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| author | Nick Clifton <nickc@redhat.com> | 2023-03-30 11:04:53 +0100 |
|---|---|---|
| committer | Nick Clifton <nickc@redhat.com> | 2023-03-30 11:04:53 +0100 |
| commit | 8d17c53b8dfc23b456e30c8f21d46dbcd55324ae (patch) | |
| tree | 6d8070ed4124b11e2d1b15103e35a798a5ae013e /binutils/dwarf.c | |
| parent | 3712e78cab09017bf59105d44e2f745c5e608c5a (diff) | |
| download | gdb-8d17c53b8dfc23b456e30c8f21d46dbcd55324ae.zip gdb-8d17c53b8dfc23b456e30c8f21d46dbcd55324ae.tar.gz gdb-8d17c53b8dfc23b456e30c8f21d46dbcd55324ae.tar.bz2 | |
Fix an illegal memory access triggered by parsing corrupt DWARF info.
PR 30284
* dwarf.c (read_and_display_attr_value): Detect and ignore negative base values.
Diffstat (limited to 'binutils/dwarf.c')
| -rw-r--r-- | binutils/dwarf.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/binutils/dwarf.c b/binutils/dwarf.c index 89b0b80..d6fc9fe 100644 --- a/binutils/dwarf.c +++ b/binutils/dwarf.c @@ -2802,7 +2802,7 @@ read_and_display_attr_value (unsigned long attribute, break; default: - warn (_("Unrecognized form: %#lx\n"), form); + warn (_("Unrecognized form: %#lx"), form); /* What to do? Consume a byte maybe? */ ++data; break; @@ -2820,22 +2820,48 @@ read_and_display_attr_value (unsigned long attribute, "(%#" PRIx64 " and %#" PRIx64 ")"), debug_info_p->cu_offset, debug_info_p->loclists_base, uvalue); + svalue = uvalue; + if (svalue < 0) + { + warn (_("CU @ %#" PRIx64 " has has a negative loclists_base " + "value of %#" PRIx64 " - treating as zero"), + debug_info_p->cu_offset, svalue); + uvalue = 0; + } debug_info_p->loclists_base = uvalue; break; + case DW_AT_rnglists_base: if (debug_info_p->rnglists_base) warn (_("CU @ %#" PRIx64 " has multiple rnglists_base values " "(%#" PRIx64 " and %#" PRIx64 ")"), debug_info_p->cu_offset, debug_info_p->rnglists_base, uvalue); + svalue = uvalue; + if (svalue < 0) + { + warn (_("CU @ %#" PRIx64 " has has a negative rnglists_base " + "value of %#" PRIx64 " - treating as zero"), + debug_info_p->cu_offset, svalue); + uvalue = 0; + } debug_info_p->rnglists_base = uvalue; break; + case DW_AT_str_offsets_base: if (debug_info_p->str_offsets_base) warn (_("CU @ %#" PRIx64 " has multiple str_offsets_base values " "%#" PRIx64 " and %#" PRIx64 ")"), debug_info_p->cu_offset, debug_info_p->str_offsets_base, uvalue); + svalue = uvalue; + if (svalue < 0) + { + warn (_("CU @ %#" PRIx64 " has has a negative stroffsets_base " + "value of %#" PRIx64 " - treating as zero"), + debug_info_p->cu_offset, svalue); + uvalue = 0; + } debug_info_p->str_offsets_base = uvalue; break; @@ -8245,7 +8271,7 @@ display_debug_ranges (struct dwarf_section *section, } introduce (section, false); - + if (is_rnglists) return display_debug_rnglists (section); @@ -8324,7 +8350,7 @@ display_debug_ranges (struct dwarf_section *section, } next = section_begin + offset + debug_info_p->rnglists_base; - + /* If multiple DWARF entities reference the same range then we will have multiple entries in the `range_entries' list for the same offset. Thanks to the sort above these will all be consecutive in |