple symbol tables (%zd, %zd) using the same string table unsupported", symtabndx, ndx);
return cleanup (-1);
goto cleanup;
}
symtabndx = ndx;
}
@@ -558,7 +524,7 @@ process_file (const char *fname)
if (verbose > 0)
printf ("Nothing to do.\n");
fnew = NULL;
return cleanup (0);
goto cleanup;
}
if (adjust_names)
@@ -567,7 +533,7 @@ process_file (const char *fname)
if (names == NULL)
{
error (0, 0, "Not enough memory for new strtab");
return cleanup (-1);
goto cleanup;
}
scnstrents = xmalloc (shnum
* sizeof (Dwelf_Strent *));
@@ -594,7 +560,7 @@ process_file (const char *fname)
/* Since we didn't create it we don't want to try to unlink it. */
free (fnew);
fnew = NULL;
return cleanup (-1);
goto cleanup;
}
elfnew = elf_begin (fdnew, ELF_C_WRITE, NULL);
@@ -602,21 +568,21 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't open new ELF %s for writing: %s",
fnew, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Create the new ELF header and copy over all the data. */
if (gelf_newehdr (elfnew, gelf_getclass (elf)) == 0)
{
error (0, 0, "Couldn't create new ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
GElf_Ehdr newehdr;
if (gelf_getehdr (elfnew, &newehdr) == NULL)
{
error (0, 0, "Couldn't get new ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
newehdr.e_ident[EI_DATA] = ehdr.e_ident[EI_DATA];
@@ -629,7 +595,7 @@ process_file (const char *fname)
if (gelf_update_ehdr (elfnew, &newehdr) == 0)
{
error (0, 0, "Couldn't update ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Copy over the phdrs as is. */
@@ -638,7 +604,7 @@ process_file (const char *fname)
if (gelf_newphdr (elfnew, phnum) == 0)
{
error (0, 0, "Couldn't create phdrs: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
for (size_t cnt = 0; cnt < phnum; ++cnt)
@@ -648,13 +614,13 @@ process_file (const char *fname)
if (phdr == NULL)
{
error (0, 0, "Couldn't get phdr %zd: %s", cnt, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
if (gelf_update_phdr (elfnew, cnt, phdr) == 0)
{
error (0, 0, "Couldn't create phdr %zd: %s", cnt,
elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
}
}
@@ -698,7 +664,7 @@ process_file (const char *fname)
if (shdr == NULL)
{
error (0, 0, "Couldn't get shdr for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
uint64_t size = shdr->sh_size;
@@ -706,7 +672,7 @@ process_file (const char *fname)
if (sname == NULL)
{
error (0, 0, "Couldn't get name for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
/* strdup sname, the shdrstrndx section itself might be
@@ -728,7 +694,7 @@ process_file (const char *fname)
{
if (compress_section (scn, size, sname, NULL, ndx,
false, false, verbose > 0) < 0)
return cleanup (-1);
goto cleanup;
}
else if (strncmp (sname, ".zdebug", strlen (".zdebug")) == 0)
{
@@ -737,7 +703,7 @@ process_file (const char *fname)
newname = snamebuf;
if (compress_section (scn, size, sname, newname, ndx,
true, false, verbose > 0) < 0)
return cleanup (-1);
goto cleanup;
}
else if (verbose > 0)
printf ("[%zd] %s already decompressed\n", ndx, sname);
@@ -752,7 +718,7 @@ process_file (const char *fname)
Don't report even when verbose. */
if (compress_section (scn, size, sname, NULL, ndx,
false, false, false) < 0)
return cleanup (-1);
goto cleanup;
}
snamebuf[0] = '.';
@@ -779,13 +745,13 @@ process_file (const char *fname)
}
else
{
int res = compress_section (scn, size, sname, newname,
ndx, true, true,
verbose > 0);
if (res < 0)
return cleanup (-1);
int result = compress_section (scn, size, sname, newname,
ndx, true, true,
verbose > 0);
if (result < 0)
goto cleanup;
if (res == 0)
if (result == 0)
newname = NULL;
}
}
@@ -809,7 +775,7 @@ process_file (const char *fname)
Don't report even when verbose. */
if (compress_section (scn, size, sname, NULL, ndx,
true, false, false) < 0)
return cleanup (-1);
goto cleanup;
snamebuf[0] = '.';
strcpy (&snamebuf[1], &sname[2]);
@@ -837,7 +803,7 @@ process_file (const char *fname)
}
else if (compress_section (scn, size, sname, newname, ndx,
false, true, verbose > 0) < 0)
return cleanup (-1);
goto cleanup;
}
else if (verbose > 0)
printf ("[%zd] %s already compressed\n", ndx, sname);
