GNU C Library master sources branch hjl/pr18078 created. glibc-2.21-181-g5dfc212

[hjl at sourceware dot org]

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        at  5dfc212622b0dbc03626def225bb805ba0c55760 (commit)

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=5dfc212622b0dbc03626def225bb805ba0c55760

commit 5dfc212622b0dbc03626def225bb805ba0c55760
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 9 13:22:01 2015 -0700

    Mark PLT entries for free and malloc options
    
    On x86, linker in binutils 2.26 and newer consolidates R_*_JUMP_SLOT with
    R_*_GLOB_DAT relocation against the same symbol.  It makes R_*_JUMP_SLOT
    relocations against free and malloc optional.  We should mark PLT entries
    for free and malloc optional.
    
    Check DT_RELA/DT_REL
    
    	[BZ #18078]
    	* sysdeps/unix/sysv/linux/i386/localplt.data: Mark PLT entries
    	for free and malloc optional.
    	* sysdeps/x86_64/localplt.data: New file.

diff --git a/scripts/check-localplt.awk b/scripts/check-localplt.awk
index bb1b912..01c5543 100644
--- a/scripts/check-localplt.awk
+++ b/scripts/check-localplt.awk
@@ -14,7 +14,10 @@ BEGIN { result = 0 }
 FILENAME != "-" && /^#/ { next }
 
 FILENAME != "-" {
-  if (NF != 2 && !(NF == 3 && $3 == "?")) {
+  if (NF == 5 && $3 == "+" && ($4 == "RELA" || $4 == "REL")) {
+    accept_alt[$1 " " $2] = $4;
+    accept_alt_reloc[$1 " " $2] = $5;
+  } else if (NF != 2 && !(NF == 3 && $3 == "?")) {
     printf "%s:%d: bad data line: %s\n", FILENAME, FNR, $0 > "/dev/stderr";
     result = 2;
   } else {
@@ -23,7 +26,7 @@ FILENAME != "-" {
   next;
 }
 
-NF != 2 {
+NF != 2 && !(NF == 4 && ($3 == "RELA" || $3 == "REL")) {
   print "Unexpected output from check-localplt:", $0 > "/dev/stderr";
   result = 2;
   next
@@ -31,7 +34,12 @@ NF != 2 {
 
 {
   key = $1 " " $2
-  if (key in accept) {
+  if ($3 == "RELA" || $3 == "REL") {
+    if (key in accept_alt && accept_alt[key] == $3 && accept_alt_reloc[key] == $4)
+      delete accept_alt[key]
+  } else if (NF == 2 && key in accept_alt) {
+    delete accept_alt[key]
+  } else if (key in accept) {
     delete accept[key]
   } else {
     print "Extra PLT reference:", $0;
@@ -49,5 +57,11 @@ END {
     }
   }
 
+  for (key in accept_alt) {
+    # It's mandatory.
+    print "Missing required " accept_alt_reloc[key] " reference:", key;
+    result = 1;
+  }
+
   exit(result);
 }
diff --git a/scripts/localplt.awk b/scripts/localplt.awk
index 84c94d1..f75b3b4 100644
--- a/scripts/localplt.awk
+++ b/scripts/localplt.awk
@@ -13,6 +13,8 @@ FILENAME != lastfile {
   }
   lastfile = FILENAME;
   jmprel_offset = 0;
+  rela_offset = 0;
+  rel_offset = 0;
   delete section_offset_by_address;
 }
 
@@ -43,6 +45,30 @@ in_relocs && relocs_offset == jmprel_offset && NF >= 5 {
   }
 }
 
+in_relocs && relocs_offset == rela_offset && NF >= 5 {
+  # Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
+  # value, but rather as the resolver symbol followed by ().
+  if ($4 ~ /\(\)/) {
+    print whatfile, gensub(/@.*/, "", "g", $5), "RELA", $3
+  } else {
+    symval = strtonum("0x" $4);
+    if (symval != 0)
+      print whatfile, gensub(/@.*/, "", "g", $5), "RELA", $3
+  }
+}
+
+in_relocs && relocs_offset == rel_offset && NF >= 5 {
+  # Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
+  # value, but rather as the resolver symbol followed by ().
+  if ($4 ~ /\(\)/) {
+    print whatfile, gensub(/@.*/, "", "g", $5), "REL", $3
+  } else {
+    symval = strtonum("0x" $4);
+    if (symval != 0)
+      print whatfile, gensub(/@.*/, "", "g", $5), "REL", $3
+  }
+}
+
 in_relocs { next }
 
 $1 == "Relocation" && $2 == "section" && $5 == "offset" {
@@ -62,4 +88,25 @@ $2 == "(JMPREL)" {
   next
 }
 
+$2 == "(RELA)" {
+  rela_addr = strtonum($3);
+  if (rela_addr in section_offset_by_address) {
+    rela_offset = section_offset_by_address[rela_addr];
+  } else {
+    print FILENAME ": *** DT_RELA does not match any section's address";
+    result = 2;
+  }
+  next
+}
+
+$2 == "(REL)" {
+  rel_addr = strtonum($3);
+  if (rel_addr in section_offset_by_address) {
+    rel_offset = section_offset_by_address[rel_addr];
+  } else {
+    print FILENAME ": *** DT_REL does not match any section's address";
+    result = 2;
+  }
+  next
+}
 END { exit(result) }
diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data
index b25abf8..2e03821 100644
--- a/sysdeps/unix/sysv/linux/i386/localplt.data
+++ b/sysdeps/unix/sysv/linux/i386/localplt.data
@@ -1,7 +1,9 @@
+# Linker in binutils 2.26 and newer consolidates R_X86_64_JUMP_SLOT
+# relocation with R_386_GLOB_DAT relocation against the same symbol.
 libc.so: _Unwind_Find_FDE
 libc.so: calloc
-libc.so: free
-libc.so: malloc
+libc.so: free + REL R_386_GLOB_DAT
+libc.so: malloc + REL R_386_GLOB_DAT
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
@@ -12,4 +14,4 @@ ld.so: __libc_memalign
 ld.so: malloc
 ld.so: calloc
 ld.so: realloc
-ld.so: free
+ld.so: free + REL R_386_GLOB_DAT
diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data
new file mode 100644
index 0000000..d140476
--- /dev/null
+++ b/sysdeps/x86_64/localplt.data
@@ -0,0 +1,19 @@
+# See scripts/check-localplt.awk for how this file is processed.
+# PLT use is required for the malloc family and for matherr because
+# users can define their own functions and have library internals call them.
+# Linker in binutils 2.26 and newer consolidates R_X86_64_JUMP_SLOT
+# relocation with R_X86_64_GLOB_DAT relocation against the same symbol.
+libc.so: calloc
+libc.so: free + RELA R_X86_64_GLOB_DAT
+libc.so: malloc + RELA R_X86_64_GLOB_DAT
+libc.so: memalign
+libc.so: realloc
+libm.so: matherr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free + RELA R_X86_64_GLOB_DAT

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