lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[AUDIT] break large execve argument logging into smaller messages

Browse Source 
execve arguments can be quite large.  There is no limit on the number of
arguments and a 4G limit on the size of an argument.

this patch prints those aruguments in bite sized pieces.  a userspace size
limitation of 8k was discovered so this keeps messages around 7.5k

single arguments larger than 7.5k in length are split into multiple records
and can be identified as aX[Y]=

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2008-01-07 14:31:58 -05:00
committed by Al Viro
parent e445deb593
commit de6bbd1d30
5 changed files with 196 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
kernel/audit.c
View File

@ -1349,6 +1349,21 @@ static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
skb_put(skb, slen + 2); /* don't include null terminator */
}
/**
* audit_string_contains_control - does a string need to be logged in hex
* @string - string to be checked
* @len - max length of the string to check
*/
int audit_string_contains_control(const char *string, size_t len)
{
const unsigned char *p;
for (p = string; p < (const unsigned char *)string + len && *p; p++) {
if (*p == '"' || *p < 0x21 || *p > 0x7f)
return 1;
}
return 0;
}
/**
* audit_log_n_untrustedstring - log a string that may contain random characters
* @ab: audit_buffer
@ -1363,19 +1378,13 @@ static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
* The caller specifies the number of characters in the string to log, which may
* or may not be the entire string.
*/
const char *audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
const char *string)
void audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
const char *string)
{
const unsigned char *p;
for (p = string; p < (const unsigned char *)string + len && *p; p++) {
if (*p == '"' || *p < 0x21 || *p > 0x7f) {
audit_log_hex(ab, string, len);
return string + len + 1;
}
}
audit_log_n_string(ab, len, string);
return p + 1;
if (audit_string_contains_control(string, len))
audit_log_hex(ab, string, len);
else
audit_log_n_string(ab, len, string);
}
/**
@ -1386,9 +1395,9 @@ const char *audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
* Same as audit_log_n_untrustedstring(), except that strlen is used to
* determine string length.
*/
const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
{
return audit_log_n_untrustedstring(ab, strlen(string), string);
audit_log_n_untrustedstring(ab, strlen(string), string);
}
/* This is a helper-function to print the escaped d_path */