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#include <unistd.h>
#include <sys/types.h>

#include "privs.h"
#include "die.h"

void drop_privileges(bool enforce, uid_t uid, gid_t gid)
{
	if (enforce) {
		if (uid == getuid())
			panic("Uid cannot be the same as the current user!\n");
		if (gid == getgid())
			panic("Gid cannot be the same as the current user!\n");
	}
	if (setgid(gid) != 0)
		panic("Unable to drop group privileges: %s!\n", strerror(errno));
	if (setuid(uid) != 0)
		panic("Unable to drop user privileges: %s!\n", strerror(errno));
}
elect>mode:
authorChristoph Hellwig <hch@lst.de>2017-02-05 18:10:35 +0100
committerJens Axboe <axboe@fb.com>2017-02-06 09:34:46 -0700
commiteeeefd41843218c55a8782a6920f044d9bf6207a (patch)
treec342eac46626e62745aa8e1a982626efca8b121d /net/dsa/dsa_priv.h
parentc14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
block: don't try Write Same from __blkdev_issue_zeroout
Write Same can return an error asynchronously if it turns out the underlying SCSI device does not support Write Same, which makes a proper fallback to other methods in __blkdev_issue_zeroout impossible. Thus only issue a Write Same from blkdev_issue_zeroout an don't try it at all from __blkdev_issue_zeroout as a non-invasive workaround. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout") Tested-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/dsa/dsa_priv.h')