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Christian Marangi 5a5d3a7e42 PM / devfreq: Fix buffer overflow in trans_stat_show 
commit 08e23d05fa6dc4fc13da0ccf09defdd4bbc92ff4 upstream.

Fix buffer overflow in trans_stat_show().

Convert simple snprintf to the more secure scnprintf with size of
PAGE_SIZE.

Add condition checking if we are exceeding PAGE_SIZE and exit early from
loop. Also add at the end a warning that we exceeded PAGE_SIZE and that
stats is disabled.

Return -EFBIG in the case where we don't have enough space to write the
full transition table.

Also document in the ABI that this function can return -EFBIG error.

Link: https://lore.kernel.org/all/20231024183016.14648-2-ansuelsmth@gmail.com/
Cc: stable@vger.kernel.org
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218041
Fixes: e552bbaf5b98 ("PM / devfreq: Add sysfs node for representing frequency transition information.")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-11-19 11:32:38 +01:00
..
ABI PM / devfreq: Fix buffer overflow in trans_stat_show 2024-11-19 11:32:38 +01:00
accounting Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
admin-guide x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled 2024-11-19 09:22:43 +01:00
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block block: introduce zone_write_granularity limit 2024-11-19 09:22:16 +01:00
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networking net: change accept_ra_min_rtr_lft to affect all RA lifetimes 2024-11-08 11:25:47 +01:00
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process overflow: Implement size_t saturating arithmetic helpers 2024-11-18 11:42:47 +01:00
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sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-11-18 12:13:17 +01:00
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x86 x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-11-19 09:22:40 +01:00
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