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alloc_tag: Tighten file permissions on /proc/allocinfo

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The /proc/allocinfo file exposes a tremendous about of information about
kernel build details, memory allocations (obviously), and potentially even
image layout (due to ordering).  As this is intended to be consumed by
system owners (like /proc/slabinfo), use the same file permissions as
there: 0400.

Link: https://lkml.kernel.org/r/20240425200844.work.184-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kees Cook 2024-04-25 13:08:50 -07:00 committed by Andrew Morton
parent 2c321f3f70
commit e13106952f
1 changed files with 1 additions and 1 deletions
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lib/alloc_tag.c
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@ -129,7 +129,7 @@ size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sl
static void __init procfs_init(void)
{
proc_create_seq("allocinfo", 0444, NULL, &allocinfo_seq_op);
proc_create_seq("allocinfo", 0400, NULL, &allocinfo_seq_op);
}
static bool alloc_tag_module_unload(struct codetag_type *cttype,