From 6b1cecf3a4e6308679167f5c2835d7df92423972 Mon Sep 17 00:00:00 2001 From: Dave Korn Date: Wed, 18 Feb 2009 18:38:06 +0000 Subject: [PATCH] PR gas/7059 * coffcode.h (coff_write_object_contents): Don't let the string table offset overflow the s_name field when using long section names. --- bfd/ChangeLog | 6 ++++++ bfd/coffcode.h | 25 +++++++++++++++++++++++-- 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index fad6a189f9..55f1c73e5b 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,9 @@ +2009-18-02 Dave Korn + + PR gas/7059 + * coffcode.h (coff_write_object_contents): Don't let the string + table offset overflow the s_name field when using long section names. + 2009-18-02 Dave Korn * coff-alpha.c (alpha_ecoff_backend_data): Initialise fields which diff --git a/bfd/coffcode.h b/bfd/coffcode.h index cfa1a40567..59bb223521 100644 --- a/bfd/coffcode.h +++ b/bfd/coffcode.h @@ -3629,8 +3629,29 @@ coff_write_object_contents (bfd * abfd) len = strlen (current->name); if (len > SCNNMLEN) { - memset (section.s_name, 0, SCNNMLEN); - sprintf (section.s_name, "/%lu", (unsigned long) string_size); + /* The s_name field is defined to be NUL-padded but need not be + NUL-terminated. We use a temporary buffer so that we can still + sprintf all eight chars without splatting a terminating NUL + over the first byte of the following member (s_paddr). */ + char s_name_buf[SCNNMLEN + 1]; + + /* An inherent limitation of the /nnnnnnn notation used to indicate + the offset of the long name in the string table is that we + cannot address entries beyone the ten million byte boundary. */ + if (string_size >= 10000000) + { + bfd_set_error (bfd_error_file_too_big); + (*_bfd_error_handler) + (_("%B: section %s: string table overflow at offset %ld"), + abfd, current->name, string_size); + return FALSE; + } + + /* snprintf not strictly necessary now we've verified the value + has less than eight ASCII digits, but never mind. */ + snprintf (s_name_buf, SCNNMLEN + 1, "/%lu", (unsigned long) string_size); + /* Then strncpy takes care of any padding for us. */ + strncpy (section.s_name, s_name_buf, SCNNMLEN); string_size += len + 1; long_section_names = TRUE; } -- 2.34.1