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dump/win_dump: limit number of processed PRCBs

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When number of CPUs utilized by guest Windows is less than defined in
QEMU (i.e., desktop versions of Windows severely limits number of CPU
sockets), patch_and_save_context routine accesses non-existent PRCB and
fails. So, limit number of processed PRCBs by NumberProcessors taken
from guest Windows driver.

Signed-off-by: Viktor Prutyanov <viktor.prutyanov@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20221019235948.656411-1-viktor.prutyanov@redhat.com>
This commit is contained in:
Viktor Prutyanov 2022-10-20 02:59:48 +03:00 committed by Marc-André Lureau
parent 113d8f4e95
commit e38c24cb58
1 changed files with 7 additions and 0 deletions
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7
dump/win_dump.c
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@ -273,6 +273,13 @@ static void patch_and_save_context(WinDumpHeader *h, bool x64,
uint64_t Context; uint64_t Context;
WinContext ctx; WinContext ctx;
if (i >= WIN_DUMP_FIELD(NumberProcessors)) {
warn_report("win-dump: number of QEMU CPUs is bigger than"
" NumberProcessors (%u) in guest Windows",
WIN_DUMP_FIELD(NumberProcessors));
return;
}
if (cpu_read_ptr(x64, first_cpu, if (cpu_read_ptr(x64, first_cpu,
KiProcessorBlock + i * win_dump_ptr_size(x64), KiProcessorBlock + i * win_dump_ptr_size(x64),
&Prcb)) { &Prcb)) {