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| author | Al Viro <viro@zeniv.linux.org.uk> | 2006-09-01 01:26:40 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2006-09-11 19:32:30 +0200 |
| commit | 55669bfa141b488be865341ed12e188967d11308 (patch) | |
| tree | efeec37a93f46c48937eb849c083da9a42ed3709 /kernel/auditsc.c | |
| parent | [PATCH] audit: more syscall classes added (diff) | |
| download | linux-55669bfa141b488be865341ed12e188967d11308.tar.xz linux-55669bfa141b488be865341ed12e188967d11308.zip | |
[PATCH] audit: AUDIT_PERM support
add support for AUDIT_PERM predicate
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/auditsc.c')
| -rw-r--r-- | kernel/auditsc.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c index efc1b74bebf3..1bd8827a0102 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -209,6 +209,54 @@ struct audit_context { #endif }; +#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) +static inline int open_arg(int flags, int mask) +{ + int n = ACC_MODE(flags); + if (flags & (O_TRUNC | O_CREAT)) + n |= AUDIT_PERM_WRITE; + return n & mask; +} + +static int audit_match_perm(struct audit_context *ctx, int mask) +{ + unsigned n = ctx->major; + switch (audit_classify_syscall(ctx->arch, n)) { + case 0: /* native */ + if ((mask & AUDIT_PERM_WRITE) && + audit_match_class(AUDIT_CLASS_WRITE, n)) + return 1; + if ((mask & AUDIT_PERM_READ) && + audit_match_class(AUDIT_CLASS_READ, n)) + return 1; + if ((mask & AUDIT_PERM_ATTR) && + audit_match_class(AUDIT_CLASS_CHATTR, n)) + return 1; + return 0; + case 1: /* 32bit on biarch */ + if ((mask & AUDIT_PERM_WRITE) && + audit_match_class(AUDIT_CLASS_WRITE_32, n)) + return 1; + if ((mask & AUDIT_PERM_READ) && + audit_match_class(AUDIT_CLASS_READ_32, n)) + return 1; + if ((mask & AUDIT_PERM_ATTR) && + audit_match_class(AUDIT_CLASS_CHATTR_32, n)) + return 1; + return 0; + case 2: /* open */ + return mask & ACC_MODE(ctx->argv[1]); + case 3: /* openat */ + return mask & ACC_MODE(ctx->argv[2]); + case 4: /* socketcall */ + return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); + case 5: /* execve */ + return mask & AUDIT_PERM_EXEC; + default: + return 0; + } +} + /* Determine if any context name data matches a rule's watch data */ /* Compare a task_struct with an audit_rule. Return 1 on match, 0 * otherwise. */ @@ -397,6 +445,9 @@ static int audit_filter_rules(struct task_struct *tsk, /* ignore this field for filtering */ result = 1; break; + case AUDIT_PERM: + result = audit_match_perm(ctx, f->val); + break; } if (!result) |