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Decode mountinfo octal escapes during Bcachefs device dereferencing

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This commit is contained in:
Andrea Mazzoleni 2026-08-14 09:54:28 +02:00
parent 39e55d3002
commit 180f7edc2f
1 changed files with 32 additions and 0 deletions
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32
cmdline/unixapp.c
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@ -722,6 +722,36 @@ bail:
return -1;
}
/**
* Decodes octal escape sequences (\ooo) in place.
*
* In /proc/self/mountinfo, special characters like spaces, tabs, newlines,
* and backslashes are encoded as 3-digit octal escape sequences (e.g. \040 for space).
* Decoding is performed in place because the decoded character is always
* shorter than the 4-byte escape sequence.
*/
static void unescape_mount(char* s)
{
char* r = s;
char* w = s;
while (*r != 0) {
if (r[0] == '\\'
&& r[1] >= '0' && r[1] <= '7'
&& r[2] >= '0' && r[2] <= '7'
&& r[3] >= '0' && r[3] <= '7') {
*w = (char)(((r[1] - '0') << 6) | ((r[2] - '0') << 3) | (r[3] - '0'));
++w;
r += 4;
} else {
*w = *r;
++w;
++r;
}
}
*w = 0;
}
static int devdereference_bcachefs(uint64_t device, const char* dir, tommy_list* devlist)
{
char resolved[PATH_MAX];
@ -784,6 +814,7 @@ static int devdereference_bcachefs(uint64_t device, const char* dir, tommy_list*
continue;
/* mount point must contain the directory */
unescape_mount(id_map[4]);
const char* mp = id_map[4];
size_t mp_len = strlen(mp);
if (strncmp(resolved, mp, mp_len) != 0)
@ -799,6 +830,7 @@ static int devdereference_bcachefs(uint64_t device, const char* dir, tommy_list*
/* keep the longest (innermost) match */
if (mp_len > best_len) {
best_len = mp_len;
unescape_mount(fs_map[1]);
pathcpy(device_list, sizeof(device_list), fs_map[1]);
}
}