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apparmor: Check buffer bounds when mapping permissions mask 

Don't read past the end of the buffer containing permissions
characters or write past the end of the destination string.

Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access")

Fixes: e53cfe6c7c ("apparmor: rework perm mapping to a slightly broader set")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
Tyler Hicks 2018-07-06 05:25:00 +00:00 committed by John Johansen
parent fb7d1bcf16
commit 7f3ebcf2b1
3 changed files with 17 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
security/apparmor/file.c
View File

@ -47,7 +47,8 @@ static void audit_file_mask(struct audit_buffer *ab, u32 mask)
{
char str[10];
aa_perm_mask_to_str(str, aa_file_perm_chrs, map_mask_to_chr_mask(mask));
aa_perm_mask_to_str(str, sizeof(str), aa_file_perm_chrs,
map_mask_to_chr_mask(mask));
audit_log_string(ab, str);
}

3
security/apparmor/include/perms.h
View File

@ -137,7 +137,8 @@ extern struct aa_perms allperms;
xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2)))
void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask);
void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
u32 mask);
void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
u32 mask);
void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,

17
security/apparmor/lib.c
View File

@ -198,15 +198,24 @@ const char *aa_file_perm_names[] = {
/**
* aa_perm_mask_to_str - convert a perm mask to its short string
* @str: character buffer to store string in (at least 10 characters)
* @str_size: size of the @str buffer
* @chrs: NUL-terminated character buffer of permission characters
* @mask: permission mask to convert
*/
void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask)
void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs, u32 mask)
{
unsigned int i, perm = 1;
size_t num_chrs = strlen(chrs);
for (i = 0; i < num_chrs; perm <<= 1, i++) {
if (mask & perm) {
/* Ensure that one byte is left for NUL-termination */
if (WARN_ON_ONCE(str_size <= 1))
break;
for (i = 0; i < 32; perm <<= 1, i++) {
if (mask & perm)
*str++ = chrs[i];
str_size--;
}
}
*str = '\0';
}
@ -236,7 +245,7 @@ void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
audit_log_format(ab, "\"");
if ((mask & chrsmask) && chrs) {
aa_perm_mask_to_str(str, chrs, mask & chrsmask);
aa_perm_mask_to_str(str, sizeof(str), chrs, mask & chrsmask);
mask &= ~chrsmask;
audit_log_format(ab, "%s", str);
if (mask & namesmask)