@@ -851,7 +817,7 @@ process_file (const char *fname)
if (newscn == NULL)
{
error (0, 0, "Couldn't create new section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
GElf_Shdr shdr_mem;
@@ -859,13 +825,13 @@ process_file (const char *fname)
if (shdr == NULL)
{
error (0, 0, "Couldn't get shdr for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
if (gelf_update_shdr (newscn, shdr) == 0)
{
error (0, 0, "Couldn't update section header %zd", ndx);
return cleanup (-1);
goto cleanup;
}
/* Except for the section header string table all data can be
@@ -878,14 +844,14 @@ process_file (const char *fname)
if (data == NULL)
{
error (0, 0, "Couldn't get data from section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
Elf_Data *newdata = elf_newdata (newscn);
if (newdata == NULL)
{
error (0, 0, "Couldn't create new data for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
*newdata = *data;
@@ -903,7 +869,7 @@ process_file (const char *fname)
if (name == NULL)
{
error (0, 0, "Couldn't get name for section [%zd]", ndx);
return cleanup (-1);
goto cleanup;
}
}
@@ -912,7 +878,7 @@ process_file (const char *fname)
if ((scnstrents[ndx] = dwelf_strtab_add (names, name)) == NULL)
{
error (0, 0, "No memory to add section name string table");
return cleanup (-1);
goto cleanup;
}
/* If the symtab shares strings then add those too. */
@@ -929,7 +895,7 @@ process_file (const char *fname)
/* Don't report the (internal) uncompression. */
if (compress_section (newscn, size, sname, NULL, ndx,
false, false, false) < 0)
return cleanup (-1);
goto cleanup;
symtab_size = size;
symtab_compressed = T_COMPRESS_ZLIB;
@@ -939,7 +905,7 @@ process_file (const char *fname)
/* Don't report the (internal) uncompression. */
if (compress_section (newscn, size, sname, NULL, ndx,
true, false, false) < 0)
return cleanup (-1);
goto cleanup;
symtab_size = size;
symtab_compressed = T_COMPRESS_GNU;
@@ -951,7 +917,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get symtab data for section [%zd] %s",
ndx, name);
return cleanup (-1);
goto cleanup;
}
size_t elsize = gelf_fsize (elfnew, ELF_T_SYM, 1, EV_CURRENT);
size_t syms = symd->d_size / elsize;
@@ -963,7 +929,7 @@ process_file (const char *fname)
if (sym == NULL)
{
error (0, 0, "Couldn't get symbol %zd", i);
return cleanup (-1);
goto cleanup;
}
if (sym->st_name != 0)
{
@@ -975,13 +941,13 @@ process_file (const char *fname)
if (symname == NULL)
{
error (0, 0, "Couldn't get symbol %zd name", i);
return cleanup (-1);
goto cleanup;
}
symstrents[i] = dwelf_strtab_add (names, symname);
if (symstrents[i] == NULL)
{
error (0, 0, "No memory to add to symbol name");
return cleanup (-1);
goto cleanup;
}
}
}
@@ -1000,19 +966,19 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get new section header string table [%zd]",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
Elf_Data *data = elf_newdata (scn);
if (data == NULL)
{
error (0, 0, "Couldn't create new section header string table data");
return cleanup (-1);
goto cleanup;
}
if (dwelf_strtab_finalize (names, data) == NULL)
{
error (0, 0, "Not enough memory to create string table");
return cleanup (-1);
goto cleanup;
}
namesbuf = data->d_buf;
@@ -1022,7 +988,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get shdr for new section strings %zd",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
/* Note that we also might have to compress and possibly set
@@ -1042,7 +1008,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't update new section strings [%zd]",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
/* We might have to compress the data if the user asked us to,
@@ -1058,7 +1024,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get section header string table [%zd]",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
shdr = gelf_getshdr (oldscn, &shdr_mem);
@@ -1066,7 +1032,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get shdr for old section strings [%zd]",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
shstrtab_name = elf_strptr (elf, shdrstrndx, shdr->sh_name);
