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Fix minidump on ChromeOS

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Chrome somehow changed the memory mapping with hugepage enabled.
This makes the hack in CrOSPostProcessMappings more general.

BUG=chromium:793452
TEST=with this patch on Chromium,
         minidump_dump *dmp shows the right information on chrome

Change-Id: Iff58bf1a712a6e66cbd2d813422db7549a3080a5
Reviewed-on: https://chromium-review.googlesource.com/837963
Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Yunlian Jiang 2017-12-20 12:16:34 -08:00 committed by Mark Mentovai
parent c283630201
commit 4af3e83b10
1 changed files with 25 additions and 8 deletions
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33
src/client/linux/minidump_writer/linux_dumper.cc
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@ -230,20 +230,21 @@ void CrOSPostProcessMappings(wasteful_vector<MappingInfo*>& mappings) {
l = m + 1; l = m + 1;
} }
// Try to merge segments into the first. // Shows the range that contains the entry point is
if (next < mappings.size()) { // [first_start_addr, first_end_addr)
TryRecoverMappings(mappings[0], mappings[next]); size_t first_start_addr = mappings[0]->start_addr;
if (next - 1 > 0) size_t first_end_addr = mappings[0]->start_addr + mappings[0]->size;
TryRecoverMappings(mappings[next - 1], mappings[0], mappings[next]);
} // Put the out-of-order segment in order.
std::rotate(mappings.begin(), mappings.begin() + 1, mappings.begin() + next);
// Iterate through normal, sorted cases. // Iterate through normal, sorted cases.
// Normal case 1. // Normal case 1.
for (size_t i = 1; i < mappings.size() - 1; i++) for (size_t i = 0; i < mappings.size() - 1; i++)
TryRecoverMappings(mappings[i], mappings[i + 1]); TryRecoverMappings(mappings[i], mappings[i + 1]);
// Normal case 2. // Normal case 2.
for (size_t i = 1; i < mappings.size() - 2; i++) for (size_t i = 0; i < mappings.size() - 2; i++)
TryRecoverMappings(mappings[i], mappings[i + 1], mappings[i + 2]); TryRecoverMappings(mappings[i], mappings[i + 1], mappings[i + 2]);
// Collect merged (size == 0) segments. // Collect merged (size == 0) segments.
@ -252,6 +253,22 @@ void CrOSPostProcessMappings(wasteful_vector<MappingInfo*>& mappings) {
if (mappings[e]->size > 0) if (mappings[e]->size > 0)
mappings[f++] = mappings[e]; mappings[f++] = mappings[e];
mappings.resize(f); mappings.resize(f);
// The entry point is in the first mapping. We want to find the location
// of the entry point after merging segment. To do this, we want to find
// the mapping that covers the first mapping from the original mapping list.
// If the mapping is not in the beginning, we move it to the begining via
// a right rotate by using reverse iterators.
for (l = 0; l < mappings.size(); l++) {
if (mappings[l]->start_addr <= first_start_addr
&& (mappings[l]->start_addr + mappings[l]->size >= first_end_addr))
break;
}
if (l > 0) {
r = mappings.size();
std::rotate(mappings.rbegin() + r - l - 1, mappings.rbegin() + r - l,
mappings.rend());
}
} }
#endif // __CHROMEOS__ #endif // __CHROMEOS__