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apparmor: make sure perm indexes are accumulated

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accumulate permission indexes on a first encountered basis. This
favors original rulesets so that new ones can not override without
profile replacement.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2022-09-05 23:53:29 -07:00
parent 670f31774a
commit 0bece4fa97
3 changed files with 25 additions and 2 deletions
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4
security/apparmor/include/file.h
View File

@ -88,10 +88,10 @@ static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx)
* - exec type - which determines how the executable name and index are used
* - flags - which modify how the destination name is applied
*/
#define AA_X_INDEX_MASK 0x00ffffff
#define AA_X_INDEX_MASK AA_INDEX_MASK
#define AA_X_TYPE_MASK 0x0c000000
#define AA_X_NONE 0x00000000
#define AA_X_NONE AA_INDEX_NONE
#define AA_X_NAME 0x04000000 /* use executable name px */
#define AA_X_TABLE 0x08000000 /* use a specified name ->n# */

9
security/apparmor/include/perms.h
View File

@ -78,11 +78,20 @@ struct aa_perms {
u32 quiet; /* set only when ~allow | deny */
u32 hide; /* set only when ~allow | deny */
u32 xindex;
u32 tag; /* tag string index, if present */
u32 label; /* label string index, if present */
};
/*
* Indexes are broken into a 24 bit index and 8 bit flag.
* For the index to be valid there must be a value in the flag
*/
#define AA_INDEX_MASK 0x00ffffff
#define AA_INDEX_FLAG_MASK 0xff000000
#define AA_INDEX_NONE 0
#define ALL_PERMS_MASK 0xffffffff
extern struct aa_perms nullperms;
extern struct aa_perms allperms;

14
security/apparmor/lib.c
View File

@ -348,6 +348,13 @@ void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend)
accum->hide &= addend->hide & ~addend->allow;
accum->prompt |= addend->prompt & ~addend->allow & ~addend->deny;
accum->subtree |= addend->subtree & ~addend->deny;
if (!accum->xindex)
accum->xindex = addend->xindex;
if (!accum->tag)
accum->tag = addend->tag;
if (!accum->label)
accum->label = addend->label;
}
/**
@ -367,6 +374,13 @@ void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend)
accum->hide &= addend->hide & ~accum->allow;
accum->prompt |= addend->prompt & ~accum->allow & ~accum->deny;
accum->subtree &= addend->subtree & ~accum->deny;
if (!accum->xindex)
accum->xindex = addend->xindex;
if (!accum->tag)
accum->tag = addend->tag;
if (!accum->label)
accum->label = addend->label;
}
void aa_profile_match_label(struct aa_profile *profile, struct aa_label *label,