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dumpon: proceed without compression if the kernel lacks support

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PR:		252554
Reviewed by:	markj
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34520
This commit is contained in:
Ed Maste 2022-03-10 13:04:34 -05:00
parent 19837718ab
commit 2b20327ec9
1 changed files with 9 additions and 0 deletions
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9
sbin/dumpon/dumpon.c
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@ -650,6 +650,15 @@ main(int argc, char *argv[])
error = ioctl(fd, DIOCSKERNELDUMP, kdap);
if (error != 0)
error = errno;
if (error == EINVAL && (gzip || zstd)) {
/* Retry without compression in case kernel lacks support. */
kdap->kda_compression = KERNELDUMP_COMP_NONE;
error = ioctl(fd, DIOCSKERNELDUMP, kdap);
if (error == 0)
warnx("Compression disabled; kernel may lack gzip or zstd support.");
else
error = errno;
}
explicit_bzero(kdap->kda_encryptedkey, kdap->kda_encryptedkeysize);
free(kdap->kda_encryptedkey);
explicit_bzero(kdap, sizeof(*kdap));