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binfmt: modernize code a bit

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Let's just copy out the bit of the string we need, and let's make sure
we refuse rules called "status" and "register", since those are special
files in binfmt_misc's file system.
This commit is contained in:
Lennart Poettering 2020-04-23 16:27:46 +02:00
parent 0282c0285a
commit f3670df13e
1 changed files with 6 additions and 7 deletions
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13
src/binfmt/binfmt.c
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@ -32,18 +32,17 @@ static int delete_rule(const char *rule) {
assert(rule);
assert(rule[0]);
x = strdup(rule);
e = strchrnul(rule + 1, rule[0]);
x = strndup(rule + 1, e - rule - 1);
if (!x)
return log_oom();
e = strchrnul(x+1, x[0]);
*e = 0;
if (!filename_is_valid(x + 1))
if (!filename_is_valid(x) ||
STR_IN_SET(x, "register", "status"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Rule file name '%s' is not valid, refusing.", x + 1);
"Rule file name '%s' is not valid, refusing.", x);
fn = path_join("/proc/sys/fs/binfmt_misc", x+1);
fn = path_join("/proc/sys/fs/binfmt_misc", x);
if (!fn)
return log_oom();