94 lines
3.9 KiB
Diff
94 lines
3.9 KiB
Diff
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commit 3bce9544deab0261c7c55ccdc46ce1f36e468040
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Author: Mark Wielaard <mark@klomp.org>
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Date: Thu Jul 12 13:56:00 2018 +0200
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Accept read-only PT_LOAD segments and .rodata.
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The new binutils ld -z separate-code option creates multiple read-only
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PT_LOAD segments and might place .rodata in a non-executable segment.
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Allow and keep track of separate read-only segments and allow a readonly
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page with .rodata section.
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Based on patches from Tom Hughes <tom@compton.nu> and
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H.J. Lu <hjl.tools@gmail.com>.
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https://bugs.kde.org/show_bug.cgi?id=395682
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index 13991b6..c36d498 100644
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--- a/coregrind/m_debuginfo/debuginfo.c
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+++ b/coregrind/m_debuginfo/debuginfo.c
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@@ -1126,9 +1126,7 @@ ULong VG_(di_notify_mmap)( Addr a, Bool allow_SkFileV, Int use_fd )
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# error "Unknown platform"
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# endif
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-# if defined(VGP_x86_darwin) && DARWIN_VERS >= DARWIN_10_7
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is_ro_map = seg->hasR && !seg->hasW && !seg->hasX;
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-# endif
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# if defined(VGO_solaris)
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is_rx_map = seg->hasR && seg->hasX && !seg->hasW;
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diff --git a/coregrind/m_debuginfo/readelf.c b/coregrind/m_debuginfo/readelf.c
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index 62192f0..95b97d6 100644
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--- a/coregrind/m_debuginfo/readelf.c
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+++ b/coregrind/m_debuginfo/readelf.c
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@@ -1881,7 +1881,7 @@ Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di )
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Bool loaded = False;
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for (j = 0; j < VG_(sizeXA)(di->fsm.maps); j++) {
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const DebugInfoMapping* map = VG_(indexXA)(di->fsm.maps, j);
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- if ( (map->rx || map->rw)
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+ if ( (map->rx || map->rw || map->ro)
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&& map->size > 0 /* stay sane */
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&& a_phdr.p_offset >= map->foff
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&& a_phdr.p_offset < map->foff + map->size
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@@ -1912,6 +1912,16 @@ Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di )
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i, (UWord)item.bias);
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loaded = True;
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}
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+ if (map->ro
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+ && (a_phdr.p_flags & (PF_R | PF_W | PF_X))
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+ == PF_R) {
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+ item.exec = False;
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+ VG_(addToXA)(svma_ranges, &item);
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+ TRACE_SYMTAB(
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+ "PT_LOAD[%ld]: acquired as ro, bias 0x%lx\n",
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+ i, (UWord)item.bias);
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+ loaded = True;
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+ }
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}
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}
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if (!loaded) {
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@@ -2179,17 +2189,25 @@ Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di )
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}
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}
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- /* Accept .rodata where mapped as rx (data), even if zero-sized */
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+ /* Accept .rodata where mapped as rx or rw (data), even if zero-sized */
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if (0 == VG_(strcmp)(name, ".rodata")) {
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- if (inrx && !di->rodata_present) {
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- di->rodata_present = True;
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+ if (!di->rodata_present) {
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di->rodata_svma = svma;
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- di->rodata_avma = svma + inrx->bias;
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+ di->rodata_avma = svma;
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di->rodata_size = size;
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- di->rodata_bias = inrx->bias;
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di->rodata_debug_svma = svma;
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- di->rodata_debug_bias = inrx->bias;
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- /* NB was 'inrw' prior to r11794 */
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+ if (inrx) {
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+ di->rodata_avma += inrx->bias;
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+ di->rodata_bias = inrx->bias;
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+ di->rodata_debug_bias = inrx->bias;
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+ } else if (inrw) {
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+ di->rodata_avma += inrw->bias;
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+ di->rodata_bias = inrw->bias;
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+ di->rodata_debug_bias = inrw->bias;
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+ } else {
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+ BAD(".rodata");
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+ }
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+ di->rodata_present = True;
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TRACE_SYMTAB("acquiring .rodata svma = %#lx .. %#lx\n",
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di->rodata_svma,
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di->rodata_svma + di->rodata_size - 1);
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