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From 10bea037a2ad82616b3698d07d07d287481e1bed Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Wed, 6 May 2015 14:04:42 +0200
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Subject: [ABRT PATCH] daemon: harden against race conditions in DELETE
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There is a race between checking dump dir accessibility and deleting it
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in abrt-server.
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Related: #1214457.
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Signed-off-by: Jakub Filak <jfilak@redhat.com>
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---
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src/daemon/abrt-server.c | 21 +++++++++++++++++++--
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1 file changed, 19 insertions(+), 2 deletions(-)
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diff --git a/src/daemon/abrt-server.c b/src/daemon/abrt-server.c
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index 1030461..130c24a 100644
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--- a/src/daemon/abrt-server.c
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+++ b/src/daemon/abrt-server.c
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@@ -91,8 +91,16 @@ static int delete_path(const char *dump_dir_name)
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error_msg("Problem directory '%s' isn't owned by root:abrt or others are not restricted from access", dump_dir_name);
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return 400; /* */
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}
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- if (!dump_dir_accessible_by_uid(dump_dir_name, client_uid))
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+
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+ int dir_fd = dd_openfd(dump_dir_name);
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+ if (dir_fd < 0)
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+ {
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+ perror_msg("Can't open problem directory '%s'", dump_dir_name);
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+ return 400;
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+ }
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+ if (!fdump_dir_accessible_by_uid(dir_fd, client_uid))
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{
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+ close(dir_fd);
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if (errno == ENOTDIR)
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{
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error_msg("Path '%s' isn't problem directory", dump_dir_name);
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@@ -102,7 +110,16 @@ static int delete_path(const char *dump_dir_name)
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return 403; /* Forbidden */
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}
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- delete_dump_dir(dump_dir_name);
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+ struct dump_dir *dd = dd_fdopendir(dir_fd, dump_dir_name, /*flags:*/ 0);
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+ if (dd)
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+ {
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+ if (dd_delete(dd) != 0)
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+ {
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+ error_msg("Failed to delete problem directory '%s'", dump_dir_name);
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+ dd_close(dd);
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+ return 400;
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+ }
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+ }
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return 0; /* success */
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}
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--
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1.8.3.1
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