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linux-user/elfload: check PR_GET_DUMPABLE before creating coredump

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A process can opt-out of coredump creation by calling
prctl(PR_SET_DUMPABLE, 0).
linux-user passes this call from the guest through to the
operating system.
From there it can be read back again to avoid creating coredumps from
qemu-user itself if the guest chose so.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
Message-Id: <20240120-qemu-user-dumpable-v3-2-6aa410c933f1@t-8ch.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Thomas Weißschuh 2024-01-20 22:45:25 +01:00 committed by Richard Henderson
parent 3805d4287f
commit 0ea731db5a
1 changed files with 6 additions and 0 deletions
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6
linux-user/elfload.c
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@ -2,6 +2,7 @@
#include "qemu/osdep.h"
#include <sys/param.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/shm.h>
@ -4667,6 +4668,11 @@ static int elf_core_dump(int signr, const CPUArchState *env)
init_note_info(&info);
errno = 0;
if (prctl(PR_GET_DUMPABLE) == 0) {
return 0;
}
if (getrlimit(RLIMIT_CORE, &dumpsize) == 0 && dumpsize.rlim_cur == 0) {
return 0;
}