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Revision 9c2f0338bbd132a4b12b988004d796798609d297 authored by Linus Torvalds on 02 February 2024, 20:54:46 UTC, committed by Linus Torvalds on 02 February 2024, 20:54:46 UTC 
Merge tag 'drm-fixes-2024-02-03' of git://anongit.freedesktop.org/drm/drm
 
Pul drm fixes from Dave Airlie:
 "Regular weekly fixes, mostly amdgpu and xe. One nouveau fix is a
  better fix for the deadlock and also helps with a sync race we were
  seeing.

  dma-buf:
   - heaps CMA page accounting fix

  virtio-gpu:
   - fix segment size

  xe:
   - A crash fix
   - A fix for an assert due to missing mem_acces ref
   - Only allow a single user-fence per exec / bind.
   - Some sparse warning fixes
   - Two fixes for compilation failures on various odd combinations of
     gcc / arch pointed out on LKML.
   - Fix a fragile partial allocation pointed out on LKML.
   - A sysfs ABI documentation warning fix

  amdgpu:
   - Fix reboot issue seen on some 7000 series dGPUs
   - Fix client init order for KFD
   - Misc display fixes
   - USB-C fix
   - DCN 3.5 fixes
   - Fix issues with GPU scheduler and GPU reset
   - GPU firmware loading fix
   - Misc fixes
   - GC 11.5 fix
   - VCN 4.0.5 fix
   - IH overflow fix

  amdkfd:
   - SVM fixes
   - Trap handler fix
   - Fix device permission lookup
   - Properly reserve BO before validating it

  nouveau:
   - fence/irq lock deadlock fix (second attempt)
   - gsp command size fix

* tag 'drm-fixes-2024-02-03' of git://anongit.freedesktop.org/drm/drm: (35 commits)
  nouveau: offload fence uevents work to workqueue
  nouveau/gsp: use correct size for registry rpc.
  drm/amdgpu/pm: Use inline function for IP version check
  drm/hwmon: Fix abi doc warnings
  drm/xe: Make all GuC ABI shift values unsigned
  drm/xe/vm: Subclass userptr vmas
  drm/xe: Use LRC prefix rather than CTX prefix in lrc desc defines
  drm/xe: Don't use __user error pointers
  drm/xe: Annotate mcr_[un]lock()
  drm/xe: Only allow 1 ufence per exec / bind IOCTL
  drm/xe: Grab mem_access when disabling C6 on skip_guc_pc platforms
  drm/xe: Fix crash in trace_dma_fence_init()
  drm/amdgpu: Reset IH OVERFLOW_CLEAR bit
  drm/amdgpu: remove asymmetrical irq disabling in vcn 4.0.5 suspend
  drm/amdgpu: drm/amdgpu: remove golden setting for gfx 11.5.0
  drm/amdkfd: reserve the BO before validating it
  drm/amdgpu: Fix missing error code in 'gmc_v6/7/8/9_0_hw_init()'
  drm/amd/display: Fix buffer overflow in 'get_host_router_total_dp_tunnel_bw()'
  drm/amd/display: Add NULL check for kzalloc in 'amdgpu_dm_atomic_commit_tail()'
  drm/amd: Don't init MEC2 firmware when it fails to load
  ...
2 parent s eab5c86 + 39126ab
Raw File
auth.c 
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */

#include <linux/sched.h>
#include "nfsd.h"
#include "auth.h"

int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
{
	struct exp_flavor_info *f;
	struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;

	for (f = exp->ex_flavors; f < end; f++) {
		if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
			return f->flags;
	}
	return exp->ex_flags;

}

int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
{
	struct group_info *rqgi;
	struct group_info *gi;
	struct cred *new;
	int i;
	int flags = nfsexp_flags(rqstp, exp);

	/* discard any old override before preparing the new set */
	revert_creds(get_cred(current_real_cred()));
	new = prepare_creds();
	if (!new)
		return -ENOMEM;

	new->fsuid = rqstp->rq_cred.cr_uid;
	new->fsgid = rqstp->rq_cred.cr_gid;

	rqgi = rqstp->rq_cred.cr_group_info;

	if (flags & NFSEXP_ALLSQUASH) {
		new->fsuid = exp->ex_anon_uid;
		new->fsgid = exp->ex_anon_gid;
		gi = groups_alloc(0);
		if (!gi)
			goto oom;
	} else if (flags & NFSEXP_ROOTSQUASH) {
		if (uid_eq(new->fsuid, GLOBAL_ROOT_UID))
			new->fsuid = exp->ex_anon_uid;
		if (gid_eq(new->fsgid, GLOBAL_ROOT_GID))
			new->fsgid = exp->ex_anon_gid;

		gi = groups_alloc(rqgi->ngroups);
		if (!gi)
			goto oom;

		for (i = 0; i < rqgi->ngroups; i++) {
			if (gid_eq(GLOBAL_ROOT_GID, rqgi->gid[i]))
				gi->gid[i] = exp->ex_anon_gid;
			else
				gi->gid[i] = rqgi->gid[i];
		}

		/* Each thread allocates its own gi, no race */
		groups_sort(gi);
	} else {
		gi = get_group_info(rqgi);
	}

	if (uid_eq(new->fsuid, INVALID_UID))
		new->fsuid = exp->ex_anon_uid;
	if (gid_eq(new->fsgid, INVALID_GID))
		new->fsgid = exp->ex_anon_gid;

	set_groups(new, gi);
	put_group_info(gi);

	if (!uid_eq(new->fsuid, GLOBAL_ROOT_UID))
		new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
	else
		new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
							new->cap_permitted);
	put_cred(override_creds(new));
	put_cred(new);
	return 0;

oom:
	abort_creds(new);
	return -ENOMEM;
}
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