@@ -1074,7 +1040,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get name for old section strings [%zd]",
shdrstrndx);
return cleanup (-1);
goto cleanup;
}
shstrtab_size = shdr->sh_size;
@@ -1091,7 +1057,7 @@ process_file (const char *fname)
shstrtab_newname, shdrstrndx,
shstrtab_compressed == T_COMPRESS_GNU,
true, verbose > 0) < 0)
return cleanup (-1);
goto cleanup;
}
}
@@ -1100,7 +1066,7 @@ process_file (const char *fname)
if (gelf_getehdr (elfnew, &newehdr) == NULL)
{
error (0, 0, "Couldn't re-get new ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Set this after the sections have been created, otherwise section
@@ -1108,7 +1074,7 @@ process_file (const char *fname)
if (setshdrstrndx (elfnew, &newehdr, shdrstrndx) != 0)
{
error (0, 0, "Couldn't set new shdrstrndx: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Fixup pass. Adjust string table references, symbol table and
@@ -1125,7 +1091,7 @@ process_file (const char *fname)
if (shdr == NULL)
{
error (0, 0, "Couldn't get shdr for section %zd", ndx);
return cleanup (-1);
goto cleanup;
}
/* Keep the offset of allocated sections so they are at the
@@ -1147,7 +1113,7 @@ process_file (const char *fname)
if (gelf_update_shdr (scn, shdr) == 0)
{
error (0, 0, "Couldn't update section header %zd", ndx);
return cleanup (-1);
goto cleanup;
}
if (adjust_names && ndx == symtabndx)
@@ -1160,7 +1126,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get new symtab data section [%zd]",
ndx);
return cleanup (-1);
goto cleanup;
}
size_t elsize = gelf_fsize (elfnew, ELF_T_SYM, 1, EV_CURRENT);
size_t syms = symd->d_size / elsize;
@@ -1171,7 +1137,7 @@ process_file (const char *fname)
if (sym == NULL)
{
error (0, 0, "2 Couldn't get symbol %zd", i);
return cleanup (-1);
goto cleanup;
}
if (sym->st_name != 0)
@@ -1181,7 +1147,7 @@ process_file (const char *fname)
if (gelf_update_sym (symd, i, sym) == 0)
{
error (0, 0, "Couldn't update symbol %zd", i);
return cleanup (-1);
goto cleanup;
}
}
}
@@ -1199,7 +1165,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get symbol table [%zd]",
symtabndx);
return cleanup (-1);
goto cleanup;
}
shdr = gelf_getshdr (oldscn, &shdr_mem);
@@ -1207,7 +1173,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get old symbol table shdr [%zd]",
symtabndx);
return cleanup (-1);
goto cleanup;
}
symtab_name = elf_strptr (elf, shdrstrndx, shdr->sh_name);
@@ -1215,7 +1181,7 @@ process_file (const char *fname)
{
error (0, 0, "Couldn't get old symbol table name [%zd]",
symtabndx);
return cleanup (-1);
goto cleanup;
}
symtab_size = shdr->sh_size;
@@ -1233,7 +1199,7 @@ process_file (const char *fname)
symtab_newname, symtabndx,
symtab_compressed == T_COMPRESS_GNU,
true, verbose > 0) < 0)
return cleanup (-1);
goto cleanup;
}
}
}
@@ -1247,7 +1213,7 @@ process_file (const char *fname)
if (gelf_getehdr (elfnew, &newehdr) == NULL)
{
error (0, 0, "Couldn't get ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
/* Position the shdrs after the last (unallocated) section. */
@@ -1262,7 +1228,7 @@ process_file (const char *fname)
if (gelf_update_ehdr (elfnew, &newehdr) == 0)
{
error (0, 0, "Couldn't update ehdr: %s", elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
}
@@ -1272,7 +1238,7 @@ process_file (const char *fname)
if (elf_update (elfnew, ELF_C_WRITE) < 0)
{
error (0, 0, "Couldn't write %s: %s", fnew, elf_errmsg (-1));
return cleanup (-1);
goto cleanup;
}
elf_end (elfnew);
@@ -1294,14 +1260,45 @@ process_file (const char *fname)
if (rename (fnew, fname) != 0)
{
error (0, errno, "Couldn't rename %s to %s", fnew, fname);
return cleanup (-1);
goto cleanup;
}
/* We are finally done with the new file, don't unlink it now. */
free (fnew);
fnew = NULL;
res = 0;
return cleanup (0);
cleanup:
elf_end (elf);
close (fd);
elf_end (elfnew);
close (fdnew);
if (fnew != NULL)
{
unlink (fnew);
free (fnew);
fnew = NULL;
}
free (snamebuf);
if (names != NULL)
{
dwelf_strtab_free (names);
free (scnstrents);
free (symstrents);
free (namesbuf);
if (scnnames != NULL)
{
for (size_t n = 0; n < shnum; n++)
free (scnnames[n]);
free (scnnames);
}
}
free (sections);
return res;
}
int