Fix BZ #18084 -- backtrace (..., 0) dumps core on x86.

Other architectures also had bugs, or did unnecessary work.

diff --git a/ChangeLog b/ChangeLog
index 7859f737cdbb1110d978221e89fe7bdd35418550..a00482ddf2d41f52cd2e0efd7db9cac96b46e040 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2015-08-15  Paul Pluzhnikov  <ppluzhnikov@google.com>
+
+       [BZ #18084]
+       * debug/tst-backtrace2.c (do_test): Add test for BZ #18084.
+       * sysdeps/arm/backtrace.c (__backtrace): Handle size <= 0.
+       * sysdeps/i386/backtrace.c (__backtrace): Likewise.
+       * sysdeps/m68k/backtrace.c (__backtrace): Likewise.
+       * sysdeps/microblaze/backtrace.c (__backtrace): Likewise.
+       * sysdeps/s390/s390-32/backtrace.c (__backtrace): Likewise.
+       * sysdeps/s390/s390-64/backtrace.c (__backtrace): Likewise.
+       * sysdeps/sparc/backtrace.c (__backtrace): Likewise.
+       * sysdeps/x86_64/backtrace.c (__backtrace): Likewise.
+
 2015-08-15  Zack Weinberg  <zackw@panix.com>
 
        [BZ #18795]

diff --git a/NEWS b/NEWS
index 3ee303583b3fa8453116438fb7775ae2fbff725b..12b258a5174ff342a17b5df97b87c53067a4c3be 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -9,9 +9,10 @@ Version 2.23
 
 * The following bugs are resolved with this release:
 
-  16517, 16519, 16520, 16734, 17905, 18086, 18265, 18480, 18525, 18618,
-  18647, 18661, 18674, 18778, 18781, 18787, 18789, 18790, 18795, 18820,
-  18824.
+  16517, 16519, 16520, 16734, 17905, 18084, 18086, 18265, 18480, 18525,
+  18618, 18647, 18661, 18674, 18778, 18781, 18787, 18789, 18790, 18795,
+  18820, 18824.
+
 \f
 Version 2.22
 

diff --git a/debug/tst-backtrace2.c b/debug/tst-backtrace2.c
index 846ca35555999f3c48c390fa892c9fdc8794463d..396d743a53424910f3f7a34c902331962a5b7075 100644 (file)
--- a/debug/tst-backtrace2.c
+++ b/debug/tst-backtrace2.c
@@ -94,6 +94,12 @@ fn3 (void)
 NO_INLINE static int
 do_test (void)
 {
+  /* Test BZ #18084.  */
+  void *buffer[1];
+
+  if (backtrace (buffer, 0) != 0)
+    FAIL ();
+
   fn3 ();
   return ret;
 }

diff --git a/sysdeps/arm/backtrace.c b/sysdeps/arm/backtrace.c
index 7ab487c2fc0598325d53f73fbefbc8c04f4cdb6e..5a30c209ffe765ac53444e7943cf0bd187ee6220 100644 (file)
--- a/sysdeps/arm/backtrace.c
+++ b/sysdeps/arm/backtrace.c
@@ -92,6 +92,10 @@ __backtrace (array, size)
      int size;
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -100,8 +104,7 @@ __backtrace (array, size)
     return 0;
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
     --arg.cnt;

diff --git a/sysdeps/i386/backtrace.c b/sysdeps/i386/backtrace.c
index 550234f577988d00013a4270913c63ae848c7944..f10ed566dc20acab6931449e521d0235d6a84404 100644 (file)
--- a/sysdeps/i386/backtrace.c
+++ b/sysdeps/i386/backtrace.c
@@ -114,6 +114,10 @@ __backtrace (array, size)
      int size;
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -122,8 +126,7 @@ __backtrace (array, size)
     return 0;
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
     --arg.cnt;

diff --git a/sysdeps/m68k/backtrace.c b/sysdeps/m68k/backtrace.c
index 311425192550c0f86fea6e73639d201a7a12bc54..ca7d25929efee98e507ca2d6b54052d2a361e8d2 100644 (file)
--- a/sysdeps/m68k/backtrace.c
+++ b/sysdeps/m68k/backtrace.c
@@ -111,6 +111,10 @@ int
 __backtrace (void **array, int size)
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -119,8 +123,7 @@ __backtrace (void **array, int size)
     return 0;
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
     --arg.cnt;

diff --git a/sysdeps/microblaze/backtrace.c b/sysdeps/microblaze/backtrace.c
index 24e827ac39805f3c41fbf7f33e18afce70c1aeb4..c043ba7681db579d9cde31437b16e1d94762d469 100644 (file)
--- a/sysdeps/microblaze/backtrace.c
+++ b/sysdeps/microblaze/backtrace.c
@@ -114,6 +114,9 @@ __backtrace (void **array, int size)
   int count;
   int rc = 0;
 
+  if (size <= 0)
+    return 0;
+
   __asm__ __volatile__ ("mfs %0, rpc"
                         : "=r"(pc));
 

diff --git a/sysdeps/s390/s390-32/backtrace.c b/sysdeps/s390/s390-32/backtrace.c
index 73db65275daa3e0067da692831d3ed52fceaf02a..4e5e1feee699f48a00fefe41f4aa7b575299cc25 100644 (file)
--- a/sysdeps/s390/s390-32/backtrace.c
+++ b/sysdeps/s390/s390-32/backtrace.c
@@ -126,6 +126,10 @@ int
 __backtrace (void **array, int size)
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -135,8 +139,7 @@ __backtrace (void **array, int size)
     return __backchain_backtrace (array, size);
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   return arg.cnt != -1 ? arg.cnt : 0;
 }

diff --git a/sysdeps/s390/s390-64/backtrace.c b/sysdeps/s390/s390-64/backtrace.c
index 08e563e0df15839a5edd8dc7642f30de75d78c12..184a73741b08219c131d1747a9239ba3a8bdfd3c 100644 (file)
--- a/sysdeps/s390/s390-64/backtrace.c
+++ b/sysdeps/s390/s390-64/backtrace.c
@@ -125,6 +125,10 @@ int
 __backtrace (void **array, int size)
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -134,8 +138,7 @@ __backtrace (void **array, int size)
     return __backchain_backtrace (array, size);
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   return arg.cnt != -1 ? arg.cnt : 0;
 }

diff --git a/sysdeps/sparc/backtrace.c b/sysdeps/sparc/backtrace.c
index 754f45bfebbf65254a7c04a1c18c2e2fd0269606..cb01fd6a07d017a73fb1d9b1a1d6ccc40d3a9e94 100644 (file)
--- a/sysdeps/sparc/backtrace.c
+++ b/sysdeps/sparc/backtrace.c
@@ -108,7 +108,7 @@ __backtrace (void **array, int size)
   bool use_unwinder;
   int count;
 
-  if (!size)
+  if (size <= 0)
     return 0;
 
   use_unwinder = true;

diff --git a/sysdeps/x86_64/backtrace.c b/sysdeps/x86_64/backtrace.c
index 2a3848d20f531ee0565af82d62eaecf4ad7c6f86..21448c8f1cfda3fae564b3f2967e36e76fc6938e 100644 (file)
--- a/sysdeps/x86_64/backtrace.c
+++ b/sysdeps/x86_64/backtrace.c
@@ -97,6 +97,10 @@ __backtrace (array, size)
      int size;
 {
   struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -105,8 +109,7 @@ __backtrace (array, size)
     return 0;
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   /* _Unwind_Backtrace seems to put NULL address above
      _start.  Fix it up here.  */