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xz, xzdec: Capsicum sandbox: Fix incorrect use of cap_rights_clear()

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cap_rights_clear() with no additional arguments acts as a no-op, so
instead of removing all capability rights from STDIN_FILENO, the same
rights were allowed for STDIN_FILENO as were allowed for src_fd.

Fixes: a0eecc235d3b ("xz: Make Capsicum sandbox more strict with stdin and stdout.")
(The commit message says "stdout". It should have said "stderr".)

(cherry picked from commit 5cc2e479eb447a444f5ab005fc36b7f275c75eb5)
This commit is contained in:
Guillaume Outters 2025-04-25 02:55:08 +02:00 committed by Lasse Collin
parent 2e918d09ad
commit 00034e2506
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GPG Key ID: 38EE757D69184620
2 changed files with 2 additions and 2 deletions
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2
src/xz/sandbox.c
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@ -319,7 +319,7 @@ sandbox_enable_strict_if_allowed(
// If not reading from stdin, remove all capabilities from it.
if (src_fd != STDIN_FILENO && cap_rights_limit(
STDIN_FILENO, cap_rights_clear(&rights)))
STDIN_FILENO, cap_rights_init(&rights)))
goto error;
if (cap_rights_limit(STDOUT_FILENO, cap_rights_init(&rights,

2
src/xzdec/xzdec.c
View File

@ -316,7 +316,7 @@ sandbox_enter(int src_fd)
// If not reading from stdin, remove all capabilities from it.
if (src_fd != STDIN_FILENO && cap_rights_limit(
STDIN_FILENO, cap_rights_clear(&rights)))
STDIN_FILENO, cap_rights_init(&rights)))
goto error;
if (cap_rights_limit(STDOUT_FILENO, cap_rights_init(&rights,