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core/exec-invoke: check size of read size

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Even though we do not use the read data, it is better to check the size
to prevent something spurious going.

Fixes CID#1612155.
This commit is contained in:
Yu Watanabe
2025-07-26 02:06:45 +09:00
parent 4d13e4dcbb
commit 1f4e9f6d60
1 changed files with 4 additions and 1 deletions
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5
src/core/exec-invoke.c
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@@ -2244,8 +2244,11 @@ static int setup_private_users_child(int unshare_ready_fd, const char *uid_map,
/* Wait until the parent unshared the user namespace */
uint64_t c;
if (read(unshare_ready_fd, &c, sizeof(c)) < 0)
ssize_t n = read(unshare_ready_fd, &c, sizeof(c));
if (n < 0)
return log_debug_errno(errno, "Failed to read from signaling eventfd: %m");
if (n != sizeof(c))
return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Short read from signaling eventfd.");
/* Disable the setgroups() system call in the child user namespace, for good, unless PrivateUsers=full
* and using the system service manager. */