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authorSandra Loosemore <sandra@codesourcery.com>2016-10-26 12:12:01 -0500
committerPedro Alves <palves@redhat.com>2016-10-26 16:47:46 +0100
commitecf45d2cc7667ed4692d07e52fc77a2c9a8adf1c (patch)
treeabc757e04ab221b35d3d0db5afba7f9f82da645a /gdb/main.c
parentb15cc25cbe7c13e450f77b4a309223b9b3da3936 (diff)
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PR 20569, segv in follow_exec
The following testcases make GDB crash whenever an invalid sysroot is provided, when GDB is unable to find a valid path to the symbol file: gdb.base/catch-syscall.exp gdb.base/execl-update-breakpoints.exp gdb.base/foll-exec-mode.exp gdb.base/foll-exec.exp gdb.base/foll-vfork.exp gdb.base/pie-execl.exp gdb.multi/bkpt-multi-exec.exp gdb.python/py-finish-breakpoint.exp gdb.threads/execl.exp gdb.threads/non-ldr-exc-1.exp gdb.threads/non-ldr-exc-2.exp gdb.threads/non-ldr-exc-3.exp gdb.threads/non-ldr-exc-4.exp gdb.threads/thread-execl.exp The immediate cause of the segv is that follow_exec is passing a NULL argument (the result of exec_file_find) to strlen. However, the problem is deeper than that: follow_exec simply isn't prepared for the case where sysroot translation fails to locate the new executable. Actually all callers of exec_file_find have bugs due to confusion between host and target pathnames. This commit attempts to fix all that. In terms of the testcases that were formerly segv'ing, GDB now prints a warning but continues execution of the new program, so that the tests now mostly FAIL instead. You could argue the FAILs are due to a legitimate problem with the test environment setting up the sysroot translation incorrectly. A new representative test is added which exercises the ne wwarning code path even with native testing. Tested on x86_64 Fedora 23, native and gdbserver. gdb/ChangeLog: 2016-10-25 Sandra Loosemore <sandra@codesourcery.com> Luis Machado <lgustavo@codesourcery.com> Pedro Alves <palves@redhat.com> PR gdb/20569 * exceptions.c (exception_print_same): Moved here from exec.c. * exceptions.h (exception_print_same): Declare. * exec.h: Include "symfile-add-flags.h". (try_open_exec_file): New declaration. * exec.c (exception_print_same): Moved to exceptions.c. (try_open_exec_file): New function. (exec_file_locate_attach): Rename exec_file and full_exec_path variables to avoid confusion between target and host pathnames. Move pathname processing logic to exec_file_find. Do not return early if pathname lookup fails; Call try_open_exec_file. * infrun.c (follow_exec): Split and rename execd_pathname variable to avoid confusion between target and host pathnames. Warn if pathname lookup fails. Pass target pathname to target_follow_exec, not hostpathname. Call try_open_exec_file. * main.c (symbol_file_add_main_adapter): New function. (captured_main_1): Use it. * solib-svr4.c (open_symbol_file_object): Adjust to pass symfile_add_flags to symbol_file_add_main. * solib.c (exec_file_find): Incorporate fallback logic for relative pathnames formerly in exec_file_locate_attach. * symfile.c (symbol_file_add_main, symbol_file_add_main_1): Replace 'from_tty' parameter with a symfile_add_file. (symbol_file_command): Adjust to pass symfile_add_flags to symbol_file_add_main. * symfile.h (symbol_file_add_main): Replace 'from_tty' parameter with a symfile_add_file. gdb/testsuite/ChangeLog: 2016-10-25 Luis Machado <lgustavo@codesourcery.com> * gdb.base/exec-invalid-sysroot.exp: New file.
Diffstat (limited to 'gdb/main.c')
-rw-r--r--gdb/main.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/gdb/main.c b/gdb/main.c
index 23852e2..ca6a81e 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -413,6 +413,20 @@ catch_command_errors_const (catch_command_errors_const_ftype *command,
return 1;
}
+/* Adapter for symbol_file_add_main that translates 'from_tty' to a
+ symfile_add_flags. */
+
+static void
+symbol_file_add_main_adapter (const char *arg, int from_tty)
+{
+ symfile_add_flags add_flags = 0;
+
+ if (from_tty)
+ add_flags |= SYMFILE_VERBOSE;
+
+ symbol_file_add_main (arg, add_flags);
+}
+
/* Type of this option. */
enum cmdarg_kind
{
@@ -1029,7 +1043,7 @@ captured_main_1 (struct captured_main_args *context)
catch_command_errors returns non-zero on success! */
if (catch_command_errors_const (exec_file_attach, execarg,
!batch_flag))
- catch_command_errors_const (symbol_file_add_main, symarg,
+ catch_command_errors_const (symbol_file_add_main_adapter, symarg,
!batch_flag);
}
else
@@ -1038,7 +1052,7 @@ captured_main_1 (struct captured_main_args *context)
catch_command_errors_const (exec_file_attach, execarg,
!batch_flag);
if (symarg != NULL)
- catch_command_errors_const (symbol_file_add_main, symarg,
+ catch_command_errors_const (symbol_file_add_main_adapter, symarg,
!batch_flag);
}